Raid 0; State: clean, degraded; DegradedArray Event, no SMART errors

Hopsakee · Jun 6th 2019

Hello all,

I get a daily message stating: "A DegradedArray event had been detected ....

md127 : active raid1 dm-0[1]
2930100224 blocks super 1.2 [2/1] [_U]
bitmap: 18/22 pages [72KB], 65536KB chunk"

But S.M.A.R.T. checks don't seem to find anything unusual and the drives are less than two years old.

I learned the following information might help solving my problem.

Raid 0 (Mirror), with:
1 WD Elements 3TB
1 WD Elements 4TB

I've got no idea what happened that degraded my raid, because I noticed this error probably a long time after it started. It might not have worked properly from the start. It might have to do with my drives being encrypted. I have to unlock my drives again if my system reboots. I also have to restart my monit service manually everytime my NUC Debian driven OMV restarts. No idea what monit does and if it might have something to do with the Raid.

And now, the output from the various CLI commands is in the attachment.
DegradedArrayMirror.txt

geaves · Jun 7th 2019

Quote from Hopsakee

But S.M.A.R.T. checks don't seem to find anything unusual and the drives are less than two years old.

It may not and the fact that the drives are less than 2 years old is irrelevant. The real problem here is that you are using USB to create a Raid that in itself is a very bad idea and if you were to re install OMV USB attached drives can no longer be added to a Raid.

Best way forward, backup your data and start again and use the drives individually, perhaps have data on one and rsync to the other.

crashtest · Jun 7th 2019

Quote from geaves

perhaps have data on one and rsync to the other.

@Hopsakee there's instructions for creating an Rsync command line that will create a full disk backup, in this -> guide starting on page 64 (in the current version). The effect is roughly the same as a RAID1 mirror, without the down side of trying to use RAID with USB. You'll also have backup in the event that something goes wrong with the primary drive.

Hopsakee · Jun 7th 2019

Thanks for the clear reply and added guide. I will do that.

macom · Jun 7th 2019

Maybe you also want to have a look at rsnapshot (available as plugin). It uses rsync and gives you the possibility to restore previous versions of files.

Hopsakee · Jun 15th 2019

@crashtest Thanks for the advice (again) and the guide. I really like it.
@macom Thanks for the rsnapshot plugin advice. I will use that one.

My issue is solved. So I changed the post status. I hope that's correct.

Raid 0; State: clean, degraded; DegradedArray Event, no SMART errors

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