Re: [Xen-devel] [PATCH v11 20/27] Support colo mode for qemu disk

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Changlong Xie writes ("[PATCH v11 20/27] Support colo mode for qemu disk"):
> +Enable COLO HA for disk. For better understanding block replication on
> +QEMU, please refer to:
> +http://wiki.qemu.org/Features/BlockReplication

Sorry, I missed this link on my first pass.  I still think that at the
very least this needs something more user-facing (ie, how should one
set this up).

But, I'm kind of worried that qemu is the wrong place to be doing
this.

How can this be made to work with PV guests ?

What if an HVM guest has PV-on-HVM drivers ?  In this case there might
be two relevant qemus, one for the qdisk Xen PV block backend, and one
for the emulated IDE.

I don't understand how discrepant writes are detected.  Surely they
might occur and should trigger a resynch ?

Ian.

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