Re: [Xen-devel] XCP: sr driver question wrt vm-migrate

[Jonathan Ludlam <Jonathan.Ludlam@xxxxxxxxxxxxx>]

Yup, vdi activate is the way forward.

If you advertise VDI_ACTIVATE and VDI_DEACTIVATE in the 'get_driver_info' 
response, xapi will call the following during the start-migrate-shutdown 
lifecycle:

VM start:

host A: VDI.attach
host A: VDI.activate

VM migrate:

host B: VDI.attach

  (VM pauses on host A)

host A: VDI.deactivate
host B: VDI.activate

  (VM unpauses on host B)

host A: VDI.detach

VM shutdown:

host B: VDI.deactivate
host B: VDI.detach

so the disk is never activated on both hosts at once, but it does still go 
through a period when it is attached to both hosts at once. So you could, for 
example, check that the disk *could* be attached on the vdi_attach SMAPI call, 
and actually attach it properly on the vdi_activate call.

Hope this helps,

Jon


On 7 Jun 2010, at 09:26, YAMAMOTO Takashi wrote:

> hi,
> 
> on vm-migrate, xapi attaches a vdi on the migrate-to host
> before detaching it on the migrate-from host.
> unfortunately it doesn't work for our product, which doesn't
> provide a way to attach a volume to multiple hosts at the same time.
> is VDI_ACTIVATE something what i can use as a workaround?
> or any other suggestions?
> 
> YAMAMOTO Takashi
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel


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