If an HPE Smart Array controller has dropped your ProLiant array offline, hit a 1719 lockup, refused to mount logical drives after a firmware update, or surfaced an unrecoverable-media-error advisory during a rebuild, you’ve reached the right team. The Smart Array line is the dominant RAID controller family across HPE ProLiant deployments, and Smart Array cases account for a substantial portion of the server-class recovery work in our lab. Gillware has operated as a dedicated data recovery laboratory since 2004 from our ISO 5 Class 100 cleanroom in Madison, Wisconsin. Smart Array cases are scoped at intake by an engineer who has handled the failure mode you’re looking at — not by a generic sales gate. See also our RAID data recovery hub.
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How HPE Smart Array Controllers Work
The HPE Smart Array family is HPE’s in-house RAID controller line, descending from controllers HP shipped in Compaq ProLiant servers in the late 1990s. The Gen8, Gen9, and Gen10 generations that dominate the active fleet today line up with the ProLiant generation they shipped with: the P410 and P410i with Gen6/Gen7, the P420 / P420i / P421 with Gen8, the P440 / P440ar / P441 with Gen9, the P408i-a / P408i-p / P416ie-m with Gen9-Gen10, and the SR416i-a / SR932i-p with Gen10 Plus and Gen11. The SR-series Gen10 Plus and Gen11 cards mark a meaningful architectural shift — those controllers are built on Microchip SmartRAID silicon (with HPE firmware) rather than the original HPE-designed silicon, which has consequences for array compatibility within the HPE line itself.
Unlike the SNIA Disk Data Format used by LSI/Broadcom MegaRAID and Dell PERC, Smart Array writes its array configuration in HPE’s own proprietary metadata format. That metadata is recorded across the member drives, so any Smart Array can pick up an existing array as long as the new chassis also has a compatible Smart Array controller. What Smart Array configurations cannot do is move to or from any non-HPE controller. Smart Array arrays do not import on LSI, PERC, or Adaptec hardware, and arrays from those vendors do not import on Smart Array. The format is one-way: Smart Array reads only Smart Array. Smart Array also uses what HPE calls delayed parity for RAID 5 and RAID 6 — the parity rotation is offset by one stripe relative to the standard left-symmetric algorithm. Recovery without the original controller has to detect that offset correctly or the reconstructed array will misalign every stripe.
Smart Array events appear in the iLO Integrated Management Log (IML), in HPE Smart Storage Administrator (SSA), and in the Array Diagnostic Utility (ADU). The patterns we see most often in those logs and on the POST screen at boot are documented in the section below.
Smart Array Error Conditions That Lead to Data Loss
HPE publishes extensive Smart Array event tables across the ProLiant servers troubleshooting documentation and a substantial library of customer advisories. The patterns below are the ones that disproportionately end up at our lab — either because they imply data loss in progress, multiple drive failure beyond the array’s redundancy, or a configuration state where the next attempted action commonly destroys the array. We are quoting the exact POST and SSA strings where applicable, because matching what you’re seeing on screen to a documented condition is the first step toward not making it worse.
POST 1779 — Slot X Drive Array — Replace failed drives. The most common Smart Array POST message that brings cases to us. The controller has detected one or more drives in a failed state on the named slot. On RAID 5 the array typically remains accessible in degraded mode; on RAID 0 the array is already offline. The risk window opens when a replacement drive is inserted: the rebuild reads every surviving sector across the remaining members, and if an unrecoverable read error appears, the rebuild aborts and the array drops. The replacement step looks routine in the OEM workflow; in the field it is the most common path to a fully-offline Smart Array we receive.
POST 1716 and 1915 — Unrecoverable Media Errors during rebuild. HPE customer advisory a00104843 documents these messages, which appear on the IML after the controller encounters URE during a rebuild or during the Background Surface Analysis (ARM) scan on a degraded array. The advisory covers every active Smart Array generation we recover from — Gen8 P420 and P420i, Gen9 P440 / P440ar / P441 / P840 / P841, Gen10 P408i-a / P408i-p / P416ie-m, and the Gen10 Plus and Gen11 SR series. The underlying condition is that RAID 5 cannot recover from URE during a rebuild — once the controller hits an unreadable sector on a surviving member with no parity available to reconstruct it, the bad data either propagates to the rebuild target or the rebuild halts. SSA logs the condition as: “This logical drive has Unrecoverable Media Errors Detected on Drives during previous Rebuild or Background Surface Analysis (ARM) scan.”
POST 1719 — controller lockup events. The P440ar lockup on Gen9 servers is the canonical case. The message reads: “1719-Slot 0 Drive Array – A controller failure event occurred prior to this power-up. (Previous lock up code = 0x12)” or 0x13. The controller has crashed and reset. Arrays may or may not be accessible after boot depending on what state the cache was in when the lockup occurred. HPE’s community-forum guidance is firmware upgrade, which resolves the recurring lockup in many cases — and in others doesn’t, particularly when the lockup left preserved cache or a partial parity stripe in inconsistent state on disk.
Firmware-induced controller bricking. HPE Customer Advisory a00053311 documents one of the most consequential conditions on this list: P440, P441, P840, and P841 controllers configured with a 4 GB cache module that are upgraded from Smart Array firmware version 4.52 or earlier to version 4.60 or later can become permanently disabled after the upgrade. The firmware update is offered as a remediation for unrelated issues; the controller ends the upgrade process bricked. The drives themselves are intact, the array configuration on the drives is intact, but no surviving Smart Array can read it because the firmware on the controller is the lock that opens the format. This is one of the few scenarios where the OEM-recommended remediation action is itself the data-loss event. We have recovered arrays from this advisory’s affected configurations precisely because the recovery path does not depend on a working original controller.
POST 1785 — drive array not configured. The controller can’t find a Smart Array configuration on the attached drives. After a controller replacement, this can mean the new card’s firmware can’t parse the existing metadata. After a chassis move or backplane swap, it can mean drives are in the wrong physical slots — Smart Array uses port assignments as part of array identification, so reseating drives in different bays can render a working configuration unrecognizable. If 1785 appears unexpectedly on a previously-working array, the safe move is to power off and image before any creation prompt is accepted.
POST 1786 — drive array rebuild interrupted. A rebuild was in progress and didn’t complete — power loss, controller reset, or drive failure mid-rebuild. The array is in a partial state. Restarting the rebuild without an intervening evaluation can finish the job correctly, or can propagate stale data through the surviving members depending on which stripes the rebuild had already touched. The right move is to evaluate before resuming.
POST 1787 — drive array drives improperly attached. Drive order is part of the array identification on Smart Array. If drives are pulled and reinserted in different bays — common during diagnostic work or after a chassis swap — the controller sees an array that doesn’t match its port-to-disk map. The drives themselves are healthy, the metadata on each is correct, but the controller’s view of the configuration is broken until the drives are returned to their original positions. Customers who don’t label drives by slot before pulling lose access to the simple fix.
POST 1792 — Valid Data Found in Write-Back Cache. Quoted from HPE’s POST documentation: “Slot X Drive Array – Valid Data Found in Write-Back Cache. Data will automatically be written to drive array.” The controller is holding writes from before the last shutdown that haven’t been flushed to disk. On a healthy array, the cache flushes during the next POST and the array continues. On an array where the underlying drives have changed — replacement, reseat, generation change — the cache can flush against the wrong logical block addresses and silently corrupt the file system on top of an otherwise intact array. The pattern that lands at the recovery lab is “I let the server boot, it said it was writing cache to disk, and now I can’t read any of my data.”
POST 1793 — Logical drive failure. A logical drive has dropped offline beyond the array’s redundancy. Underneath the POST string is the underlying condition — typically multiple failed physical drives on a RAID 5 or beyond two failed members on a RAID 6. The 1793 is the headline; the cause is in the IML and the SSA report.
Cache module and FBWC failure. The Smart Array cache module is a separate field-replaceable unit from the controller card. When the Flash-Backed Write Cache (FBWC) capacitor pack fails, write-back is disabled and the controller operates in write-through, slowing the array dramatically. If the FBWC was holding pinned cache from a previous shutdown when the module failed, that cache cannot be transferred to a new module — HPE does not allow cache transfer between modules. The pinned cache is lost; whatever writes were in it are gone. We see this scenario layered on top of an otherwise intact array.
Cross-vendor migration. Drives moved from a Smart Array to any non-HPE controller will not import. The metadata is invisible to every other vendor’s firmware. Drives moved from any non-HPE source to a Smart Array likewise will not import. We see this case after attempted hardware refreshes where the operator assumed the array would carry over, sometimes after a non-HPE controller has been given the chance to initialize the drives.
Generation gap on the HPE side. Smart Array Gen8 through Gen10 cards (P420 through P408i-a) are built on HPE’s original silicon; the Gen10 Plus and Gen11 SR series (SR416i-a, SR932i-p) are built on Microchip SmartRAID hardware with HPE firmware on top. Arrays do not migrate freely between those generations even within HPE’s own line. A P440ar configuration cannot simply be moved to an SR416i-a, and the failure mode often looks like the foreign-config scenarios above on the PERC and MegaRAID side — new controller cannot read old controller’s arrays.
Predictive failure cascades. Smart Array tracks media errors per drive and flags drives as Predictive Failure when the error rate crosses a threshold. As with PERC and MegaRAID, the drive flagged is often not the actual source of the underlying problem. A bad block on one drive can read as a failure on the drive that performed the read, leading to drive-replacement cycles that don’t address the underlying media-error condition. The Smart Array event for this in SSA reads “Drive failure imminent” or “Drive Failure Predicted” depending on firmware level.
iLO IML and SSA event correlation. The same condition often surfaces in three places: the POST message at boot, the iLO IML entry written for that boot, and the SSA diagnostic report when the OS is up. Reading any one of them tells you what condition the controller thinks it’s in; reading all three rules out the possibility that a transient log entry was mistaken for the current state. The pattern we want before drive imaging starts is a clear correlation between POST, IML, and SSA on the same condition.
One pattern worth naming separately. The standard OEM support-engineer instruction for several of the conditions above — 1779 with a degraded array, 1785 after a controller swap, 1792 with valid cache data, 1719 with firmware updates available — is to import, accept the rebuild, or let the cache flush. Those instructions work cleanly when the array is healthy and the underlying condition is benign. When a second member is degraded, the cache reflects a previous controller state, the firmware version is in the a00053311 brick window, or the rebuild will hit URE on a surviving member, the same instructions destroy the data the customer called to save. The real decision in front of a downed Smart Array is not “OEM support versus recovery shop” — it is “execute the OEM remediation now and accept whatever happens” versus “image the drives first and recover before any further controller-side action.” A short call with our engineering team scopes which path applies.
How We Recover HPE Smart Array Arrays
We never operate a failed Smart Array array during recovery. Running a degraded array during diagnostic work risks pushing the next drive over the edge and turning a recoverable case into an unrecoverable one. Each drive is removed from the chassis, bay positions documented, and imaged on isolated, write-blocked hardware in our cleanroom. Physically damaged drives are repaired with donor parts as needed before imaging — head replacements, PCB swaps, firmware recovery, and platter burnishing where the surface has been damaged. We work from drive images for everything that follows; the originals stay shelved and untouched.
Once we have a verified image of every drive, our reconstruction work begins. HOMBRE — Gillware’s in-house RAID and file-system reconstruction software, built and maintained by the engineers who use it — inspects every single sector of every drive image, identifying HPE Smart Array metadata blocks across the member surfaces and file-system forensic artifacts throughout. That sector-by-sector inspection is the key to rebuilding a Smart Array array without the original controller. We don’t depend on the controller to tell us what the array looked like; HOMBRE reads it directly from the drives.
On Smart Array arrays specifically, HOMBRE identifies HPE’s proprietary configuration records (distinct in layout from SNIA DDF), determines the generation-correct parity rotation including HPE’s delayed-parity offset, and reconstructs the stripe size, member ordering, port-to-slot assignments, and starting LBA offset that the original Smart Array firmware was using. Where the array was hosted on a configuration in the scope of advisory a00053311 (P440 / P441 / P840 / P841 with 4 GB cache, firmware 4.60 or later), the underlying data is recovered without depending on a functional original controller at all — the locked firmware on the dead controller is not on the path between us and the data. Where the cache module held writes that hadn’t flushed, those cache contents are inspected directly and decisions about whether to apply or discard particular writes are made with full visibility, not blind.
The engineers running this work see the failure modes catalogued above on a weekly basis. There is no Smart Array condition on this page that we are encountering for the first time. HOMBRE assembles the array as a virtual volume from the images, and the file-system layer above it — NTFS, ReFS, VMFS, ext4, XFS, ZFS, whatever the array was hosting — is recovered against the assembled volume. The deliverable is a file list and an outcome you can act on, rather than a controller that’s been talked back into mounting and then expected to keep working.
Related RAID Recovery Pages
By RAID level: RAID 0 · RAID 1 · RAID 5 · RAID 6 · RAID 10 · RAID puncture. By HPE platform: HP server data recovery · HPE ProLiant data recovery · HPE MSA data recovery · HPE 3PAR data recovery. Return to the RAID data recovery hub for the full overview.
Start Your HPE Smart Array Recovery
If your Smart Array array is offline and production data is on it, power the system down before any other action. Do not accept any rebuild prompt, do not initialize any of the drives, do not clear the controller configuration, do not flush the cache from a CTRL-screen prompt, and do not upgrade the Smart Array firmware if your controller and cache module fall within the a00053311 affected configurations. Label each drive with its bay position before removing it from the chassis — drive order is critical for reconstruction. Ship the full set of drives together; we don’t need the server or the controller card.
Open a case or call and you’ll reach our engineering team. The initial scoping call covers feasibility, recovery approach, and turnaround — production-critical Smart Array cases enter the work queue same-day. Recovery is billed on a standard time-and-materials basis.
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