DRBD Collective!<div>We are planning on expanding an existing DRBD resource, and have a pretty straightforward question on how to do it. I have read every thread, document and more, and it really does boil down to this: does a half-way decent RAID controller qualify as a dynamic backing block device?</div>
<div><br></div><div>Here is our pancake, which isn't too complex:</div><div><br></div><div>[xen]</div><div>[vm filesystem]</div><div>LVM [because xen wants it]</div><div>iSCSI</div><div>DRBD (on a block device /dev/sdb, not a partition or LVM)</div>
<div>LSI 9260i RAID10</div><div>8x HDDs</div><div><br></div><div>We would like to make 8x HDDs --> 12x HDDs. We know that we can use the various LSI tools to expand the 8-way raid10 to 12 way, and this is very straightforward. I also know that we can do a rescan of the /dev/sdb device so that Linux can see the increased size. We do that on both primary/secondary, both of the servers think they now have the increased size, and then the DRBD resize.</div>
<div><br></div><div>Once the array is expanded to 12 drives, can we do the online drbdadm resize? The backing block device would already be bigger, so we *think* that should work, but we are unsure. </div><div><br></div><div>
Any help is very, very appreciated. Thank you in advance!</div><div><br></div><div>Randal</div><div><br></div><div>P.S. We are terrified of the offline resize because it just seems fraught with pitfalls, and the online seems so easy :-)</div>