[Lustre-discuss] Lustre and Automount

[Fraser McCrossan]

David Simas wrote:
> On Thu, May 27, 2010 at 12:50:15PM -0600, Andreas Dilger wrote:
>   
>> There have been some reports of problems with automount and Lustre  
>> that have never been tracked down.  If someone with automount  
>> experience and config, and time to track this down could investigate  
>> I'm sure we could work it out.
>>     
>
> The autofs that comes with RHEL5 won't mount Lustre.  We got
> it working with autofs-5.0.3-36, from some version of Fedora.
> Later versions of autofs should also work.  The fix to autofs
> is almost trivial.  A function scans the mount command to
> make sure it contains just "legal" characters.  To get Lustre
> to automount, it needs "@" in it's list of such.  
>
> We did find that the automounter sometimes failed to remove
> the Lustre record from /etc/mtab on unmounting the file system.
> That would cause subsequent remounts to fail.  Another easy
> fix: link /etc/mtab to /proc/mounts.
>
>   

Also, remember that you can't mount Lustre subdirectories. That is, you 
can mount your Lustre filesystem as, say, /home, but you can't mount 
/home/username.

An approach that we are testing (but haven't tried in production yet) 
was suggested by an earlier post from Andreas Dilger, and involves two 
automounts. The first mounts the base Lustre filesystem(s) somewhere 
(say, /lustre) as a direct mount, the second is /etc/auto.home and looks 
like this:

*    -bind    :/lustre/&

In our case we have an executable map that generates the mount line 
based on the contents of the description field in LDAP (which indicates 
which Lustre FS contains the home - we have two), but the principle is 
the same.
> David S.
>
>   
>> Cheers, Andreas
>>
>> On 2010-05-27, at 12:24, David Noriega <tsk133 at my.utsa.edu> wrote:
>>
>>     
>>> We are pre-Lustre right now and have some questions. Currently our  
>>> cluster uses LDAP+automount to mount user's home directories from  
>>> our file server.  Once we go Lustre, is there any sort of  
>>> modification to LDAP or automount(besides the installation of the  
>>> Lustre client programs) needed?
>>>
>>> -- 
>>> Personally, I liked the university. They gave us money and  
>>> facilities, we didn't have to produce anything! You've never been  
>>> out of college! You don't know what it's like out there! I've worked  
>>> in the private sector. They expect results. -Ray Ghostbusters
>>> _______________________________________________
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>>>       
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