On Wednesday, August 21, 2013 6:02:31 AM CDT, g.danti@xxxxxxxxxx wrote:
Hi all,
I have a question about Linux KVM HA cluster.
I understand that in a HA setup I can live migrate virtual
machine between host that shares the same storage (via various
methods, eg: DRDB). This enable us to migrate the VMs based on
hosts loads and performance.
ìMy current understanding is that, with this setup, an host
crash will cause the VMs to be restarded on another host.
However, I wonder if there is a method to have a fully
fault-tolerant HA configuration, where for "fully
fault-tolerant" I means that an host crash (eg: power failures)
will cause the VMs to be migrated to another hosts with no state
change. In other word: it is possible to have an
always-synchronized (both disk & memory) VM instance on another
host, so that the migrated VM does not need to be restarted but
only restored/unpaused? For disk data synchronization we can use
shared storages (bypassing the problem) or something similar do
DRDB, but what about memory?
You're looking for something that doesn't exist for KVM. There was a project once for it called Kemari, but afaik, it's been abandoned for a while.
Thank you,
regards.
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