Shutdown hanging - AutoFS

[Pyers Symon]

We are experiencing problems during shutdown of our 11i systems. We use the automounter (autofs) to access home and application directories which are on NetApps filers. It seems that if remote directories are busy during shutdown (due to logins still being extant or other issues) then they are not being unmounted when NFS stops (I tweaked the /usr/sbin/killall script in order to provide diagnostics) and the system hangs inordinately (20mins+) during the "Killing user processes" (/sbin/rc0.d/K800killall) stage before it moves on to Unmounting Local File Systems.

Both the autofs_proc and the nfskd processes are present at this stage and are not killed by K800killall.

Any ideas as to how to cure this major problem?
(Also posted on sys adm forum)

[Peter Godron]

Pyers,
having home directories NFS mounted always causes problems down the line. You probably have to establish what the offending processes are, that are keeping the NFS mount up and kill them first.
What happens if you try and stop the NFS daemon first?

Otherwise, please see:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=229455

[Dave Olker]

Hi Pyers,

11.23 offers the option of doing a forcible unmount, even if the filesystem is in use, to work around this problem. However on 11.11 you're best bet would to use fuser to find and terminate any processes accessing these mount points before the unmount will complete successfully. You might want to try adding some fuser logic to the shutdown scripts to forcibly terminate any processes touching these mount points.

As for the autofs_proc and nfskd processes, there is no way to terminate those processes. However, they would not be holding any resouces on any NFS mounted filesystems. In other words, there is no way to terminate them but there is no need to terminate them. Your problem is not the nfskd and autofs_proc processes - the problem is some other process holding resources busy on the filesystems you're trying to unmount. If you can identify them and terminate them then the unmount should complete successfully.

Regards,

Dave