Re: [Xen-API] cross-pool migrate, with any kind of storage (shared or local)

[Marco Sinhoreli <msinhore@xxxxxxxxx>]

Hello Dave:

Great initiative this news. What about implement this to shared
storage protocol like NFS for example? There are some plan to do that
or the iscsi protocol will be the unique way to implement cross-pool
migration?

Cheers,

On Wed, Jul 13, 2011 at 11:22 AM, Dave Scott <Dave.Scott@xxxxxxxxxxxxx> wrote:
> And my mail client sent this before I'd written the last line which is
>
> "Any comments are welcome!"
>
> Thanks,
> Dave
>
>> -----Original Message-----
>> From: xen-api-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-api-
>> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Dave Scott
>> Sent: 13 July 2011 15:22
>> To: xen-api@xxxxxxxxxxxxxxxxxxx
>> Subject: [Xen-API] cross-pool migrate, with any kind of storage (shared
>> or local)
>>
>> Hi,
>>
>> I've created a page on the wiki describing a new migration protocol for
>> xapi. The plan is to make migrate work both within a pool and across
>> pools, and to work with and without storage i.e. transparently migrate
>> storage if necessary.
>>
>> The page is here:
>>
>> http://wiki.xensource.com/xenwiki/CrossPoolMigration
>>
>> The rough idea is to:
>> 1. use an iSCSI target to export disks from the receiver to the
>> transmitter
>> 2. use tapdisk's log dirty mode to build a continuous disk copy program
>> -- perhaps we should go the full way and use the tapdisk block mirror
>> code to establish a full storage mirror?
>> 3. use the VM metadata export/import to move the VM metadata between
>> pools
>>
>> I'd also like to
>> * make the migration code unit-testable (so I can test the failure
>> paths easily)
>> * make the code more robust to host failures by host heartbeating
>> * make migrate properly cancellable
>>
>> I've started making a prototype-- so far I've written a simple python
>> wrapper around the iscsi target daemon:
>>
>> https://github.com/djs55/iscsi-target-manager
>>
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-- 
Marco Sinhoreli

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