Proxmox VE 5.4 Multiple NFS Storage and Slow Backup

Oct 2, 2019
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Hi All,

We have a very odd issue. With one NFS Data Store mounted our environment works as expected, with fast backups. Example VM which has a 300GB hard drive backs up within 2 hours 45 minutes. However when we mount the 2nd NFS Data Store the backup time increases to 3 hours 20 minutes - you can see read / write speed drop and then gets slower each day so within 7 days it has increased the backup time to over 7 hours. Remove the data store and the backup returns to normal.

Here are the 2 mounts :-

Thecus NAS
x.x.10.12:/raid0/data/_NAS_NFS_Exports_/pve-backup on /mnt/pve/NAS07-NFS type nfs (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=x.x.10.12,mountvers=3,mountport=58544,mountproto=udp,local_lock=none,addr=x.x.10.12)

QNap NAS
x.x.11.11:/pve-storage on /mnt/pve/NAS06-NFS type nfs (rw,relatime,vers=3,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=x.x.11.11,mountvers=3,mountport=30000,mountproto=udp,local_lock=none,addr=x.x.11.11)

Connected by separate 10GB ethernet directly into Thecus NAS and a QNap NAS.

With either connected on their own it works as expected. Introduce the other and the issue occurs and slowly gets worse. Performance within the VM's seems un-affected it only seems to affect backups.

Thecus only supports NFS 3 where as QNap NFS 3 or 4 - have tried both versions without success.

Any advice greatly appreciated.

Thanks

Roland
 

tim

Proxmox Staff Member
Staff member
Oct 1, 2018
153
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Hi,

whats the backing storage of your vms?
 
Oct 2, 2019
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Hi Tim

Exactly the same mounts that are used for backup. There is no noticeable performance decrease in any of the VMs either Windows or Linux based whether the backup is running or not

Roland
 

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