[sheepdog-users] Sheepdog 0.9 missing live migration feature

[Hitoshi Mitake]

At Tue, 3 Mar 2015 10:10:45 +0800,
Liu Yuan wrote:
> 
> On Mon, Mar 02, 2015 at 09:35:13PM +0100, Walid Moghrabi wrote:
> > 
> > Hi, 
> > 
> > 
> > I just updated to 0.9.1 which apparently fixes many snapshot related issues I got but now, it is impossible to live migrate virtual machines anymore. 
> > I know this feature is not supported by 0.9, this has been announced and discussed many times but this is very frustrating because this is a must feature especially when used in virtualization clustered stack such as ProxMox or OpenStack. 
> > This is even more frustrating that before 0.9, this was working and pretty well I must say so I don't know why this feature has been removed. 
> > 
> 
> It was not removed, but was broken by Sheepdog's lock mechanism.
> 
> > 
> > Are there any plan in a near future to support live migration again ? 
> 
> We introduced an option to disable the lock mechanism as default, meaning that
> the live migration feature would work as before.
> 
> Following patch in the master branch fixes the problem:
> 
> commit aaa80dc785707f32e2c3818fd5edf74ee05e5144
> Author: Wang Zhengyong <wangzhengyong at cmss.chinamobile.com>
> Date:   Thu Feb 12 00:53:25 2015 -0800
> 
>     Make the vdi lock mechanism optional
>     
>     Current sheepdog driver will send LOCK_VDI/RELEASE_VDI ops,
>     while start/stop QEMU VM with sheepdog protocol, this mechanism
>     will lead qemu-img/qemu-io report error when the sheepdog VDI is locking
>     
>     To keep backward compatiblity, this patch modify the functionality
>     that make the vdi lock mechanism optional(with --lock opention),
>     default VDI lock is disabled
>     
>     Enable VDI lock:
>     e.g. dog cluster format --lock
>     
>     Cc: Hitoshi Mitake <mitake.hitoshi at gmail.com>
>     Signed-off-by: Wang Zhengyong <wangzhengyong at cmss.chinamobile.com>
>     Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
> 
> =================================================
> 
> You can either try master branch to test it.
> 
> Hitosh, it would be great if you can backport this patch to 0.9.x.

Sorry for your inconvenience, Walid. I'll backport it to stable-0.9 later.

Thanks,
Hitoshi

> 
> Thanks,
> Yuan
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