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RN626X: Data array missing from mdstat after OS reinstall (password recovery)
Hi all, Hoping someone can help me safely recover my data array. Details below: MODEL: ReadyNAS RN626X, 6 disks, RAID 5, ~18TB data (OS 6) TIMELINE: 1. Admin password stopped working une...
QUESTION: Is it safe to manually reassemble the missing data array via mdadm/SSH,
There is always some risk, but often that is small. Download the full log zip file, so you can see more details. If you need help analyzing, then you can upload the full zip to cloud storage, and PM me link (using the envelope icon in the upper right of the forum page). Make sure the permissions allow anyone with the link to download.
md0 : active raid1 (6 disks) — 4GB, this looks like the OS partition
md1 : active raid10 (6 disks) — ~1.5GB, created Jul 10 2026, likely a system/swap partitionYes. md0 is the OS, and md1 is swap.
I went through the full log bundle myself and found this in dmesg.log from the last boot — thought it might save you some digging:
The kernel found all 6 data partitions (sda3–sdf3) but kicked 4 of them (sda3, sdb3, sde3, sdf3) as "non-fresh" due to an event count mismatch, leaving only sdc3 and sdd3 — not enough to start RAID5 (not enough operational devices (4/6 failed)). There's also a systemd-journald message right before it saying the journal was "corrupted or uncleanly shut down," so it looks like an unclean shutdown left 4 of the 6 disks out of sync.
All 6 disks show clean SMART data (0 reallocated/pending/uncorrectable sectors). Does this look like a case for mdadm --assemble --force, and if so, could you confirm the right approach given sdc3/sdd3 appear to be the "freshest" pair?
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