Comment 5 for bug 1556602

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Guy Thouret (guy-thouret) wrote : Re: LVM cannot mount LVM Cached Volumes from LMDE Betsy

As I understand it, this bug affects any cached volumes created using the lvm2 package from 15.10 and then attempting to mount that volume under 16.04.

I have this issue on two machines. As a workaroundon one of the machines I was able to mount the volume after booting into a 15.10 live environment, converting the lvs back to uncached volumes, booting back to 16.04 and converting to cached volumes again.

Looking at the Fedora bug report this is caused by new cache metadata attributes missing in the metadata of volumes created using previous lvm2 version. A patch exists that adds default attributes to the cache metadata if they don't already exists and this will resolve the issue.

Link to patch: https://www.redhat.com/archives/lvm-devel/2015-November/msg00098.html

I'll check upstream to see if a bugreport exists for this lvm2 package.