Here's my situation: my company is currently running an Ubuntu 10.04 Server (ProdDB01) as an NFS file server, for which we currently only have one client, a Mac Xserve running OS X 10.6.4 (Snow Leopard) (ProdApp1). The NFS server is sharing out only one directory: /data/files, where /data is mounted on a RAID 10 (/dev/sdb1) made up of 6x 1TB drives.
The Mac OS X NFS client is set up with a standard NFS mount through the Disk Utility using the mount location "/Users..../bones/shared" mapped to nfs://proddb01/data/files.
Here is the NFS server's fstab and exports files:
# /etc/exports: the access control list for filesystems which may be exported
# to NFS clients. See exports(5).
# Example for NFSv2 and NFSv3:
# /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
# Example for NFSv4:
# /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check)
# /etc/fstab: static file system information.
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
/dev/mapper/ProdDB01-root / ext4 errors=remount-ro 0 1
# /boot was on /dev/sda1 during installation
UUID=b1e5af65-2d97-4bfd-a238-ad0c2277f9ad /boot ext2 defaults 0 2
/dev/mapper/ProdDB01-swap_1 none swap sw 0 0
/dev/sdb1 /data auto rw,suid,dev,exec,auto,nouser,async 0 0
Our issue is that every few days or so (very intermittent times, but mostly noticed in the morning hours between 6-9am), the Mac NFS client unmounts the the "shared" location and won't bring it back up until I 'cd' to the "shared" directory via Terminal/SSH. Once I 'cd', the NFS share is re-mounted and reindexed by the client automatically.
I've seen this in the syslog, but not sure if it's related at all:
Any ideas or troubleshooting that I need to additionally do here? We are fairly new to NFS, so any help is welcome. Thanks all for any support.
Feb 6 07:15:24 ProdDB01 mountd: authenticated unmount request from 192.168.100.200:939 for /data/files (/data/files)
Feb 6 07:15:27 ProdDB01 mountd: authenticated mount request from 192.168.100.200:970 for /data/files (/data/files)