Hello,
Thank you for your answer. I have two drbd - /dev/drbd1 and
/dev/drbd2. And I use them as PVs for LVM which has one Volume Group
hosting all the VMs.
So should I have as many DRBDs as VMs and get rid off LVM at all?
PS. If it is not a secret what are you recommended timeouts?
Thank you!
First, you must eliminate Timed Out on stop operation. May be increasing
timeout on stop will help.
My timeouts isn't a secret, of course. I use 5 minutes stopping timeout
per VM and define longer for VM's that can't stop gracefully in 5 minutes.
I also use KVM virtual domains that always kicked off by VirtualDomain
ocf agent without any errors (except infomessage in logs).
IMHO, one drbd per VM gives more flexibility in configuration, for
example you can spread VM's among nodes in cluster, it's especially
useful in big clusters(6-8 nodes or so).
This setup also helps with drbd write-after-write behavior. It gives
more simultaneous writethrough operations and decrease io latency in VM.
For example, if you have many nodes you can create dedicated replication
network between nodes and get better network throughput.
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