Am 2021-11-09 19:56, schrieb Hendrik Boom via Dng:
I upgraded my server to beowulf.
After rebooting, all home directories except root's are no longer
accessible.
They are all on an LVM on software RAID.
The problem seems to be that two of my three RAID1 systems are not
starting up properly. What can I do about it?
Do you still know which devices contained the raid?
I'd first check out the metadata on them:
```
mdadm --query --examine /dev/sdXY
```
Ideally, the ones for the same arrays should have the same Version,
Array UUID, and a number for Events which doesn't differ much.
I'm not much of an export with raid myself. In fact, I already hosed one
of mine once (I followed some tutorial which suggested using "mdadm
--create" for a certain thing, but it was wrong and I should have used
--grow instead).
Anyway maybe try explicitly assembling the devices as a new raid device.
There is also a --readonly option that should avoid it doing anything to
the array, and a --readwrite option, which could be helpful.
```
mdadm --assemble /dev/md5 --readonly /dev/sdXY /dev/sdXY
```
If that works & the raid device works fine (maybe try mounting it), you
can make it readwrite using
```
mdadm --readwrite /dev/md5
```
Alternatively, you could also try --re-add to add devices to an existing
raid again.
I'd avoid doing anything with --create. I think that would be
destructive.
If it does stuff like resyncing after that, you can already use the
device, but maybe wait with a reboot until it finishes.
If you get it working, try doing the `mdadm --examine --scan` thing
again / recreate /etc/mdadm/mdadm.conf. Maybe also recreate the
initramfs using `update-initramfs -u`, just in case.
And if all that works out, you may try rebooting to see if it detects it
again.
If things don't work out, maybe check for error messages / look at
dmesg.
Regards,
Daniel Abrecht
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