cLVM

e100 said:
To dynamically create DRBD volumes we would need to use DRBD on top of LVM.
If I also wanted snapshot backups of the VM on DRBD we would then need to snapshot the LVM under DRBD which is not how vzdump/qmrestore is designed to work.
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LVM snapshots still work, they are just a bit different than how these tools expect right now.

e100 said:
To solve the hot-stand by issue I always setup two DRBD volumes, then have half the VMs on node A with DRBD0 and the other half on Node B with DRBD1.
Very simple solution, not confusing or complex, only requires a little bit of planning and makes split-brain recovery simple.
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The 2 DRBD volume setup makes it harder to move virtualmachines to the other DRBD volume if one needs that. And you have a harder time using 3+ hosts optimally because to balance the load you might have to move virtualmachines across DRBD volumes.

e100 said:
I do not like the idea of adding additional complexity just to solve a problem that is already easily solved.
Your idea has certainly got me thinking, maybe we do need to think about this more to come up with the best solution.
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I do not think you provided the best solution, just a quickfix.


What if one has a multiple hosts setup and wants to move guests to a 2 node setup in times of vacation? weekends? or maybe just nights, to shutdown all but 2 hosts and save power?
 
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