[CentOS] FSID and NFS

Sun Aug 17 23:24:05 UTC 2008
Mag Gam <magawake at gmail.com>


This helps a lot!

On Sun, Aug 17, 2008 at 7:20 PM, Filipe Brandenburger
<filbranden at gmail.com> wrote:
> On Sat, Aug 16, 2008 at 11:30, Mag Gam <magawake at gmail.com> wrote:
>> What is the purpose of FSIDs? I am exporting 30 volumes via NFS. Do I
>> need a FSID option?
> FSID is needed in NFSv3 if the devices you are exporting may change
> minor numbers across reboots. For example, if you have a filesystem on
> /dev/sdc1 that you mount and export, if it is always /dev/sdc1 (and
> not sometimes /dev/sdd1 depending of having another disk attached
> during boot time) you don't need it. However, if you are exporting
> filesystems which are mounted on LVM volumes (which will change order
> on the next reboot if you create or destroy new logical volumes) you
> should set FSIDs explicitly to avoid them changing on the reboot.
> If you don't set the FSIDs explicitly, after a reboot of the NFS
> server, you may experience NFS clients that show the contents of a
> different filesystem where you formerly had a specific one mounted, or
> more frequently you will have your mounted filesystems with "Stale NFS
> filehandle" errors. You will have to unmount and remount the
> filesystems on all clients to fix these problems.
> HTH,
> Filipe
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