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Forum Discussion
RAID6 resync after drive failure: Data Degraded message
I have a ReadyNAS 528 that is set up for RAID6 using X-RAID, purchased in 2018. Someone else set up the system but they moved on, so I have been maintaining it for the past several years. I had 8 drives installed and one failed a month ago, so I removed it. I figured that running the Balance maintenance operation should move things around to back everything up appropriately but I am still getting a "data DEGRADED" message. I have also tried Scrub and Defrag followed by Balance but that didn't fix it either so clearly something more involved is required. I tried RTFM and searching this forum but wasn't able to find what to do after a drive failure or info about this error message. I want my data to be backed up but mostly I want the machine to flashing its all caps message at me.
5 Replies
I should add that I have 29 TB of free space so I would like to run the system with seven drives rather than purchase a replacement
I have 29 TB of free space so I would like to run the system with seven drives rather than purchase a replacement
At this point, you better care about backup your data....
I had 8 drives installed and one failed a month ago, so I removed it.
You still have single drive redundancy, since you started with RAID-6. But not the two drive redundancy offered by RAID-6.
That is why you see the degraded message. Balancing, scrubbing, etc will not fix it (as you found out). None of those steps restore the original redundancy.
Replacing the failed drive would, but it sounds like you'd rather not.
I would like to run the system with seven drives rather than purchase a replacement
Do you have any experience with the linux command line interface?
I should add that I have 29 TB of free space
What size(s) are the remaining disks?
The “Degraded” status makes sense if the failed drive was simply removed and hasn’t been replaced yet. On a redundant ReadyNAS volume, removing a drive leaves the array degraded until a replacement drive is added and the resync completes. Balance, Scrub, and Defrag aren’t substitutes for rebuilding the missing RAID member. I’d check the volume status and logs first, then replace the failed drive with a suitable disk and let the RAID resync. I’d also make sure there’s a current backup before doing anything further.
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