Slow proxmox backups via NFS

[pegoku]

I have a NFS server, normally it is fast (~1Gb/s). When I backup a vm it starts at ~800Mb/s and after a while, the speed drops considerably.

 

[Dunuin]

That's usually because of disk caching. Especially when that NFS share is backed by SMR HDDs or QLC SSDs. Do you see the same performance drop then copying a 570Gb file to that NFS share?

 

[pegoku]

That's usually because of disk caching. Especially when that NFS share is backed by SMR HDDs or QLC SSDs. Do you see the same performance drop then copying a 570Gb file to that NFS share?

If I copy it manually, I don't get the speed drop 1159638958080 bytes (1.2 TB, 1.1 TiB) copied, 1539 s, 753 MB/s