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Re: [Qemu-devel] [PATCH v12 2/3] quorum: implement bdrv_add_child() and

From: Wen Congyang
Subject: Re: [Qemu-devel] [PATCH v12 2/3] quorum: implement bdrv_add_child() and bdrv_del_child()
Date: Thu, 17 Mar 2016 18:23:07 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 03/17/2016 06:07 PM, Alberto Garcia wrote:
> On Thu 17 Mar 2016 10:56:09 AM CET, Wen Congyang wrote:
>>> We should have the failure modes documented, and how you'll use it
>>> after failover etc Without that it's really difficult to tell if this
>>> naming is right.
>> For COLO, children.0 is the real disk, children.1 is replication
>> driver.  After failure, children.1 will be removed by the user. If we
>> want to continue do COLO, we need add a new children.1 again.
> What if children.0 fails ?

For COLO, reading from children.1 always fails. if children.0 fails, it
means that reading from the disk fails. The guest vm will see the I/O error.

Wen Congyang

> Berto
> .

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