VM not responding during Backup

May 6, 2021
53
4
13
Bern, Switzerland
We are seeing applications / vms not responding during backup.
We assume, that this is in between the "fs-freeze" and "fs-thaw"?
How could we minimize this time or avoid the issue?

Setting:
  • Cluster with 6 physical servers (only four are have vms to back up at the moment), Network is 25 GbE SFP28
  • Filesystem is Ceph (mostly ssd, some vm also capacity rotating disks with ssd as cache)
  • Backup server is Proxmox Backup Server (on 2 x 1 GbE, not saturated)
today (sample size just one day) we are seeing on 13 vm following times for freeze/thaw
  • 2 x 0
  • 3 x 1 sec
  • 2 x 3 sec
  • 2 x 4 sec
  • 1 x 12 sec
  • 3 x 14 sec
 

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