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Do not clear the foreign configuration or initialize the disks. A MegaRAID controller marks disks foreign when it detects array metadata that is not present in its current configuration. Importing can restore an existing virtual disk, but CacheCade adds a separate SSD cache layer that may be unsupported, incomplete, locked, or licensed differently on the replacement controller. An import failure does not by itself prove that the data is lost.
Stop writes, document the hardware and disk states, and inspect the proposed layout before changing anything. If the data is business-critical and there is no verified backup, use a RAID-recovery specialist rather than repeated trial-and-error.
What “foreign configuration” means
MegaRAID writes configuration-on-disk metadata to its physical drives. After a controller replacement, reset, cable or enclosure change, or firmware event, the disks may still contain a valid array definition while the controller’s local configuration does not. The controller then reports a foreign configuration.
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Importability depends on the exact controller family, firmware, disk set, RAID metadata, security state, and optional features. Broadcom lists foreign-import support for specific products such as the MegaRAID SAS 9341-4i/8i, not for every MegaRAID-branded controller (product brief).
Why CacheCade makes import harder
CacheCade Pro uses SSDs as a controller-managed acceleration layer in front of HDD-backed virtual disks. It is not the same object as the primary data virtual disk, and neither is it the same as CacheVault. Broadcom describes CacheCade Pro 2.0 as optional SSD cache acceleration and CacheVault as flash-backed protection for controller write cache (9361-8i documentation).
- Primary data virtual disk: the RAID volume containing the filesystem and data.
- CacheCade pool or virtual disk: SSD members associated with one or more primary volumes.
- CacheVault: hardware that protects controller write cache; it does not restore CacheCade metadata.
- Foreign metadata: the recorded relationship among disks, virtual disks, cache pools, and controller settings.
Import can fail when the replacement controller lacks CacheCade support or its feature key, uses a different implementation, cannot see all cache SSDs, has incompatible firmware, sees locked or encrypted drives, encounters conflicting foreign sets, or hits a firmware or StorCLI defect. A controller may therefore see the data disks but reject the complete configuration.
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Preservation checklist
- Stop applications and all writes to the affected storage.
- Do not choose Clear Foreign Configuration.
- Do not initialize, create, or reconfigure a virtual disk with these drives.
- Photograph the warning and record the controller model, serial number, firmware, and existing virtual-disk and CacheCade details.
- Inventory every drive’s enclosure ID, slot, model, serial number, capacity, sector format, and state.
- Confirm every original disk is connected and visible.
- Where practical, make a sector-level copy or obtain a backup before repair attempts.
- If there is no verified backup for important data, stop and escalate.
These steps preserve options; they do not guarantee recovery.
Reconstruct the original configuration
Write down the original and replacement controller models, RAID level, member count and order, stripe size, disk capacities, hot spares, CacheCade status and version, encryption or secure-drive settings, firmware history, enclosure or expander changes, and any missing, failed, blocked, locked, or unsupported disks.
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Do not assume chassis slot order equals logical RAID order. Record what the controller reports instead of rearranging drives by guesswork.
Inspect in the least-destructive order
- Use the controller’s preboot utility (WebBIOS, Ctrl-R, or HII, depending on generation).
- Use MegaRAID Storage Manager only when it supports the controller and configuration.
- Use StorCLI for detailed state, logs, and repeatable output.
- Save all output before attempting an import.
- Use a foreign-configuration preview, when available, and compare it with the documented original.
Management interfaces and feature limits vary by controller. Broadcom’s documentation describes StorCLI, MegaRAID Storage Manager, Ctrl-R, and HII, while its feature addendum shows that support can differ by virtual-disk count and firmware (feature limitations addendum).
StorCLI: inspect first
On many MegaRAID generations, syntax in this family is commonly used:
storcli /c0 show
storcli /c0 /eall /sall show
storcli /c0 /fall show
storcli /c0 /fall preview
storcli /c0 /fall import/c0 assumes controller index 0. Exact commands and output vary by StorCLI branch and firmware; verify them against the installed package and controller guide. show and preview are inspection-oriented. import changes controller state. Do not use a foreign-delete command as routine troubleshooting.
Interpret what you find
All data disks present, CacheCade SSDs missing
The primary array may still be recoverable while the cache layer is unavailable. Do not immediately recreate CacheCade. First determine whether the primary virtual disk can be imported independently. If CacheCade used write-back mode and the controller failed during active writes, obtain vendor-specific advice before discarding the cache metadata.
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One or more data disks missing
Do not force a partial import unless the RAID level, failure tolerance, and preview make it safe. RAID 1 generally tolerates one missing member; RAID 5 one failed member; RAID 6 two; RAID 10 depends on which members are missing; RAID 0 has no redundancy. These are general RAID properties, not a promise that MegaRAID will accept the proposed import.
Disks marked foreign, unconfigured good, failed, or blocked
Record every state before changing it. “Unconfigured good” can still refer to a disk carrying array metadata. Failed or blocked may indicate a physical problem, policy, security lock, foreign state, or firmware mismatch.
No foreign configuration appears
Check visibility, SAS cables, expanders, enclosure IDs, controller mode, encryption or lock state, and whether the disks were previously cleared or initialized. The wrong controller or a stale utility cache can also hide metadata. Broadcom documents a StorCLI case where unlocked drives were not recognized as foreign until the tool’s drive cache was refreshed (release notes).
Compatibility checks before import
- Exact controller family, chipset, and revision.
- Firmware branch and release.
- CacheCade support, version, and required feature key.
- CacheVault or battery-backed-cache state, where relevant.
- RAID level, sector size, SAS/SATA support, and virtual-disk limits.
- Secure-drive or encryption requirements and key availability.
- Enclosure and expander compatibility.
- Driver and management-tool support.
A controller can support ordinary foreign import yet reject a configuration containing a CacheCade pool. Broadcom’s 240-virtual-disk addendum lists CacheCade and automatic enhanced foreign import as unsupported in its stated matrix; that limitation must not be generalized to every model (addendum).
Firmware and controller replacement cautions
Do not begin by flashing firmware. Record the current version and, after a failed controller, prefer the same model or a manufacturer-approved successor with a compatible firmware branch. Newer is not automatically safer, and a downgrade can make metadata unreadable.
Broadcom documents a specific case in which moving from firmware supporting 240 virtual disks to firmware supporting 64 causes DDF and NVRAM incompatibility. Its recovery sequence is specific to that scenario and must not be copied blindly to other controllers or firmware changes.
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Preview matches the original array
Save the preview and logs, confirm a backup or recovery image, and import once. Reboot only if required. After the virtual disk is online, check consistency and filesystem access before considering any cache changes.
Preview is incomplete or wrong
Stop. Recheck cables, expanders, enclosure IDs, disk visibility, locked states, and the documented member layout. Do not force import or randomly reorder drives.
Import reports a feature or compatibility error
Check for missing CacheCade support or licensing, controller-generation differences, firmware mismatch, encryption requirements, and missing SSD members. A matching controller or repair of the original may be safer than repeated attempts.
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Preserve the original security key or credentials and resolve unlock status first. Do not wipe or initialize. Refresh discovery only according to vendor guidance; the documented StorCLI defect shows that stale drive-cache state can affect preview results.
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Can the data array be recovered without CacheCade?
Possibly. CacheCade is an acceleration layer, so intact metadata for the primary data virtual disk may allow recovery even when the SSD cache pool cannot be imported. This is conditional, not universal: cache mode, pending writes, encryption, controller state, and firmware all matter. Keep the CacheCade SSDs untouched until the data volume is online and validated. Recreating CacheCade is a later performance step, not part of initial recovery.
When to stop and call a specialist
- The preview shows a different RAID level or member count.
- The controller requests initialization or erasure.
- Multiple foreign configurations conflict.
- Drives are encrypted or locked and keys are uncertain.
- Disks are dropping offline or reporting unreadable sectors.
- Write-back CacheCade was active during the failure.
- The data is business-critical and no verified backup exists.
Provide support with controller logs, firmware history, complete disk inventory, screenshots, RAID layout, CacheCade mode, and security-key status. A professional RAID-recovery service may be expensive, but it is often safer than destructive experimentation.
Useful official references
- MegaRAID Configuration Software User Guide
- MegaRAID SAS 9361-8i product brief
- 240 Virtual Drive limitations and known issues
- StorCLI Avenger 8.3 release notes
Frequently Asked Questions
Does a foreign configuration mean the disks are damaged?
No. It usually means the controller detected array metadata that is not in its current local configuration. Physical damage, missing members, locks, and incompatibility can still prevent import.
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Sometimes, if the primary virtual-disk metadata is intact, but cache mode, pending writes, encryption, firmware, and controller support determine whether that is safe.
Should I flash newer firmware first?
No. Record the current firmware and investigate compatibility first. Upgrades and downgrades can change metadata interpretation and feature support.
Is CacheCade a backup?
No. It is an acceleration feature, not an independent copy of your data.
Can I recreate CacheCade after importing the data volume?
Only after the primary volume is online, backed up or validated, and vendor guidance confirms that the original cache state is no longer needed.
The Bottom Line
A failed MegaRAID foreign import involving CacheCade is a compatibility and metadata problem until proven otherwise—not a reason to erase the disks. Preserve the evidence, verify every member and feature, preview the proposed layout, and import only when it matches the original configuration. If it does not, stop before initialization and escalate.
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