Proxmox VE Backup Speed (vzdump) on NFS server

Dan Nicolae

Apr 27, 2016
Hello everyone,

We are using virtual servers with large drives, so large that a backup is taking more than 24 hours. I wonder if there is a way to increase the backup speed.

Configuration is a Proxmox VE Cluster 4.4.13, VM storage is a 7 node (2 osd each node with Intel SSD DC Journal) Ceph Cluster, Ceph Network is build using two gigabit interfaces bond mode with jumbo frames enabled, Proxmox Network is one gigabit interface with jumbo frames enabled.
Backup files are dumped on a NFS server, with two gigabit interfaces bond mode with jumbo frames.

We notice on the graphs that the ceph network is somehow limited to ~ 200mbps /s (there is no network botteneck). The CPU on the compute node is not heavy loaded. And the NFS hard drive can do more ( we did some backups - vzdump, from two compute nodes in thesame time and speed was far greater that 200mbps).

I tried different configurations tuning vzdump.conf by reducing ionice, set the tmpdir (on a local SSD), set bwlimit to 1024000 with no effect. I treied also by using the Proxmox backup feature without compression, also without effect.

If you need more info, please tell me.

So, I'm kind of stuck and I need your opinion on this. How can we increase the speed and solve the problem.



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