Hello all, There's possibly a bug related NFSv4 server's behavior on looking for path on /export . 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". I tried different options in client /etc/fstab as well as export settings in server but nothing helps. Interestingly, by changing the item in /etc/fstab from: some-host:/tigers nfs rw,bg,hard,intr 0 0 into: some-host:/export/tigers /nfs nfs rw,bg,hard,intr 0 0 fixed the problem. I'm not familiar with it but I guess that 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. Here's some more information: client: debian "squeeze", 2.6.32-5-amd64 server: Ubuntu Server 12.04, 3.2.0-23-generic nfs version: NFSv4 no security option results of `exports -v`: /export 192.168.100.0/24(rw,wdelay,insecure,root_squash,no_subtree_check,fsid=0) /export/tigers 192.168.100.0/24(rw,wdelay,nohide,insecure,root_squash,no_subtree_check) Please let me know if there's any other information I need to provide. Thanks! Kind regards, -- Song Gao https://profiles.google.com/song.gao.beta/about -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
