DRBD Collective! 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?
Here is our pancake, which isn't too complex: [xen] [vm filesystem] LVM [because xen wants it] iSCSI DRBD (on a block device /dev/sdb, not a partition or LVM) LSI 9260i RAID10 8x HDDs 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. 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. Any help is very, very appreciated. Thank you in advance! Randal P.S. We are terrified of the offline resize because it just seems fraught with pitfalls, and the online seems so easy :-)
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