# Snap restore on proxmox with lvm-thin as storage pool seems unstable **URL:** \ **Category:** LINSTOR\ **Created:** [October 17, 2024, 2:54pm UTC](https://forums.linbit.com/t/snap-restore-on-proxmox-with-lvm-thin-as-storage-pool-seems-unstable/375 "2024-10-17T14:54:14Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![ghernadi](https://avatars.discourse-cdn.com/v4/letter/g/9e8a1a/32.png) [@ghernadi](https://forums.linbit.com/u/ghernadi)\ **Post date:** [October 21, 2024, 6:19am UTC](https://forums.linbit.com/t/snap-restore-on-proxmox-with-lvm-thin-as-storage-pool-seems-unstable/375/2 "2024-10-21T06:19:44Z")
Hello, Thank you for the report. We are aware of this issue. We have a few ideas we are currently testing that could address this issue. Some technical background: If you have an LVM volume, and create let’s say 2 snapshots of it, both snapshots will have the original volume as their “origin”. If you know run a `linstor snapshot rollback` (which internally runs a `lvconvert --merge $vg/$snapshot` as the error message states), it merges the snapshot into its origin. So far everything is as expected. After this command two things have changed: First, the LVM snapshot is now gone (since it got merged), but LINSTOR simply creates a new snapshot to “fix” this point. The second point is more problematic: The second snapshot we created in the beginning, which was completely untouched by our `linstor snapshot rollback` and `lvconvert --merge` commands, also “lost” its origin. The data is still there and fine, but this second snapshot can no longer be “merged” into the already rolled back volume. As a workaround, instead of using `linstor snapshot rollback` for LVM-THIN setups, you can manually delete the resources (not the -definition) and `linstor snapshot resource restore --fr $rsc --tr $rsc --fs $snapshot` the snapshot into the same resource-definition. This is actually one of our plans we are testing right now. The idea sounds fine on LVM\_THIN but unfortunately does not work that easily on ZFS setups since there you cannot just delete the volume while it has snapshots (there is a very strict parent-child dependency between ZVOLs and their snapshots). --- _[View the full topic](https://forums.linbit.com/t/snap-restore-on-proxmox-with-lvm-thin-as-storage-pool-seems-unstable/375)._