Enterprise RAID Controller Recovery

HPE ProLiant Smart Array Data Recovery

We recover data from failed HPE ProLiant servers by extracting member drives, imaging them at sector level through SAS HBAs, and reconstructing the array from HP's proprietary RIS metadata at the start of each drive. P408i-a, P440ar, E208i-a, MR416i-p, and legacy P420i/P440ar controllers. Free evaluation. No data = no charge.

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Author01/17

Written by

Louis Rossmann

Founder & Chief Technician

Updated June 2026

12 min read

Overview02/17

How Smart Array Controllers Fail and How We Recover Them

Smart Array controllers fail through dead cards, corrupt firmware, dead FBWC batteries, or too many degraded members. The array geometry lives in HP's Reserved Information Sector on each drive, not in the card, so it survives controller death. We image every member and reconstruct the array offline without the original controller.

HPE ProLiant servers use Smart Array RAID controllers to manage arrays of SAS or SATA drives. When the controller fails, firmware corrupts, the Flash-Backed Write Cache (FBWC) battery dies, or enough member drives degrade to exceed parity tolerance, the logical drives go offline and the server cannot boot. Recovery requires extracting every member drive, imaging them independently through SAS HBAs at sector level, parsing HP's proprietary RIS metadata from the reserved sectors at the start of each drive, and reconstructing the array offline without relying on the original controller.

Smart Array controllers differ from Dell PERC and Broadcom MegaRAID in how they store on-disk metadata. HP writes a Reserved Information Sector (RIS) to raw reserved physical sectors at the start of each member drive, below any OS partitioning scheme. This reserved region contains the drive ordering, stripe size (HP defaults to 256KB), parity rotation scheme, and logical drive boundaries. Standard Linux mdadm or generic RAID destriping software cannot parse this format. We parse it from the drive images during offline reconstruction.

Smart Array Controller Generations03/17

Smart Array Controller Generations

HPE has shipped Gen8 BBWC P-series, Gen9 and Gen10 FBWC P-series like the P440ar and P408i-a, the cacheless E208i-a, and the Gen11 Broadcom MR416i-p. Each family differs in cache backup and on-disk metadata format, which sets the recovery approach. The geometry parses from the drives regardless of which card created the array.

HPE has shipped multiple controller families across ProLiant generations. Each has a different cache architecture, interface capabilities, and failure characteristics that affect the recovery approach.

Controller	Interface	Cache	ProLiant Generations	Recovery Notes
P408i-a SR Gen10	12Gb/s SAS	2GB FBWC (flash-backed)	DL360 Gen10, DL380 Gen10, ML350 Gen10	Standard start-of-disk RIS metadata. FBWC survives power loss via supercapacitor flush.
P440ar Gen9	12Gb/s SAS	2GB FBWC (flash-backed)	DL360 Gen9, DL380 Gen9, ML350 Gen9	POST Error 313 risk. Pre-v6.60 firmware sets persistent NVRAM disable flag on battery failure.
E208i-a SR Gen10	12Gb/s SAS (Mixed Mode)	No write cache	DL325 Gen10, DL360 Gen10 (entry)	No cache trapping risk. Software RAID mode (HBA mode) bypasses controller metadata entirely.
MR416i-p Gen11	PCIe Gen4 Tri-Mode (SAS/SATA/NVMe)	8GB cache (supercapacitor-backed)	DL360 Gen11, DL380 Gen11, DL380a Gen11	Broadcom MegaRAID architecture. SPDM hardware root of trust limits chip-off on NVMe SEDs.
P420i / P440ar (Legacy)	6Gb/s or 12Gb/s SAS	512MB-2GB BBWC or FBWC	DL380p Gen8, DL360p Gen8, ML350p Gen8	Older BBWC uses battery; battery degradation is the primary cache failure mode on Gen8 servers.

RIS Metadata04/17

The Reserved Information Sector: HP's Proprietary RAID Metadata

HP's Reserved Information Sector (RIS) sits in a reserved area at the start of each member drive, holding drive order, the 256KB default stripe, parity rotation, and logical drive boundaries. This is not the SNIA DDF trailing-sector format Dell PERC and LSI use. Because the geometry sits on the disks, we reconstruct the array without the original card.

Every drive managed by an HP Smart Array controller carries a Reserved Information Sector (RIS) written to raw reserved physical sectors at the start of the drive. This region sits below the OS partition abstraction; it is not a GPT partition and is not listed in standard partition management tools. The controller reads it at boot to determine which drives belong to which logical drive, the stripe size, RAID level, parity rotation pattern, and the order in which drives should be assembled.

When drives are removed from an HP ProLiant and inserted into a different server or connected to a standard HBA, the operating system sees only the partitions the logical drive carried; the RIS itself is never exposed as a partition. Writing to the start of a member drive, repartitioning it, or letting a foreign controller initialize it can overwrite the RIS and corrupt the RAID configuration. During recovery, we image each member at sector level and read the RIS from the images without modifying it.

The division of labor matters here. The imaging hardware reads and images the metadata region; it does not assemble the array. Data Extractor Express RAID Edition, the ACE Lab array-reconstruction software running on the PC-3000 Express, performs the virtual reassembly: it parses the imaged RIS descriptor, fixes member order, confirms stripe size and parity rotation, and destripes the static images into a single logical volume.

Stripe Size: HP Smart Array defaults to 256KB stripe size, four times larger than Dell PERC's default of 64KB. Misidentifying the stripe size during reconstruction produces apparently valid but irreversibly scrambled output. The RIS metadata records the exact stripe size the administrator selected during array creation.
Parity Rotation: HP implements left-symmetric parity rotation by default for RAID 5 and RAID 6. The metadata specifies the rotation algorithm and starting position. Using the wrong rotation pattern during reconstruction produces silently corrupted data that passes surface-level filesystem checks but contains byte-level errors in file contents.
Drive Ordering: The metadata maps physical slot numbers to logical member positions. If an administrator moved drives between bays during the server's lifetime, the physical-to-logical mapping may not follow sequential slot order. The RIS metadata records the actual mapping regardless of physical position.
Two Stages: Hardware Imaging Then Software Reconstruction: Reading the RIS descriptor and reassembling the array are two separate stages handled by two separate tools. In the hardware stage, we image and extract the raw sectors of each member drive through SAS HBAs, including the reserved start-of-disk RIS region. That is a firmware-level sector-extraction step performed against the physical drive. In the software stage, Data Extractor Express RAID Edition, the ACE Lab array-reconstruction software that runs on the PC-3000 Express, parses the on-disk RIS descriptor from the static member images, maps drive order, detects the 256KB HP default stripe and left-symmetric parity rotation, virtually reassembles the array geometry, and destripes. Every software step runs against the image files, never against the live drives. Because the geometry lives on the disks, the original HP Smart Array controller is not required for the reconstruction.

What Is HP Advanced Data Guarding and How Does ADG Affect Recovery?

Advanced Data Guarding (ADG) is HP's brand name for RAID 6: dual distributed parity with two independent syndromes, P and Q, spread across every member drive. SSACLI and the Smart Storage Administrator label these volumes "RAID 6 (ADG)," and third-party tooling that reads the geometry simply reports them as RAID 6.

ADG is not a dedicated parity drive; a single fixed parity disk would be RAID 4. Both the P and Q syndromes rotate across all members, exactly as in standard RAID 6.

The parity algebra is not exotic. Standard RAID 6 Q-parity already uses Galois-field Reed-Solomon math, and ADG is that same dual-parity scheme under an HP marketing label, not a non-standard encoding that a RAID 6 destriper cannot read.

The recovery-relevant unknown is geometry, not algebra: stripe size, member order, and the rotation pattern for both the P and Q syndromes. On Gen8 to Gen10 P-series controllers that geometry is read from the HP RIS in reserved sectors at the start of each drive, the same place RAID 5 geometry lives, not from any property of the parity math.

ADG tolerates two simultaneous member failures where RAID 5 tolerates one. That extra redundancy changes the collapse point but does not remove it.

A degraded ADG volume running on one surviving parity syndrome behaves like a degraded RAID 5 during a rebuild: a third member failure, or a latent unreadable sector surfacing on a survivor under the sustained sequential read load of a rebuild, takes the logical drive offline. The same rule applies as for RAID 5. Image every member offline before any rebuild rather than letting the controller read aging same-batch survivors at full tilt.

FBWC & BBWC Cache05/17

FBWC and BBWC Cache Failure Modes

BBWC on Gen8 holds the write cache on a lithium-ion battery; FBWC on Gen9 and later flushes DRAM to NAND through supercapacitors. When the battery or supercapacitor fails during a power event, writes acknowledged to the host never reach disk and the on-disk metadata goes stale. We extract those trapped writes from the FBWC module during recovery.

HP Smart Array controllers use write-back caching to accelerate I/O. Writes are acknowledged to the host OS before being committed to disk. The uncommitted data sits in volatile cache memory protected by either a battery (BBWC on Gen8 and earlier) or supercapacitors with flash backup (FBWC on Gen9 and later). Cache failure is the most common source of data discrepancy between what the OS expects and what actually resides on the member drives.

BBWC (Battery-Backed Write Cache)

Gen8 and earlier P-series controllers (P420i, P222, P410i) use a lithium-ion battery module to maintain the DRAM write cache during power loss. The battery has a limited charge cycle lifespan, typically 3-4 years. Once the battery can no longer hold charge, the controller disables write-back caching and switches to write-through mode. If the battery fails while the cache contains unflushed writes and the server loses power simultaneously, those writes are lost.

Failure indicator: iLO event log shows "Cache battery charge below threshold." POST warning appears but server continues booting.
Data risk: Writes acknowledged to the OS but not committed to disk are lost if power fails during the battery degradation window.

FBWC (Flash-Backed Write Cache)

Gen9 and Gen10 P-series controllers (P440ar, P408i-a, P816i-a) replaced the battery with supercapacitors and a NAND flash module. During power loss, the supercapacitors provide enough energy to flush the DRAM cache contents to the flash module. On next boot, the controller reads the flash module and replays the cached writes to disk before the array comes online.

Failure indicator: POST Error 313 on P440ar (Smart Storage Battery failure). The controller disables the cache permanently until the battery module is replaced.
Data risk: If the server lost power while the FBWC contained dirty writes and the supercapacitor did not have enough charge to complete the flush, unflushed writes are trapped in the flash module. The array metadata on disk is stale.

Post Error 31306/17

POST Error 313: Smart Storage Battery Failure

POST Error 313 fires when the HPE Smart Storage Battery cannot guarantee a cache flush, prompting the P440ar to disable write-back caching. On older firmware, a persistent NVRAM flag survives battery replacement. Swapping the battery clears the error but cannot replay trapped writes; we extract those from the FBWC module directly.

POST Error 313 is specific to HP Gen9 servers with P440ar controllers. The error fires when the Smart Storage Battery can no longer maintain sufficient voltage to guarantee a cache flush during power loss. The controller permanently disables write-back caching to protect data integrity.

The complication arises with P440ar firmware versions earlier than v6.60. On these older firmware builds, the battery failure sets a persistent flag in the controller's NVRAM that survives battery replacement. Even after installing a new HPE 96W Smart Storage Battery (P/N 875241-B21 or 871264-001), the controller may refuse to re-enable write-back caching because the NVRAM flag is still set. The server continues running in write-through mode, but if the original power event already caused unflushed writes, the damage is done.

Replacing the battery does not recover trapped cache data. If the P440ar lost power while the FBWC held dirty writes, the battery replacement clears the POST error but does not replay the cached writes to disk. The on-disk array metadata reflects the pre-crash state; any writes that were acknowledged to the OS but not flushed are missing. Running consumer recovery software against the logical volume in this state captures the outdated stripe state, resulting in corrupted databases and virtual machines.

Our recovery protocol for Error 313 scenarios involves powering the FBWC module independently on the 0.02μm ULPA laminar flow bench and reading the pending writes directly from the flash-backed storage. We then reconcile those writes with the member drive images to produce a consistent array snapshot that reflects the state the OS expected before the crash.

Gen11 MR416i-p07/17

Gen11 MR416i-p: Broadcom Tri-Mode and SPDM Limitations

The MR416i-p is a Broadcom MegaRAID controller, not a traditional HP Smart Array. It supports PCIe Gen4 Tri-Mode interfaces managing SAS, SATA, and NVMe simultaneously. It reads Broadcom DDF metadata at end-of-disk, not HP's start-of-disk RIS. When NVMe Self-Encrypting Drives are paired with the SPDM hardware root of trust, chip-off recovery is not possible.

HPE Gen11 ProLiant servers (DL360 Gen11, DL380 Gen11) replaced the traditional Smart Array controller with the MR416i-p, a Broadcom MegaRAID controller running HPE-branded firmware. The MR416i-p supports PCIe Gen4 Tri-Mode operation, meaning it can manage SAS, SATA, and NVMe drives simultaneously on the same backplane. This is a fundamental architectural change from the P-series controllers.

The MR416i-p uses the Broadcom on-disk metadata format (DDF-based), not HP's RIS format. Recovery tools that parse HP Smart Array RIS metadata cannot read MR416i-p arrays. These controllers follow the standard SNIA DDF reconstruction path instead.

SPDM and Self-Encrypting Drives: The MR416i-p implements the DMTF Security Protection Data Model (SPDM) to establish a Hardware Root of Trust (HWRoT) with the iLO 6 baseboard management controller. When Self-Encrypting Drives (SEDs) are connected via the NVMe Tri-Mode interface, cryptographic keys are bound to this hardware trust chain. Direct NAND chip-off from these drives is not possible because the data encryption key is tied to the specific controller and iLO pairing. Recovery of physically failed NVMe SEDs requires component-level board repair of the original controller to restore the key chain.

For MR416i-p arrays using non-SED drives (standard SAS or SATA without hardware encryption), the recovery process follows standard Broadcom MegaRAID methodology: extract drives, image through SAS HBAs, parse the DDF metadata, and reconstruct the array offline. The Tri-Mode interface does not affect the recovery process once drives are removed from the chassis and connected directly to an HBA.

The end-of-disk DDF the MR416i-p writes is the same SNIA Disk Data Format structure that stock LSI/Broadcom MegaRAID controllers and Dell PERC write on the trailing sectors of each member. That cross-vendor identity has a direct workflow consequence.

A parser configured only for HP P-series geometry looks for start-of-disk RIS metadata and finds nothing on a Gen11 array, which is why an HP-only shop reports the drives unrecoverable when the geometry is intact at the other end of the LBA range. The same DDF parsing and offline reconstruction path used for an LSI MegaRAID or Dell PERC array applies unchanged to an MR416i-p array once the members are imaged; the geometry parses from the trailing-sector DDF descriptor regardless of the HPE firmware badge on the original card.

HP SmartCache08/17

What Happens When an HP SmartCache SSD Fails Mid-Write?

HP SmartCache is a physical SSD tier sitting in front of the spinning array, distinct from the controller's FBWC DRAM. In write-back mode, if the cache SSD fails mid-write, writes acknowledged to the host stay trapped on the SSD and never reach the spinning members, leaving stale blocks and filesystem corruption. Recovery images the cache SSD and overlays the dirty blocks onto the reconstructed backing array.

SmartCache is not the same thing as FBWC, and conflating the two leads to the wrong recovery plan. SmartCache uses one or more independent physical SSDs as a caching medium in front of the spinning hard drive array, accelerating reads and writes against the slower backing logical drive.

FBWC is DRAM located on the Smart Array controller card itself, flushed to onboard NAND through a supercapacitor during a power loss event. SmartCache lives on separate SSD hardware; FBWC lives on the controller.

The failure that costs data is a cache SSD dying mid-write while SmartCache operates in write-back mode. In write-back mode the host OS receives an acknowledgment as soon as the write lands on the cache SSD, before that data is destaged to the spinning members.

If the cache SSD fails before destaging completes, those acknowledged writes are trapped on the dead SSD and never reach the backing array. The spinning members hold stale blocks while the OS believes the writes committed, which surfaces as filesystem corruption: truncated journals, dangling metadata, and databases whose last transactions vanished.

SmartCache pairing matters. SmartCache metadata links the specific cache SSD volume to its backing logical drive. If that pairing is lost, the backing logical drive may refuse to mount or mount with logically damaged data. We do not cite a sector offset for this metadata because the on-disk location is not something we can verify from published sources.

Recovery is a two-image overlay. We image the failed cache SSD at sector level, including any dirty blocks that never destaged, and separately reconstruct the backing array image from the member drives by parsing the RIS metadata.

We then identify the uncommitted blocks on the cache SSD image and overlay them onto the reconstructed backing-array image so the recovered volume reflects the state the OS expected at the moment of failure, not the stale state frozen on the spinning members. This is the opposite of an FBWC recovery, where the trapped writes sit in NAND on the controller card rather than on a separate SSD tier.

RAID Rebuild Risks09/17

RAID Rebuild Risks on Degraded Smart Array Controllers

Rebuilding a degraded Smart Array RAID 5 risks total collapse. The rebuild reads every sector of every surviving member, and consumer-class drives carry a worst-case spec of one Unrecoverable Read Error per 12.5 TB read. A URE mid-rebuild on a P-series controller can drop a second drive and take the array offline. Image every member offline before any rebuild.

When a Smart Array controller reports a degraded RAID 5 array and prompts "Ready for Rebuild," initiating the rebuild risks destroying data that could otherwise be recovered. The rebuild process reads every sector of every surviving member drive to regenerate the missing parity or data blocks onto a hot spare.

The surviving drives are already stressed. If one drive failed due to mechanical degradation (bearing wear, head instability), the remaining drives in the same server have similar runtime hours. They are statistically likely to develop Unrecoverable Read Errors (UREs) under sustained sequential load.
A single URE halts the rebuild. When the controller encounters a read error on a surviving member during parity regeneration, it drops that drive from the array. A RAID 5 array that was already degraded by one drive is now missing two drives, which exceeds the single-parity tolerance. The logical drive goes offline.
The rebuild partially overwrites parity data. Before the second failure halts the process, the controller has already written new parity blocks to the hot spare. The original parity data on the failed drive is needed to reconstruct the missing data, but the hot spare now contains partial parity from the incomplete rebuild. The original stripe map is no longer recoverable from the parity alone.

Power down the server. Do not initiate a rebuild on a degraded array. Image all member drives offline with write-blocking hardware before attempting any reconstruction. We recover degraded arrays by working from drive images, never from live arrays where a rebuild might trigger cascading failures.

Methodology10/17

Recovery Methodology for ProLiant Smart Array Servers

1. Controller and Array Evaluation

We identify the Smart Array controller model, firmware version, RAID level, number of logical drives, and current controller status (POST errors, cache state, drive bay status). If the iLO management interface is accessible, we export the Smart Storage Administrator configuration and event log before extracting drives. If the server is non-functional, we extract the configuration from the RIS metadata after imaging.

2. Drive Extraction and Slot Documentation

Every drive is labeled by bay number, model, serial number, and firmware revision before removal. Smart Array controllers map drives to logical groups by physical bay position. If the bay mapping is lost, reconstruction requires testing all possible member permutations against the RIS metadata on each drive to identify the correct assembly order.

3. Sector-Level SAS Imaging

Each drive is connected to our imaging workstation through SAS HBAs and imaged across the full LBA range, including the reserved start-of-disk RIS region. Enterprise SAS 10K/15K drives average 150-200MB/s throughput. Drives reporting SMART threshold warnings are imaged with adaptive retry parameters and selective head maps. Mechanically failed SAS drives receive donor head swaps on the 0.02μm ULPA laminar flow bench before imaging.

4. Metadata Parsing and Array Reconstruction

We read the RIS from each member drive image to extract stripe size, parity rotation, drive ordering, and logical drive boundaries. For P-series controllers this parsing runs against the start-of-disk RIS descriptor. For MR416i-p controllers, the reconstruction parses SNIA DDF metadata from the trailing sectors instead. Parity data from surviving members reconstructs any unreadable sectors from failed drives.

The imaging hardware and the reconstruction software are distinct. The imaging stage reads the raw sectors of each member at sector level, including the start-of-disk RIS region. Data Extractor Express RAID Edition then reconstructs the array geometry virtually against those image files: it maps member order, applies the 256KB stripe and left-symmetric parity rotation read from the descriptor, and destripes.

The reassembly always runs against the static images, never against the live member drives, so a rebuild can never be triggered by accident.

At the operating-system level, modern HP Smart Array controllers are driven by the Linux hpsa SCSI driver, which supplanted the older cciss block driver used by earlier Smart Array generations. That detail matters only for how a live host enumerates the controller; the offline reconstruction works from the drive images regardless of which driver the original server used.

5. Filesystem Extraction and Delivery

The reconstructed logical drive is mounted read-only. Common filesystems on ProLiant servers include NTFS/ReFS (Windows Server), VMFS (for VMware ESXi datastores), ext4/XFS (Linux), and Hyper-V .vhdx files. We extract the target data, verify file integrity against the customer's priority list, and deliver on encrypted media.

Pricing11/17

ProLiant Smart Array Recovery Pricing

Smart Array recovery follows the same transparent pricing model as every other service: per-drive imaging based on each drive's condition, plus a reconstruction fee per logical drive. No data recovered means no charge.

Service Tier	Price Range (Per Drive)	Description
Logical / Firmware Imaging	$250-$900	Drives with firmware corruption, SMART threshold warnings, or cache desynchronization from Error 313 events. Most healthy SAS drives from ProLiant arrays fall in this tier.
Mechanical (Head Swap / Motor)	$1,200–$1,50050% deposit	Donor SAS heads matched by model, firmware revision, head count, and preamp version. Required for SAS drives with mechanical failure in ProLiant chassis.
Array Reconstruction	Calculated feeper logical drive	RIS metadata parsing, Smart Array or MegaRAID reconstruction, parity recalculation, and filesystem extraction. One fee per logical drive group.

No Data = No Charge: If we recover nothing from your ProLiant array, you owe nothing. Free evaluation, no obligation.

Metadata Format History12/17

Where Smart Array Geometry Actually Lives Across Three Generations

Where HP's on-disk RAID metadata lives, and the format it uses, depends on the controller generation. Recovery methodology depends on knowing which generation you are working with, because the parser you point at the drive images has to look in the right place.

Controller Family	Metadata Location	Format	Offline Parser
Compaq Smart Array (5300, 6400, P600, MSA1000)	Reserved Information Sector at start of LBA	Proprietary RIS block, replicated across members	Manual hex parsing of the RIS block against the raw drive image
Smart Array Gen8-Gen10 P-series (P410, P420, P440ar, P408i-a, P822, P816i-a)	Reserved Information Sector at start of LBA, below any partition table	HP proprietary descriptor: stripe size, parity rotation, drive UUID, member order	RIS descriptor parsing against the raw member images
Gen11 MR416i-p (Broadcom MegaRAID rebadged with HPE firmware)	End-of-disk reserved area, not start-of-disk RIS sectors	Broadcom Disk Data Format (DDF) per SNIA spec	Standard SNIA DDF parsing of the trailing sectors, not HP RIS parsing

The practical consequence: a recovery shop that points the HP Smart Array parser at a Gen11 DL380 will find no valid metadata and report the array unrecoverable. The drives are fine; the parser is wrong. The original HP controller is not required for any of these three generations. Geometry parses from the drive images on the workstation.

URE Math13/17

What Is the URE Risk When Rebuilding RAID 5 on HP P-series?

Enterprise SAS drives carry a worst-case spec of one non-recoverable read error per 10¹⁵ bits, roughly one URE per 125 TB read. That is a warranty floor, not a schedule: most drives read far past it clean. Rebuilding a degraded RAID 5 across eight 10 TB drives forces 70 TB of sustained reads across aging survivors, which raises the chance of hitting a latent unreadable sector, though the dominant real-world risk is mechanical. On HP Smart Array P-series and E-series a URE mid-rebuild aborts the rebuild and drops the logical drive offline; newer HPE MR-series controllers puncture the stripe instead.

Enterprise SAS drives quote a non-recoverable read error rate of approximately one URE per 10¹⁵ bits, roughly one URE per 125 TB read. The HP Smart Array controller does not get an exception to this number. When a degraded RAID 5 enters Interim Recovery Mode and the operator inserts a replacement drive, the controller must read every sector of every surviving member to regenerate the missing data.

The binomial complement gives a worst-case upper bound on hitting at least one URE during a read of N bits: P(URE) = 1 minus (1 minus E) raised to the N, where E is the per-bit error rate (approximately 10^-15 for enterprise SAS). Treat the output as a ceiling, not an expected rate, because field data shows real fleet drives read well past the spec without an error.

Worked example. Eight 10 TB SAS drives in RAID 5 with one drive failed. The rebuild reads 70 TB across the seven survivors, which is roughly 5.6 times 10¹⁴ bits. Against a worst-case NRRE of 10^-15, the upper bound on P(URE) is near 42 percent, but the more common real-world failure on the bench is a same-batch survivor dying mechanically under the sustained read load.

Push the array to RAID 6 with twelve 16 TB drives and the rebuild read budget more than doubles; the upper bound climbs with it.

When the Smart Array controller hits a URE during rebuild, it stops. The controller marks the surviving drive that emitted the read error as failed, drops the logical drive offline with POST Error 1784 or 1786, and writes a failure flag to the metadata of the affected member. The array is now down two drives. RAID 5 single parity tolerance is exceeded. The hot spare contains partial parity from the aborted rebuild, which contaminates the stripe map.

The forensic imperative is unambiguous: never let the HP controller run a rebuild on an array that is candidate for recovery. Image every member offline with multipass sector-level imaging, parse the RIS against the static images, and reconstruct the array in software with Data Extractor Express RAID Edition. UREs encountered during imaging can be retried, mapped, and worked around; UREs encountered mid-rebuild crash the array.

POST Code Triage14/17

What Do HP Smart Array POST Codes Mean?

Smart Array Option ROM emits a specific POST code for each metadata-level event. POST 1779 fires when a failed drive reappears; 1785 when the controller cannot assemble a valid geometry; 1786 when fault tolerance is compromised; 1727 when conflicting metadata suggests an improper migration. Most are recoverable if no one presses a key.

The Smart Array Option ROM emits a specific POST code for each metadata-level event. Most of these are recoverable if no one presses a key. The codes below cover the events that frequently land servers in our queue.

POST 1779: Replacement drive(s) detected or previously failed drive(s) now appear operational: The controller saw a drive it previously marked failed, or a raw drive inserted while power was off. POST halts at an F1/F2 prompt. F1 disables the logical drives. F2 accepts the configuration and brings the array online; on a still-degraded RAID 5 this can initiate background parity calculations that overwrite recoverable user data. The safe action with data at stake is to leave the prompt, power down, and image the drives.
POST 1785: Drive Array Not Configured: The controller queried the members but could not assemble a valid geometry. Either the RIS is corrupt on enough members, or too many member drives are missing or have failed simultaneously (two dead in a RAID 5, both sides of a RAID 1 mirror). The array is reconstructable offline from drive images.
POST 1786: Drive Array Recovery Needed: The logical drive is degraded. A member is failed or missing and fault tolerance is compromised. Operating in this state with the controller online risks a secondary URE crashing the entire array. Treat 1786 as a stop-and-image event, not as a prompt to install a hot spare.
POST 1727: New (or previously failed) logical drive attachment detected: The controller detected a logical array that was not present on the previous boot, or found conflicting metadata suggesting an improper migration between controllers. Accepting the auto-config offer can rewrite the RIS on the new members. Do not press a key. Pull the drives and image them.

SSACLI Drive States15/17

What Do SSACLI Drive and Logical Drive States Mean for Recovery?

SSACLI (formerly hpssacli) state output tells you whether to keep working or power down and image. Physical drive states OK, Failed, Predictive Failure, Rebuilding, and Erase In Progress and logical states OK, Interim Recovery Mode, Rebuilding, and Failed each map to a safe or destructive next step. Commands like create type=ld drives=... forced, modify reenable, and modify erase are destructive and overwrite array structure.

The Smart Storage Administrator CLI reports the controller's view of each physical drive and each logical drive. When data is at stake, read the state before running any command, because the difference between a benign status and a stop-and-image status decides whether the array survives. Safe inspection commands include ctrl all show config, ctrl slot=0 show detail, pd all show status, and ld all show status; these only read.

Physical Drive States

OK: The physical disk is functioning normally and participating in the array. Benign state, no action required for that member.
Failed: The drive has dropped offline and the controller can no longer communicate with it. Stop, power down, and image the drive. Do not run modify reenable to force it back online.
Predictive Failure: The drive has tripped SMART thresholds or exceeded the controller's error counters. Stop, power down, and image the drive before total mechanical or firmware failure occurs. A predictive-failure member read under a live rebuild is a candidate for the second failure that collapses a RAID 5.
Rebuilding: The controller is regenerating parity or mirror data onto a replacement physical drive. The array is reading every surviving member under sustained load; a URE here can drop a second drive. If the data matters more than uptime, abort the live rebuild and image the members offline.
Erase In Progress: The drive is being actively wiped by a modify erase command. This is a destructive process. Abort immediately if the data is required, and power the server down rather than letting the erase complete.

Logical Drive States

OK: The logical drive is optimal and all members are online. Benign state.
Interim Recovery Mode: The array is degraded and running on parity or a surviving mirror after a member failure. Stop, power down, and image. Continuing to run in Interim Recovery Mode risks total data loss if a second drive fails, which on a single-parity RAID 5 takes the logical drive offline.
Rebuilding: The logical drive is regenerating data onto a replacement or hot spare. Read errors on the remaining drives will puncture the stripe. Monitor closely, or better, abort and image the members before the rebuild reads a latent bad sector.
Failed: The logical drive is offline because the number of failed members exceeded fault tolerance. Stop, power down, and image all members. Do not attempt to force the array online or recreate it.

Destructive commands to avoid on an array you want recovered. create type=ld drives=... forced overwrites the existing RIS metadata and initializes a blank volume. modify reenable on a failed drive triggers a controller warning that previously existing data may not be valid or recoverable, and forces parity regeneration using potentially corrupt data. modify erase securely erases the disk. If a member shows Failed or the logical drive shows Interim Recovery Mode or Failed, power down and image rather than running any of these.

What Does ssacli ctrl all show config detail Report Before Imaging?

The config detail dump is the single read-only command that captures the controller's entire view of the array before anyone touches a drive. Run it, and the two per-slot detail commands below, while the server is still in its original state, and save the output. Everything in this sequence reads; none of it writes to the members or to the controller NVRAM.

ssacli ctrl all show config detail
ssacli ctrl slot=0 pd all show detail
ssacli ctrl slot=0 ld all show detail

Read these fields before deciding whether to image:

Controller and array status. The controller Status line and each Array status tell you whether the controller still presents a coherent configuration or has dropped the logical drive. A controller reporting OK over a logical drive that is Failed is the signature of exceeded fault tolerance, not a cabling fault.
RAID level. The Fault Tolerance or RAID Level field records the geometry the controller built. A dual-parity volume appears here as "RAID 6 (ADG)," which tells you to expect two parity syndromes and a two-member failure tolerance when you reconstruct.
Failed physical drive location. Each physical drive prints its Port, Box, and Bay along with its Status. Record the port/box/bay of any member marked Failed or Predictive Failure so the imaged member maps back to its array position; this is the same mapping the RIS encodes.
Cache and battery state. The Cache Status, Cache Backup Power Source, and Battery/Capacitor Status fields reveal whether write-back caching was active and whether the FBWC could still flush. A battery in a Failed or Degraded state, paired with a recent power event, means the on-disk metadata may be stale from trapped writes.
Parity and transform status. A logical drive mid-rebuild, mid-expansion, or mid-transform reports a Parity Initialization or Transformation status with a percentage. A transform in progress means the geometry is actively changing on disk, which is a stop-and-image trigger, not a wait-for-completion one.

The create, modify reenable, and modify erase commands covered above stay off the table while data is at stake. The assessment sequence here only reads, so it is safe to run before the decision to power down and image.

Transportable Arrays16/17

Can You Move HP Smart Array Drives Between ProLiant Servers?

HP arrays are physically transportable between chassis because Smart Array geometry lives on the member drives. Forward migration to a newer P-series controller works; backward migration fails because older firmware cannot parse newer RIS schema. Crossing from P-series to MR416i-p categorically fails; the Gen11 controller reads Broadcom DDF at end-of-disk, not HP's start-of-disk RIS.

Because Smart Array geometry lives on the member drives (the RIS in raw reserved sectors at the start of the drive on P-series and E-series Gen8 to Gen10, Broadcom DDF on the trailing sectors on Gen11 MR-series), HP arrays are physically transportable between chassis.

Unlike Dell PERC, which requires the operator to explicitly Import Foreign Configuration from the controller BIOS, an HP Smart Array auto-detects the array on boot by scanning the RIS, matching UUIDs across members, and presenting the logical drive to the OS. SSACLI shows it as an operational array.

The import semantics split along the same controller boundary as the metadata format. P-Class and SR Gen10 controllers (P410, P420, P816, P408i-a) auto-import a foreign array by scanning the start-of-disk RIS at boot, with no explicit Import Foreign Configuration prompt to confirm. The Gen11 MR416i-p does not behave that way: as a Broadcom MegaRAID controller it follows standard MegaRAID DDF foreign-import semantics, expecting end-of-disk DDF metadata and surfacing the array as a foreign configuration to be imported.

A P-series array dropped onto an MR416i-p produces no valid configuration because the Gen11 controller never looks at the start-of-disk RIS. For the pure RAID-controller angle across HP Smart Array families, see our HP Smart Array controller recovery page.

The auto-import behavior masks three real limits that matter for recovery.

Forward generational migration works. Moving drives from a P410 (Gen8) to a P440ar (Gen9) or P408i-a (Gen10) usually succeeds. The newer firmware recognizes the older metadata revision and imports the array.
Backward migration fails silently. Drives from a Gen10 P408i-a placed in a Gen8 P410 will not import. The older firmware cannot parse the newer RIS schema. The controller may offer to initialize the drives, which would destroy the array.
Migration to Gen11 MR416i-p categorically fails. The MR416i-p is Broadcom MegaRAID. Its DDF parser scans the end-of-disk reserved area and does not look at the RIS. Any Gen8-Gen10 array moved onto an MR416i-p reports no valid configuration. The reverse is equally true: Gen11 DDF metadata is invisible to the HP Smart Array parser on a Gen10 P408i-a.

The operational rule that follows from this: if you are evacuating drives from a dead ProLiant into a working donor server to read the data, the donor controller must be the same generation or one step newer in the same controller family. Crossing the P-series to MR-series boundary requires offline reconstruction against drive images, not a chassis swap.

Faq17/17

HP ProLiant Smart Array Recovery; Common Questions

Why does HP Smart Array recovery differ from Dell PERC recovery?

Dell PERC controllers store RAID metadata in DDF (Disk Data Format) at the end of each drive. HP Smart Array uses a proprietary Reserved Information Sector (RIS) written to raw reserved sectors at the start of each member drive, independent of any partitioning scheme. During reconstruction we parse this reserved-sector metadata to determine drive order, stripe size (HP defaults to 256KB vs. Dell’s 64KB), and parity rotation.

My ProLiant shows '1785 - Drive Array Not Configured' at POST. What happened?

POST Error 1785 (Drive Array Not Configured) means the Smart Array controller queried the attached drives but could not assemble a valid RAID geometry. This occurs when no drives are attached, when the RIS metadata is corrupt or wiped, or when enough member drives have failed that the controller can no longer locate a consistent descriptor set. The array is typically reconstructable offline by imaging the member drives and parsing the surviving RIS metadata.

The P408i FBWC module shows 'Cache Temporarily Disabled.' Does that affect recovery?

No. The FBWC (Flash-Backed Write Cache) failure means the controller stopped caching writes and switched to write-through mode. The data on the array drives is still intact. The performance impact matters for live servers but does not change the recovery process. We image the drives and reconstruct the array normally.

What is POST Error 313 on a P440ar, and can you recover the data?

POST Error 313 indicates the HPE Smart Storage Battery has failed and the controller has disabled the Flash-Backed Write Cache. If the server lost power while the FBWC contained unflushed writes, the on-disk array metadata may be desynchronized. We extract the cache contents by powering the FBWC module independently and reading the pending writes, then reconcile them with the drive images.

How much does HP Smart Array recovery cost?

Per-drive imaging fee based on each drive’s condition, plus an array reconstruction fee with HP metadata parsing. No data recovered means no charge.

Do you support the Gen11 MR416i-p controller?

Yes, with caveats. The MR416i-p is a Broadcom MegaRAID controller, not a traditional HP Smart Array. It uses PCIe Gen4 Tri-Mode interfaces and supports SAS, SATA, and NVMe drives simultaneously. When Self-Encrypting Drives are used with the SPDM hardware root of trust, chip-off recovery is not possible; board-level repair of the original controller is required to maintain the cryptographic key chain.

What does POST Error 1779 mean on an HP ProLiant?

POST Error 1779 fires when the Smart Array controller boots and detects a drive that was previously marked failed but now reports operational, or a raw replacement drive inserted while the server was powered off. The controller halts POST and prompts F1 (disable logical drives) or F2 (force online). Pressing F2 on the wrong drive can initiate background parity calculations that overwrite valid data. If you see 1779 on a degraded array, power the server down and image every member drive before responding to the prompt.

Can I move HP Smart Array drives from a P410 to a P440ar?

Forward migration usually works. The newer controller scans the RIS on each drive, matches the array UUIDs, and auto-imports the logical drive without prompting for a foreign-config confirmation. Backward migration (Gen10 drives onto a Gen8 P410) typically fails because older firmware cannot parse newer metadata revisions. Moving any Gen8-Gen10 drives onto a Gen11 MR416i-p categorically fails: the MR416i-p is Broadcom MegaRAID and reads end-of-disk DDF, not HP's start-of-disk RIS.

Does an HPE Smart Storage Battery failure mean my data is lost?

Not by itself. The Smart Storage Battery powers the supercapacitor cache flush during host power loss. If the server is currently running and the battery degrades, the controller drops to write-through mode and POST Error 313 fires on the next boot. Data already on disk is intact. The danger is sequential: a battery failure that occurred during an earlier power event may have left dirty stripes in the FBWC NAND. Those writes are recoverable by powering the FBWC module independently and replaying them into the drive images.

Why won't generic RAID destriping software rebuild my HP array?

HP Smart Array uses a 256KB default stripe and left-symmetric parity rotation for RAID 5 and RAID 6. Consumer tools (R-Studio, ReclaiMe, default mdadm guesses) assume 64KB stripes with right-asymmetric rotation. Pointing them at HP member drives produces a structurally valid logical volume whose internal contents are scrambled: VMFS datastores fail to mount, NTFS Master File Table entries land in the wrong sectors, and SQL data pages corrupt at the row level. The geometry must come from the RIS metadata, not from a guess.

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