Problems setting up nfs backups

[hk135]

Hi There

Thanks for any help in advance, I am trying to setup a backup pool in a Proxmox 4.1 cluster (all hypervisors are running 4.1), when I create the pool I set the only content to be VZDump backup file (even though I am using Vms rather than CTs) and when I try and run a backup I get:

mount error: mount.nfs: /mnt/pve/backups is busy or already mounted (500)

I can confirm that the right share has been mounted on all hypervisors at that path, if I spam the backup button and umount at the same time I can get the backup to run but thats not a long term solution.

Can anyone point me in the direction of what I might be doing wrong?

Thanks
James

 

[hk135]

Please ignore me, this was an issue with exports on the nfs server, we are using btrfs subvolumes to seperate out data and have multiple shares coming from the same filesystem.
Setting fsid=0 and fsid=1 on the exports for the different subvolumes fixed the issue