Hi Mark:<br><br><div><span class="gmail_quote">On 9/25/07, <b class="gmail_sendername">Mark Steele</b> <<a href="mailto:mark@zango.com">mark@zango.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I found this on the Lustre wiki:</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"><a href="http://wiki.lustre.org/index.php?title=Drbd_And_Lustre" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://wiki.lustre.org/index.php?title=Drbd_And_Lustre
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<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Has anyone tested this out?</span></font></p></div></div></blockquote><div><br>Yes, however, your the subject of your e-mail is Lustre in primary/primary mode. I don't mean to assume, however, if you mean the same drbd device shared between two OSS nodes, that would be incorrect.
<br><br>You can however pair OSS machines, as is the only way, and have linux-ha failover the OST in question to the secondary drbd device, making it primary on the stand-by OSS in question. The standby OSS in turn can be primary for it's own OST which fails over to the paired OSS node, so, you end up with an active/active OSS setup.
<br></div><br>As a small example: <br><br>OSS-A has 2 drbd devices available, call them resourceA & resourceB. OSS-A is primary for resourceA and secondary for resourceB. OSS-B is primary for resourceB and secondary for resourceA.
<br><br>Pairing failover nodes OSS-A & B would allow you to failover the OST (drbd device) in question from the failed OSS to the stand-by OSS.<br><br>MDS/MDT's are configured in active/passive mode only as, as of lustre
1.6, we can only have one. <br><br>There is discussion right now on the lustre mailing list regarding HA which you may be interested in. <br><br>-Mustafa.</div>