Re: [Xen-API] CrossPoolMigration

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hi Ruijin,

In XCP cross-pool migration definitely requires some extra storage magic, since 
storage can only be shared within a pool.

If you are using vanilla xen then the storage is more under your direct 
control. This is both good and bad: you have the ultimate in flexibility but 
you also have to do a lot of stuff yourself.

If your research is mostly on the storage datapath then I would recommend you 
write a tapdisk plugin (like the ones for .vhd support, mirroring etc) and test 
it by manually setting up a tapdisk device with "tap-ctl". If you would like to 
present it as "globally shared storage" to lots of hosts/ pools then you could 
probably write a storage plugin for XCP... As part of the cross pool migrate/ 
storage migrate I'm working on a version 2 of the XCP storage control 
interface. I'd like to publish an early draft of an API in the new year, your 
feedback would be welcome.

Cheers,
-- 
Dave Scott

On Dec 22, 2011, at 3:03 AM, "Ruijin Zhou" <zhouruijin2010@xxxxxxxxx> wrote:

> Hi, Dave,
> 
> Thanks for your information.
> 
> It seems that CrossPoolMigratioon is more like a storage management
> tool than virtual machine itself. Is this the reason you plan to
> implement it on XCP/Xenserver rather than Xen hypervisor?
> 
> Right now, I need CrossPoolMigratioon function on Xen so that I can do
> some research on virtual storage. Is it doable on Xen hypervisor? Or I
> need some function/API from XCP/Xenserver?
> 
> My plan is close to this link http://wiki.xen.org/wiki/CrossPoolMigrationv1.
> 
> Do you have any suggestions?
> 
> Thank you very much for helping me.
> 
> -- 
> With warm regards,
> 
> University of Florida,
> Ruijin Zhou
> zhourj@xxxxxxx
> 
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