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Add RAID fixing

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cryptogopher 2023-11-20 20:44:30 +01:00
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_posts/sysadm/2023-09-15-lvm-cheat-sheet.tl
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@ -21,6 +21,33 @@ List currently used devices and sync status:
{% endhighlight %}
h3. Fix RAID inconsistency due to hardware errors
Run scrubbing - a full scan of RAID LV, which verifies RAID metadata, LV data and
parity blocks:
{% highlight bash %}
# lvchange --syncaction check /dev/vgdev/backup
{% endhighlight %}
If problems are found, this is denoted by @m@ on 9th bit of attributes displayed
by @lvs@:
{% highlight bash %}
$ cat /tmp/lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
backup vgdev rwi-aor-m- 4.00g 100.00
{% endhighlight %}
In such case repair ir required. As of LVM tools 2.03.21(2) (2023-04-21)
@lvchange --syncaction repair@ is unable to deduce which data is correct. The
only safe choice is to rebuild PV on the failed device:
{% highlight bash %}
# lvchange --rebuild /dev/sdb1 /dev/vgdev/backup
{% endhighlight %}
h3. Rebuild RAID1 LV with integrity layer
As of LVM tools 2.03.21(2) (2023-04-21) @man lvmraid@ says: