qm migrate -> deletes pve-zsync zfs snapshots

[andy77]

Hello @ all,

we are experimenting with the zfs live migration and have recognized that the migration to another node, will delete all the existing pve-zsync zfs snapshots. So that on the next backup pve-zsync will fail.

Any idea if there is a option to kepp the snapshots on live migration?

Thanks for any hint

Regards

 

[mailinglists]

Been there myself and sadly, this is not possible.
When doing live migration, ZFS snapshots are gone.
Offline migration, would keep them, but I know this does not help you, as it does not help me. :-(

 

[andy77]

Hi, thank you for your answer. That's bad. Why the snapshots needs to be deleted on live migration? I think this makes no sense.

 

[mailinglists]

I feel you man. We are in the same boat.

I guess it has something to do with qemu migrating devices, which is not aware of underlying storage options.

What I do is, I just kill the pve-zsync job, move the backups on the backup server to some different zfs location, which my script deletes after some time, and after all migrations are complete, recreate the sync job. It is a PITA and I am currently looking at znapzend to get around this.

 

[Knuuut]

Hello @andy77 ,
I think you mean move disk and not live migration...?

Live migration -> transfering a running VM from one node to another, storage kept
Move disk -> transfering a running VM disk image from one storage to another, node kept

Cheers Knuuut

 

[andy77]

@Knuut
well no I mean really live migrations. The storage is kept, but the snapshots are deleted, so that on next pve-zsync the backup fails.

 

[andy77]

@mailinglists
Hmm... what is the difference between pve-zsync and znapzend? As I understand it will also use the "send" and "receive" snapshots from zfs. So this would cause the same problem, as the live migration would just delete your snapshots.

 

[mac.linux.free]

Been there myself and sadly, this is not possible.
When doing live migration, ZFS snapshots are gone.
Offline migration, would keep them, but I know this does not help you, as it does not help me. :-(

is live migration working with zfs? on iscsi? local?

 

[andy77]

@mac.linux.free
yes sure, but only from the comand line

qm migrate 100 newnode --online --with-local-disks

 

[mac.linux.free]

@mac.linux.free
yes sure, but only from the comand line

qm migrate 100 newnode --online --with-local-disks

thank you..and if zfs replication is active?

 

[andy77]

That's something I cannot answer because I do not use it.

 

[Knuuut]

qm migrate 100 newnode --online --with-local-disks

---with-local-disks explains everything. This would be a live migration including moving disks.
This will not happen on shared zfs storage.