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Re: [Qemu-devel] vm live storage migration approach.
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] vm live storage migration approach. |
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Date: |
Fri, 30 Jan 2015 12:21:44 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
On 01/30/2015 09:25 AM, Yaodong Yang wrote:
> Hi all,
>
> I'm investigating the current schemes for the VM live storage migration in
> QEMU system. I have the following questions:
>
> 1. What is the functionality of drive_mirror in QEMU? Is it designed as a
> VM live storage migration approach?
Yes. drive-mirror was added precisely to support live storage migration.
>
> 2. What's the difference between drive_mirror and vMotion? I learned that
> vMotion employs IO Mirroring mechanism to migration a running VM with all
> the virtual disk images. Are there any other mechanisms inside QEMU serve
> this purpose as well?
vMotion is not part of qemu, so I'm not sure what it does. Therefore, I
cannot make a fair comparison.
>
> I'm looking for a mechanism in QEMU, which is similar to vMotion ( IO
> Mirroring) in ESX environment.
Look at drive-mirror, block-backup, quorum drives, and lots of recent
threads on this list about adding redundant processing (such as the term
"COLO") for how to piece together lower-level blocks into whatever drive
mirroring scheme you can think of.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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