Cant Restore VM

[faysal8p]

When I try to restore I am getting this message. My system is Proxmox VE 7.08

progress 98% (read 1578400481280 bytes, duration 2980 sec)​

progress 99% (read 1594506608640 bytes, duration 3134 sec)​

_07-19_52_32.vma.zst : Decoding error (36) : Restored data doesn't match checksum ​

progress 100% (read 1610612736000 bytes, duration 3241 sec)​

total bytes read 1610612736000, sparse bytes 1219400105984 (75.7%)​

space reduction due to 4K zero blocks 0.422%​

temporary volume 'ZFS-Local:vm-201-disk-0' sucessfuly removed​

no lock found trying to remove 'create' lock​

error before or during data restore, some or all disks were not completely restored. VM 201 state is NOT cleaned up.​

TASK ERROR: command 'set -o pipefail && zstd -q -d -c /mnt/pve/TrueNAS/dump/vzdump-qemu-201-2021_10_07-19_52_32.vma.zst | vma extract -v -r /var/tmp/vzdumptmp37444.fifo - /var/tmp/vzdumptmp37444' failed: exit code 1​

 

[Dunuin]

You could run a scrub on your TrueNAS. Sounds like the backup archive got corrupted.

 

[faysal8p]

You could run a scrub on your TrueNAS. Sounds like the backup archive got corrupted.

I created the backup multiple times. But the problem persists. I was making the backup as 'snapshot', should I try something else? Like 'stop' or 'suspend'.

 

[Dunuin]

If you do the backup as "snapshot" it is important to install the qemu-guest-agent inside the guest so the host can tell the guest to drop all caches so you don't loose cached but unwritten data when doing the snapshot. "Stop" would be the most secure way to do backups because everything would be in a defined state and no software is running that could "crash" on an restore.

 

[faysal8p]

I backed up my VM in a Synology NFS and then the restoration was successful. I think there is something wrong with my TrueNAS Dataset. Thanks for your support.

 

[scintilla13]

I'm having the same issue, from an 8TB internal HDD XFS formatted. 4 (of four) backups are unrestorable. I could understand a single corruption but I can't believe 4 backup corruption. That could be a problem with ZST?
The backup process was declared as OK in all the cases by proxmox.
When QEMU-guest-agent is not running the backup normally fails.
Also, the backups on another HDD are corrupted. I tried also to restart proxmox. My version is 6.3.3.

Could I ignore the errors and go ahead in some way (I could restore data from a different backup source after VM restore)?
Thanks

 

[scintilla13]

This article could suggests that ZSTD compression should be avoided
https://github.com/facebook/zstd/issues/2852