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Forum Discussion
ReadyNAS 626 Status Is "Degraded" After Successful Resync
Just added a new HDD and am seeing this message after the resync: Dec 13, 2022 06:33:28 AM
Volume: The resync operation finished on volume data. However, the volume is still degraded. Any i...
nsne wrote:
There was at least one hiccup when adding the HDD: The NAS was initially populated with HDDs 1, 2, 3, 4 and 6. Bay 5 was empty. I removed the existing HDD 4 and (perhaps stupidly?) inserted the new HDD in its place. The NAS seemed to think that new disk was the original and then immediately began to resync, which resulted in an error. So I returned the original HDD 4, waited for the resync, then added the "new" HDD to the empty bay 5. It had data-0 and data-1 volumes on it, which I had to destroy.
Can you download the log zip file, and post the contents of mdstat.log? (copy/paste it into a reply).
My posts with the log contents keep vanishing! I guess some automated spam system is in place?
The log is attached as a PDF.
nsne wrote:
I guess some automated spam system is in place?
Yes. The quarantine is manually reviewed by mods, so at some point the missing posts will probably be released.
This is what you posted:
md123 : active raid1 sdb7[0] sdf7[1] 1953364992 blocks super 1.2 [2/2] [UU] md124 : active raid5 sdb6[0] sdf6[3] sdc6[1] 7811627008 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU] md125 : active raid5 sdd5[6] sde5[7](S) sdf5[5] sdc5[4] sdb5[2] sda5[1] 7809112576 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU] md126 : active raid5 sdb4[4] sdf4[7] sda4[3] sdd4[5] sdc4[6] 9766874560 blocks super 1.2 level 5, 64k chunk, algorithm 2 [6/5] [UUUUU_] md127 : active raid5 sda3[5] sdf3[8] sdc3[7] sdd3[9] sdb3[6] 29278353920 blocks super 1.2 level 5, 64k chunk, algorithm 2 [6/5] [UUUUU_]Because you have unequal size disks, your volume has multiple RAID groups concatenated together. If you'd always had the mix of disks in your screen shot, you'd have four RAID groups. You actually have five, which means that at one point in the past you had smaller disks in the the array (6 and 8 TB). More importantly you should actually have six RAID groups.
What you should have is
- md127 - 6x6TB RAID-5
- md126 - 6x2TB RAID-5
- md125 - 6x2TB RAID-5
- md124 - 4x4TB RAID-5 - should include the 14, 16, and the two 18 TB disks
- md123 - 3x2TB RAID-5 - should include the 16 TB and the two 18 TB disks
- md122 - 2x2TB RAID-1 - should include the two 18 TB disks.
What you do have is
- md127 - 6x6TB RAID-5 (degraded) -includes all disks, but sde detected as missing
- md126 - 6x2TB RAID-5 (degraded) - includes all disks, but sde detected as missing
- md125 - 5x2TB RAID-5 - includes all disks, but sde shown as a spare
- md124 - 3x4TB RAID-5 - missing sde together
- md123 - 2x2TB RAID-1 - missing sde altogether, and should be RAID-5
The problem is clearly the 18 TB disk in slot 5 (sde) - the one you just added.
The first thing to figure out is whether sde is healthy. It might not be tested in the volume disk test, since the NAS is confused about its status. Can you connect it to a Windows PC (either with SATA or a USB adapter/dock)?
You're right. At one point I did have smaller disks. I've had this system a while.
The sde is the fifth HDD in the array, correct?
I'd rather let the disk test complete before I go noodling around and potentially cause more issues. Once that completes (and I'm assuming it could take days), I'll pull the HDD, mount it in a spare PC and run SeaTools. Or is there another diagnostic check you'd recommend?
nsne wrote:
The sde is the fifth HDD in the array, correct?
Yes. Though you can (and should) confirm this by looking at disk_info.log. That will give you the serial number of the disk - which you can use to make sure you test the right one.
nsne wrote:
I'd rather let the disk test complete before I go noodling around and potentially cause more issues.
Yes, that makes sense. If you have a backup plan in place, it would be good to make sure your backup is up to date.
nsne wrote:
Once that completes (and I'm assuming it could take days), I'll pull the HDD, mount it in a spare PC and run SeaTools. Or is there another diagnostic check you'd recommend?
Seatools would be good.
I'd power down the NAS, pull the disk and double-check the serial number. You can power up the NAS at that point (the volume should be ok, but of course still degraded).
Personally I'd run both the long generic test, and the "erase disk" advanced test. The erase disk test will remove all partitions from the disk. If you don't run that, then use the Windows Disk Manager to delete all the partitions on the disk.
Then put the disk back - hot-insert is fine. The NAS will sync everything again. When it finishes, the volume will expand - it should end up at 68 TB (61.8 TiB)
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