I am setting up a Xen/AoE cluster. Completely diskless cpu nodes which get their root from disk nodes via AoE (an ethernet based SAN) and then fire up Xen domains which also get their disk from AoE. I have all of this working so far with no RAID involved. Now I want to mirror the disk used by the domain over two separate disk nodes.
When the kickstart fires up it sees that it has hda and hdb. I want to mirror hda and hdb against each other without creating partitions and then I will create logical volumes inside of the mirror device. But kickstart expects me to create partitions and give them names to be used when setting up the RAID. Any way around this?
The reason for doing this is because the machines which export the disk via AoE to the cpu nodes are really just exporting their own local logical volumes which appear as block devices to the xen domain thanks to AoE. I can lvextend the size of the lv on the machine exporting the block device which will become hda to the xen domain and the other machine exporting the block device which will become hdb to the xen domain. Then I do an aoe-revalidate and instantly the xen domain sees a bigger physical volume in which I can expand my logical volumes. If I create one big partition and mirror that I will have a problem because I cannot change the size of a disk partition on the fly when I change the size of the block device under the partition.
Any ideas? -- Tracy R Reed http://ultraviolet.org A: Because we read from top to bottom, left to right Q: Why should I start my reply below the quoted text
