How I got a suspended TrueNAS pool back online without replacing a single disk

Short summary

A TrueNAS SCALE RAIDZ1 pool entered SUSPENDED state after a power outage, with multiple disks showing as faulted. The key diagnostic insight was that simultaneous multi-disk failures usually indicate a shared path problem (HBA, SAS cable, backplane) rather than individual disk failures. After verifying OS visibility and kernel log stability, a simple zpool clear brought the pool back online with no data loss and no disk replacements needed.

• •Simultaneous multi-disk faults usually point to shared-path failures, not individual disk failures
• •Before touching disks, verify OS visibility (smartctl --scan) and kernel log stability (dmesg)
• •Recovery was two commands: zpool clear followed by zpool status — no disks replaced, no data lost

Generated with AI, which can make mistakes.