Re: [Xen-users] ISCSI SAN n Local Swap n Live migration

[Javier Guerra <javier@xxxxxxxxxxx>]

On Thu, Mar 19, 2009 at 4:16 AM, Ramon Moreno <rammor1@xxxxxxxxx> wrote:
> Has anyone perfected this? :-)
>
> End goal -
>
> Have my domUs on ISCSI
> Point to swap files on local disk
> Be able to perform live migrations.

hum... you could move swap temporarily to shared block device, while
migrating, and back to local device on the new box:

before:
- storage: on shared block devices (as /dev/xda)
- swap: on local device (/dev/xdb)
- one extra unused volume on shared block device (/dev/xdd)

to migrate:
- mkswap /dev/xdd
- swapon /dev/xdd
- swapoff /dev/xdb  (slow...)
- detach /dev/xdb from DomU
--- migrate
- attach /dev/xdb to DomU
- mkswap /dev/xdb
- swapon /dev/xdb
- swapoff /dev/xdd (slow...)

you could skip the mkswap steps if you're reusing the partitions, but
it's usually quite fast.

-- 
Javier

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