We have three lustre file systems of which one is "stand alone" and uses it's own MGS. We mount all three file systems on every client. The onlydifficultyI came across when mounting all three file systems on a client was that there could be only one MGS per NID. So to make clientcommunicatingwith both MGSs I created an alias network interface and then in modprobe.conf I configured two NIDs<div>
<br></div><div>options lnet networks=tcp1(eth1),tcp2(eth1:0)</div><div><br></div><div>mount -t lustre 10.142.10.201@tcp1:10.142.10.202@tcp1:/scratch /scratch<br><div><div>mount -t lustre 10.142.10.201@tcp1:10.142.10.202@tcp1:/data /data </div>
<div>mount -t lustre 10.42.10.203@tcp2:10.42.10.204@tcp2:/work /work </div><div><br></div><div>Regards,</div><div><br></div><div>Wojciech</div><div><div><div><div><br><div class="gmail_quote">2009/6/26 Andreas Dilger <span dir="ltr"><<a href="mailto:adilger@sun.com">adilger@sun.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">On Jun 26, 2009 10:52 -0500, Carlos Santana wrote:<br>
> Can a lustre file system have more than one MGS? Isn't it only one per<br>
> site? I saw some examples where target type mgs was mentioned during<br>
> mkfs.lustre for MDS and OSS nodes. Is it correct and when is it used?<br>
<br>
</div>It makes sense generally to have a single MGS per site for multiple<br>
filesystems, because if clients are mounting more than one filesystem<br>
they can only communicate with a single MGS at a time.<br>
<br>
In some cases there will of course be a need for multiple MGSes in<br>
a single site (e.g. secure and open networks), which is fine as long<br>
as clients don't try to mount from multiple MGSes at once.<br>
<br>
Cheers, Andreas<br>
<font color="#888888">--<br>
Andreas Dilger<br>
Sr. Staff Engineer, Lustre Group<br>
Sun Microsystems of Canada, Inc.<br>
</font><div><div></div><div class="h5"><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>--<br>Wojciech Turek<br><br>Assistant System Manager<br><br>High Performance Computing Service<br>University of Cambridge<br>Email: <a href="mailto:wjt27@cam.ac.uk">wjt27@cam.ac.uk</a><br>
Tel: (+)44 1223 763517 <br>
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