ZFS: task txg_sync blocked for more than 300 seconds

[casalicomputers]

I don't use compression on my backups. One one of my vm's which is too large for vzdump to complete backing up to an NFS mount (in under 24 hours!) I use zfs send/receive with a simple script that does basically "qm snapshot" followed by zfs send/receive followed by "qm delsnapshot" of the prior snapshot and deleting of the old snapshots on the remote zfs volume.

I agree with you, but where do you store backups?
I guess you need another machine with ZFS where you run zfs receive.

 

[vkhera]

I have a FreeNAS box on which I receive the zfs volume, and also use it as NFS service for hosting ISOs and traditional vzdump backups from the smaller VMs.

 

[RobFantini]

hello Vkera

would you mind posting the backup script? I've decided to do something similar and your script may save trial and error/ testing time.

 

[vkhera]

Here ya go. It is hand-tailored to my specific ZFS zvol's, but you can easily add/remove them.

The forum made me upload it as a .txt file, just rename it, obviously.