Best Practices Proxmox Backup Server ISCSI Storage Source

[pascals07]

Hi
on my cluster i use Proxmox Backup Server to backup my VM.
My vm is on shared storage LVM on ISCSI Array
I notice during backup vm are impacted by the backup , slow performance ...
Is there a way to pbs work properly on this configuration without down performance on the vm ?

Thanks for your help

 

[MagicFab]

A few hints:

• Enable QEMU guest agent + dirty‑bitmap backups if you haven't - make sure your VM backups are using the “snapshot mode” with dirty‑bitmaps. This avoids full raw reads every time and only transfers changed blocks after the first backup.
• Set / tune bandwidth limits : In PBS you can set bwlimit for backups so they don’t saturate the iSCSI link. Even a modest cap can keep VM latency acceptable.
• Schedule backups smartly : run backups during off‑peak hours or stagger jobs so multiple VMs aren’t hammering the array at once.
• Network separation - If possible, put PBS traffic on a separate NIC/VLAN from VM traffic so backup reads don’t congest the same path your guests use.

There are other things to look at but I'd say primarily those - perhaps the easiest being a good schedule outside of office hours.

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Fabián Rodríguez | Le Goût du Libre Inc. | Montreal, Canada | Mastodon
Proxmox Silver Partner, server and desktop enterprise support in French, English and Spanish