Backing-up VMs on a NFS device with Proxmox can be problematic.
In my case, the backup process caused an high io-wait level that ended in a VM freeze.
The solution that i've found is to put a limit on the backup transfer bandwidth from the Proxmox machine to the NFS volume.
This is the result:
The software that makes backups in Proxmox is vzdump
It's configuration file is located in
So edit this file with
# from the
bwlimit line and set your limit in KB/s
# vzdump default settings #tmpdir: DIR #dumpdir: DIR #storage: STORAGE_ID #mode: snapshot|suspend|stop bwlimit: 5120 #ionice: PRI #lockwait: MINUTES #stopwait: MINUTES #size: MB #maxfiles: N #script: FILENAME #exclude-path: PATHLIST
(This is my first post in English, there may be grammar errors)