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How a Suspended 11-Disk TrueNAS ZFS Pool Was Recovered Without Replacing Any Drive

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A TrueNAS SCALE node returned from an outage with its 11-disk RAIDZ1 pool in a SUSPENDED state, showing multiple faulted drives and one marked as removed. Rather than immediately replacing disks, the administrator identified that simultaneous multi-disk failures typically point to a shared path issue — such as an HBA, SAS cable, or backplane — rather than individual drive failures. The key diagnostic insight is that independent disk failures rarely cluster in time, while shared-path failures do. Before any hardware intervention, several actions were flagged as dangerous: adding disks, wiping or replacing drives, exporting the pool, or running a scrub while the pool remains unstable. Following this methodical approach, the pool was brought back online without a single disk being replaced or modified.

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How a Suspended 11-Disk TrueNAS ZFS Pool Was Recovered Without Replacing Any Drive · ShortSingh