On 04/24/2011 10:05 PM, Digimer wrote:
Comments in-line.
On 04/24/2011 11:34 AM, Whit Blauvelt wrote:
Digimer,
All useful stuff. Thanks. I hadn't considered three rather than two
networks. That's a good case for it.
Here's what I'm trying to scope out, and from your comments it looks to be
territory you're well familiar with. I've got two systems set up with KVM
VMs, where each VM is on its own LVM, currently each with primary-secondary
DRBD, where the primary roles are balanced across the two machines. As far
as I can tell, and from past comments here, It's necessary to go
primary-primary to enable KVM live migration, which is a very nice feature
to have. None of the VMs in this case face critical issues with disk
performance, so primary-primary slowing that, if it does in this context,
isn't a problem.
You do need Primary/Primary for live migration.
Why do you need a P/P configuration for live migration? From what I
understand the VM state will be migrated from the source host to the target
host and then the storage will be unmounted on the source and mounted again
on the target. That should make the specific configuration of the storage
irrelevant as long as it is remotely mountable from both hosts.
Regards,
Dennis
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