fsck on lvm partition

fsck on lvm can be a bit tricky. Like a the normal process, the partition needs to be umounted and we can boot up using the rescue cd or in emergency mode. Normally, you

fsck /dev/sda1

if the partition is lvm, you need to activate the lvm first like so

vgchange --ignorelockingfailure -ay
lvscan --ignorelockingfailure (this command should now work)
fsck /dev/volumegroup/lvname

if the logical volume contains a partition, you need to kpartx the lv.

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