Failed to create hard link - Operation not permitted on nfs share

    • OMV 2.x
    • Failed to create hard link - Operation not permitted on nfs share

      We use unitrends uvb backup system for a vmware cluster. There a 4 storages (1 x OMV, 3 x Synology). The Openmediavault-Storage is formatet with xfs und mountet on the backupsystem by nfs. The Synologys are formatet with ext4 and also mounted by nfs to separate virual backup-appliances. The 3 appliances which use the synology storage are able to make hard links on the storage for a full backup. Only the one uvb appliance which is connected to the OMV Storage failed with the following message: "Failed to create hard link - Operation not permitted". There seems to be a permissions issue, but where?
    • root@de215:~# cat /etc/exports
      # /etc/exports: the access control list for filesystems which may be exported
      # to NFS clients. See exports(5).
      /export/65TB (rw,no_root_squash,insecure,rw,sync)
      /export/172 192.168.208.0/23(rw,no_root_squash,insecure,rw,sync)
      /export/173 192.168.208.0/23(rw,no_root_squash,insecure,rw,sync)
      /export/174 192.168.208.0/23(rw,no_root_squash,insecure,rw,sync)
      /export/175 192.168.208.0/23(rw,no_root_squash,insecure,rw,sync)

      # NFSv4 - pseudo filesystem root
      /export (ro,fsid=0,root_squash,no_subtree_check,hide)
      /export 192.168.208.0/23(ro,fsid=0,root_squash,no_subtree_check,hide)

      root@de215:~# exportfs -v
      /export/172 192.168.208.0/23(rw,wdelay,insecure,no_root_squash,no_subtree_check)
      /export/173 192.168.208.0/23(rw,wdelay,insecure,no_root_squash,no_subtree_check)
      /export/174 192.168.208.0/23(rw,wdelay,insecure,no_root_squash,no_subtree_check)
      /export/175 192.168.208.0/23(rw,wdelay,insecure,no_root_squash,no_subtree_check)
      /export 192.168.208.0/23(ro,wdelay,root_squash,no_subtree_check,fsid=0)
      /export/65TB <world>(rw,wdelay,insecure,no_root_squash,no_subtree_check)
      /export <world>(ro,wdelay,root_squash,no_subtree_check,fsid=0)