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?
Thank you,
regards.
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