[CentOS] NFS lockups

Regarding automount, have you tried autofs?

I'm not a fan of static mounts via fstab.

We've a flaky server and I set my timeout in auto.master for 60  
seconds for NFS servers and about 30 seconds for USB/FW drives.



On Oct 3, 2009, at 6:56 AM, Mike Yates wrote:

> I thought this had been fixed with newer kernels?
> We have an old Maxtor Snap Server, an 80 GB NAS unit, containing  
> some of our archives.
> Both of our CentOS servers have it permanently mounted by NFS for  
> convenient access.
> This weekend, I discovered remotely that, although all systems  
> except the VRTSralus remote agents for Veritas (now Symantec) Backup  
> Exec were working just fine, both servers would freeze a shell solid  
> on starting to run "lsof" or half way through a "df". However,  
> "mount" ran OK and showed the next item in the "df" should have been  
> the Snap Server NFS mount. I pinged it and it did not respond - I'll  
> let you know Monday what is up. "umount -f"  showed "Device busy"  
> but "umount -l" worked just fine and "df" "lsof" and "VRTSralus" all  
> work OK now. BTW the Veritas does not access the Snap Server, though  
> the weekly cron-job to tar-ball the Snap Server at 02:00 Saturday  
> did not email me at all, though it is shown in /var/log/cron.
>
> Does anyone know of a method to make NFS mounts auto un-mount if the  
> remote server disappears?
>
>
> Mike Yates    MBCS CITP (ISSG)
> IT Support Engineer
>
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