From mboxrd@z Thu Jan  1 00:00:00 1970
From: yamamoto@valinux.co.jp (YAMAMOTO Takashi)
Subject: Re: XCP: sr driver question wrt vm-migrate
Date: Tue,  8 Jun 2010 16:11:47 +0900 (JST)
Message-ID: <20100608071147.8D4DB719F7@kuma.localdomain>
References: <1A088E78-0DE4-498F-BC23-57C49A07C93C@eu.citrix.com>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: Your message of "Mon, 7 Jun 2010 13:29:36 +0100"
	<1A088E78-0DE4-498F-BC23-57C49A07C93C@eu.citrix.com>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Jonathan.Ludlam@eu.citrix.com
Cc: xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

hi,

i'll try deferring the attach operation to vdi_activate.
thanks!

YAMAMOTO Takashi

> 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@lists.xensource.com
>> http://lists.xensource.com/xen-devel
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel