On Mon, Nov 23, 2020 at 6:43 PM Bryn M. Reeves wrote: > This is a classic (aka CoW/copy-on-write or "thick") snapshot since it > was created with a size (-L 70GB). When creating a thin snapshot you do > not specify a size for the snapshot LV - it consumes space from the > associated thin pool as needed. > > Generally you can find information about the LVs on your system using > the "lvs" command. The "Attr" field displays lv attributes including the > volume type - see the NOTES section of 'man lvs' for the meaning of the > values. The lvs report can also show you whether a snapshot is using CoW > or thinp and the amount of data it is consuming. > I have now migrated to thin snapshots: These are my logical volumes: # lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert fedora vgfedora Vwi-a-tz-- 700.00g pool00 16.61 pool00 vgfedora twi-aotz-- 929.75g 12.50 16.61 But I am unable to boot now due to these errors: Nov 24 10:44:00 localhost.HPNotebook dracut-initqueue[861]: Scanning devices dm-0 for LVM logical volumes vgfedora/fedora Nov 24 10:44:00 localhost.HPNotebook dracut-initqueue[886]: inactive '/dev/vgfedora/pool00' [929.75 GiB] inherit Nov 24 10:44:00 localhost.HPNotebook dracut-initqueue[886]: inactive '/dev/vgfedora/fedora' [700.00 GiB] inherit Nov 24 10:44:00 localhost.HPNotebook dracut-initqueue[888]: modprobe: FATAL: Module dm-thin-pool not found in directory /lib/modules/5.8.18-200.fc32.x86_64 Nov 24 10:44:00 localhost.HPNotebook dracut-initqueue[888]: /usr/sbin/modprobe failed: 1 Nov 24 10:44:00 localhost.HPNotebook dracut-initqueue[888]: Can't process LV vgfedora/fedora: thin target support missing from kernel? I have tried to mark the volumes as active by : lvchange -kn vgfedora/pool00 lvchange -kn vgfedora/fedora But no change. How do I add the dm-thin-pool module ? I can't even boot. -- Regards, Sreyan Chakravarty