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Forum Discussion
Volume Degraded after disk replacement
Hi I hope somebody can help me! I got a message one day saying one of my two disks have failed (both 4xTB WD reds). So I replaced the bad one with a 4TB Seagate Ironwolf as the newer WD...
This confirms that the data volume is degraded:
md127 : active raid1 sdb3[2](S) sda3[0]
3902166784 blocks super 1.2 [2/1] [U_]
It should say [UU].
But it's hard to say why, since the new disk looks healthy. Try downloading the full log zip file, and look for errors in system.log and kernel.log.
You might also look at the bottom of volume.log, and see if there is anything useful listed there (in the === maintenance history === section).
You shouldn't post the full log zip here. But you can ask the mods ( JohnCM_S and Marc_V ) to review them for you. What you need to do is first upload the log zip to cloud storage (google drive, onedrive, dropbox, etc). Then send a private message (PM) to the mods, using the envelope icon in the upper right of the forum page. Include a download link to the log zip, and also a link to this forum thread.
One possibility is that the new drive is unhealthy, though not totally dead. It does happen. I recommend testing it in a PC (connected via USB dock or internal SATA) with Seatools.
Hey, Thanks for taking the time to reply!
It turns out that my essentials files were only around 300GB which I could offload and then perform a factory reset.
After the fresh install and resync. It runs perfectly now!
So can we safely rule out hardware at this point ?
There only thing I had noticed prior to all this is my Videos share was showing that I was using 100,000's of GBs. Much more than I have on the NAS. I didn't pay it any attention as it didn't affect anything.
I would love to find out what happened here for others or future me. Luckily I downloaded the logs prior to the reset.
Below is the bottom of my volume.log
=== maintenance history === device operation start_time end_time result details ---------- --------- ------------------- ------------------- --------- ---------------------------------------------------------------- data resilver 2018-03-22 19:29:43 2018-03-23 05:38:19 completed data resilver 2020-10-19 19:23:52 2020-10-19 19:24:03 degraded data resilver 2020-10-25 00:00:51 data resilver 2020-10-25 11:19:14 2020-10-26 06:28:40 degraded data disk test 2020-10-26 09:41:47 data resilver 2020-10-26 10:42:41 2020-10-26 20:48:23 degraded
I suggest running the disk test from the volume settings wheel (after the volume is fully synced). There might still be an issue with one of the two disks.
The incorrect size of the video share suggests that there was some btrfs file system corruption on the first disk.
As far as the logs go, I suggest examining system.log and kernel.log for btrfs or disk error messages. Look in the time window when the last resilvering was being done - 10:42:41 to 20:48:23 on 26 Oct.
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