From: Jason Keltz <jas@cse.yorku.ca>
Subject: Re: fsid question
Date: Tue, 27 Mar 2007 08:50:45 -0400
Message-ID: <46091325.6050403@cse.yorku.ca>
References: <46082D10.1060301@cse.yorku.ca> <46083474.8090906@redhat.com>
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Cc: nfs@lists.sourceforge.net
To: Wendy Cheng <wcheng@redhat.com>
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Hi Wendy,

Thanks for your response..

A few more comments...

On 03/26/07 17:00, Wendy Cheng wrote:
> Jason Keltz wrote:
>> 1) How do I find out the fsid of an existing export so that I can 
>> "hard-code" it in the /etc/exports file?
>>   
> The admin (root, or whoever has access rights to /etc/exports file) can 
> pick one number between 0 and 0xffffffff and add it into /etc/exports. 
> It comes and goes with each "exportfs" command. This id is used to 
> construct NFS filehandle that will be sent to NFS client upon requests. 
> NFS client uses file handle to communicate with NFS server on which file 
> they want to have access. The fsid, if specified, is part of the file 
> handle that uniquely identifies an export (one entry in /etc/exports file).
> 
> So as rule of thumb, you would not want to change fsid as long as there 
> are NFS clients still out there trying to access the files on the 
> server. It is, however, not a permanent ID since there is no filesystem 
> "on-disk" record of it.

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?

>> 3) What is the best way for me to generate my own fsid?
>>   
> It is a number picked by admin and must be between 0 and 0xFFFFFFFF.
> 

Is the fsid specified in hex?

Since the system will allocate its own fsid for NFS exported filesystems 
that do not have a user-specified fsid, how do I choose fsids for my 
user-specified fsid exports that will not conflict with those that the 
system will use?

Thanks,

Jason.

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