When a NAS storage pool crashes, do not click Repair or Rebuild - writing to surviving drives at this stage can overwrite the parity data needed for recovery and turn a recoverable situation into permanent data loss.
The most expensive mistake you can make with a sick NAS is the instinctive one: seeing a red "Crashed" status and immediately clicking Repair or Rebuild. With a crashed storage pool, that single click can write over the very parity data a recovery would have needed, turning a salvageable situation into permanent loss. Stop, breathe, and read the status carefully before you touch anything.
If your NAS reports the storage pool as crashed, do not click Repair or Rebuild yet. A crashed pool means the array is already inactive, and forcing a repair can overwrite parity and finish off your data. Power down, note which drives failed, get the important data copied off first, and only then consider repair or professional recovery.
This distinction decides everything. A degraded pool has lost one drive but is still online and readable, because the remaining drives plus parity can reconstruct the missing data. Degraded is the state where Repair is the correct, intended action: you swap the bad drive and rebuild from parity.
A crashed pool is past that point. It usually means a second drive started failing during normal use or a scrub, and a single-parity array cannot survive two faulty members. The system marks the array inactive and reports the pool as crashed. At that stage the friendly Repair button no longer does what its label implies, and hammering it can do harm.
When a pool crashes, your remaining good data is still sitting on the surviving drives, held together by parity relationships. Any write to those drives, including a rebuild attempt, changes that delicate state. If the rebuild assumes a drive is healthy when it is marginal, the process can scramble parity across the array and overwrite the exact blocks a recovery tool would have read.
There is a second trap. Rebuilds put heavy, sustained load on the surviving drives for hours. If those drives are already tired (which is common when one has just died), the strain can push a marginal drive over the edge mid-rebuild, taking the rest of the pool with it. So the safe order is always: secure the data, then repair, never the reverse.
Power the NAS down to stop any background activity, then check which bays show faults so you know how many drives are genuinely bad. If the data is irreplaceable, your priority is getting a copy off the array before any write happens, ideally by imaging the drives or using a recovery workflow rather than the built-in Repair. Keep a spare drive ready so you are not tempted to reuse a suspect one, and you can size up a fresh diskless NAS or replacement unit at Evetech if the chassis itself is suspect. A fast SSD from the bestsellers shelf is also worth having on hand for staging the rescued files off the array.
If two or more drives have hard-failed and the data matters, this is the moment to involve professional recovery rather than experimenting. Only once the data is safe, or you have accepted the loss, should you rebuild the pool from scratch.
No, not as a first move. A rebuild writes to the surviving drives and can overwrite parity needed for recovery, and it stresses tired drives that may then fail. Copy the data off first, then rebuild.
Repair and Rebuild both attempt to restore redundancy by writing reconstructed data to the array. They are appropriate for a degraded pool that is still online, but on a crashed (inactive) pool they can do more harm than good.
The NAS status tells you. Degraded usually shows a warning state with the pool still accessible, while crashed marks the pool inactive and unreadable. Repair is intended only for the degraded state.
Yes, keep them exactly as they are. A recovery process may need to read from a partially failed drive, so do not wipe, reformat or reuse it until your data is safely off the array.
Protecting data on a NAS that just threw a crash warning? Browse NAS units, surveillance-grade drives and staging SSDs in the storage range at Evetech and build in the redundancy that gives you room to recover next time.
No, not as a first move. A rebuild writes to the surviving drives and can overwrite parity needed for recovery, and it stresses tired drives that may then fail. Copy the data off first, then rebuild.
Repair and Rebuild both attempt to restore redundancy by writing reconstructed data to the array. They are appropriate for a degraded pool that is still online, but on a crashed (inactive) pool they can do more harm than good.
The NAS status tells you. Degraded usually shows a warning state with the pool still accessible, while crashed marks the pool inactive and unreadable. Repair is intended only for the degraded state.
Yes, keep them exactly as they are. A recovery process may need to read from a partially failed drive, so do not wipe, reformat or reuse it until your data is safely off the array.
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