Hi,
I am having a problem where my client machines are not able to reboot correctly because the NFS mounted file systems are hanging at shutdown time and refuse to unmount.
I am running RHEL3 (Rocks Cluster 3.1) nodes with the latest RH RHEL3 kernel in a cluster environment. The problem occured with older kernels as well.
Relatively little information is actually shared over NFS, and clients almost never have to write to the same files. Mostly clients read some code and configurations files over NFS and then maybe writing a bit of data to isolated locations (no two clients write to the same files).
Even when I shutdown the processes that actually use my nfs file systems and confirm via lsof that no files are open on those file systems manual unmount commands also hang. Autofs also fails to stop correctly claiming that the file systems are busy.
Most of the clients mount filesystems from 3 or 4 servers via autofs. My timeouts are 600 seconds.
The problem is not always consistent. The other day I was able to unmount properly and reboot after various strategies of manual unmounts and shutting off autofs. Today I could not.
So my questions are, if there are no files open on these mounted file systems why would I have such problems? Can you force the NFS file systems to unmount anyway? This is a particular problem because a hang requires manual intervention to power cycle the machine. I would even be happy to have the NFS unmounting be ignored completely and just reboot the system after properly unmounting the local filesystems and ensuring all programs are shutdown.
I would be interested also in any suggestions of how to find what is hanging up my NFS mounts and preventing unmounting...
Thanks for any suggestions,
Terrence Martin UCSD Physics
A few command outputs
[EMAIL PROTECTED] ~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 4127076 3454252 463180 89% / /dev/hda3 71789596 21607120 46535724 32% /state/data none 1030816 0 1030816 0% /dev/shm 192.168.20.3:/home/cdfcaf 101161396 34167296 66994100 34% /home/cdfcaf 192.168.20.3:/home/cdfcaf 101161396 34167296 66994100 34% /home/cdfcaf 192.168.10.5:/falcon/0/users 1463382364 618177588 845204776 43% /home/users frontend-3.local:/export/home/install 10080520 5781204 3787248 61% /home/install
[EMAIL PROTECTED] ~# mount
/dev/hda1 on / type ext3 (rw)
none on /proc type proc (rw)
usbdevfs on /proc/bus/usb type usbdevfs (rw)
/dev/hda3 on /state/data type ext3 (rw)
none on /dev/shm type tmpfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
automount(pid2592) on /home type autofs (rw,fd=5,pgrp=2592,minproto=2,maxproto=3)
192.168.20.3:/home/cdfcaf on /home/cdfcaf type nfs (rw,addr=192.168.20.3)
automount(pid3119) on /home type autofs (rw,fd=5,pgrp=3119,minproto=2,maxproto=3)
automount(pid3149) on /netstor type autofs (rw,fd=5,pgrp=3149,minproto=2,maxproto=3)
automount(pid3180) on /afs type autofs (rw,fd=5,pgrp=3180,minproto=2,maxproto=3)
192.168.20.3:/home/cdfcaf on /home/cdfcaf type nfs (rw,addr=192.168.20.3)
192.168.10.5:/falcon/0/users on /home/users type nfs (rw,addr=192.168.10.5)
frontend-3.local:/export/home/install on /home/install type nfs (rw,addr=192.168.21.1)
cat /etc/auto.master # $411id: /etc/auto.master$ # Retrieved: 02-Sep-2004 21:41 # Master server: 192.168.21.1 # Last modified on master: 04-Aug-2004 04:04 # Encrypted file size: 490 bytes # # Owner: 0.0 # Name: etc.auto..master # Mode: 0100644 /home auto.home --timeout 600 /netstor auto.net --timeout 600 /afs auto.afs --timeout 600 /groot auto.grid3 --timeout 600
On one of the servers cat /etc/exports /export 192.168.0.0/255.255.0.0(rw,sync)
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