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Date: Thu, 14 May 2015 22:00:49 +0800
From: Wen Congyang <ghostwcy@gmail.com>
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Subject: Re: [Qemu-devel] [PATCH COLO v4 01/15] docs: block replication's
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To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Wen Congyang <wency@cn.fujitsu.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, qemu block <qemu-block@nongnu.org>, Jiang Yunhong <yunhong.jiang@intel.com>, Dong Eddie <eddie.dong@intel.com>, qemu devel <qemu-devel@nongnu.org>, Max Reitz <mreitz@redhat.com>, Gonglei <arei.gonglei@huawei.com>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Yang Hongyang <yanghy@cn.fujitsu.com>, zhanghailiang <zhang.zhanghailiang@huawei.com>

At 2015/5/14 19:19, Dr. David Alan Gilbert Wrote:
> One thing I wanted to check I understand;  how much RAM do the active and hidden
> disks use;  lets say during the 1st checkpoint   10MB of disk is written,
> and during hte 2nd checkpoint a different 10MB of the disk is written
> (to different locations on the disk); how big are the active and hidden
> disks in RAM - are they 10MB or 20MB?

10MB, we will make active and hidden disks empty when doing checkpoint.

Thanks
Wen Congyang