Re: [Qemu-devel] [PATCH V19 06/12] quorum: Add quorum mechanism.

[Eric Blake]

On 02/21/2014 02:21 PM, Benoît Canet wrote:
> From: Benoît Canet <address@hidden>
> 
> This patchset enables the core of the quorum mechanism.
> The num_children reads are compared to get the majority version and if this
> version exists more than threshold times the guest won't see the error at all.

> +++ b/docs/qmp/qmp-events.txt
> @@ -500,3 +500,39 @@ Example:
>  
>  Note: If action is "reset", "shutdown", or "pause" the WATCHDOG event is
>  followed respectively by the RESET, SHUTDOWN, or STOP events.
> +
> +QUORUM_FAILURE
> +--------------

This should have been inserted in sorted order to match the rest of the
file, rather than at the end.  Can be rearranged in a followup patch,
now that this series is queued.

> +
> +Emitted by the Quorum block driver if it fails to establish a quorum.
> +
> +Data:
> +
> +- "reference":    device name if defined else node name.
> +- "sector-num":   Number of the first sector of the failed read operation.

I'm assuming sector-num is relative to the guest's view of the data?

> +
> +QUORUM_REPORT_BAD
> +-----------------
> +
> +Emitted to report a corruption of a Quorum file.
> +
> +Data:
> +
> +- "ret":          The IO return code.

What values is this likely to contain?  Is it a finite set, in which
case it would be nice to have a QAPI enum that describes the set of
return codes, rather than a raw number?

I'd like to make sure we are happy with the wire format of this QMP
event before it gets baked into 2.0.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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