Re: fsid question

[Jason Keltz <jas@cse.yorku.ca>]

On 03/27/07 08:56, James Pearson wrote:
> Jason Keltz wrote:
>> The problem is that right now, I have several hundred clients who have 
>> mounted the exported filesystems via NFS where I did not specify an 
>> explicit fsid in the NFS sever /etc/exports file.   In order to start 
>> using the fsid option, I need to know the existing fsids so that I can 
>> hard-code those into /etc/exports.  This way, if the server is 
>> rebooted, the clients will not be affected.  I could then choose fsids 
>> for NEW nfs exported filesystems and hard-code those fsids into 
>> /etc/exports.  Is there a Linux command, or an entry in /proc on the 
>> file server that will let me know the existing fsids?
> 
> I believe you can add a fsid to /etc/exports and re-export the file 
> systems - existing mounts will not be affected. New mounts will pick up 
> the new fsid. The existing mounts will also pick up the new fsid the 
> next time they remount the file system.
> 
> I've certainly done this in the past and had no problems.
> 
> James Pearson

Hi James.

Thanks for your message.

I'm not sure that I understand this though.  If the system is generating 
an fsid for NFS exports in the absence of a user-specified fsid, then 
changing the fsid and re-exporting the filesystem *should* essentially 
confuse the client? How does one choose an fsid that is not already in 
use on the system? I imagine there must be some way to list the 
currently used fsids for exported filesystems.

Jas.

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