Re: [Qemu-devel] Microcheckpointing: Memory-VCPU / Disk State consistency

[Paolo Bonzini]

Il 11/08/2014 22:15, Michael R. Hines ha scritto:
> Excellent question: QEMU does have a feature called "drive-mirror"
> in block/mirror.c that was introduced a couple of years ago. I'm not
> sure what the
> adoption rate of the feature is, but I would start with that one.

block/mirror.c is asynchronous, and there's no support for communicating
checkpoints back to the master.  However, the quorum disk driver could
be what you need.

There's also a series on the mailing list that lets quorum read only
from the primary, so that quorum can still do replication and fault
tolerance, but skip fault detection.

Paolo

> There is also a second fault tolerance implementation that works a
> little differently called
> "COLO" - you may have seen those emails on the list too, but their
> method does not require a disk replication solution, if I recall correctly.