Public bug reported: In "NFSv4 client" section, "Note that nfs-server:/export is not necessary in NFSv4" is probably not true.
I have a 32 nodes KVM cluster. NFS, host filesystem, KVM storage pool, are all placed on SSD. KVM guests are connected to host through virtio drived GB ethernet. I followed this guide to configure NFS: https://help.ubuntu.com/community/SettingUpNFSHowTo The problem was that, when I execute a program simultaneously (through cssh) on 32 nodes, there were always a number of nodes that encountered "input/output error". The /var/log/messages on client shows "state manager failed on NFSv4 server with error 10022". Interestingly, by changing the item in /etc/fstab from: some-host:/some-dir /nfs nfs rw,bg,hard,intr 0 0 into: some-host:/export/some-dir /nfs nfs rw,bg,hard,intr 0 0 fixed the problem. I don't know how exactly this happens. It's probably caused by some problem in NFS server when it tries to find the right path when all 32 clients are trying to mount NFS at the same time. It's probably a bug in NFS but before it is fixed in NFS, should the Wiki give the instruction that /export is necessary? ** Affects: ubuntu-docs (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1019938 Title: SettingUpNFSHowTo possible mistake To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-docs/+bug/1019938/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
