Re: [Xen-users] problem with extra storage via iscsi

[Ferenc Wagner <wferi@xxxxxxx>]

Gertjan Oude Lohuis <gertjan@xxxxxxx> writes:

> Gertjan Oude Lohuis wrote:
>
>> No, the domU keeps working, I think because all partitions are
>> already mounted when open-iscsi starts.
>
> I figured out why /dev/sda is assigned to the LUN. This is a part from
> the domU configurationfile:
>
> root    = '/dev/sda1 ro'
> disk    = [ 'phy:xen-images/loghost-disk,sda1,w',
> 'phy:xen-images/loghost-swap,sda2,w',
> 'phy:xen-images/loghost-remotelogs,sda3,w', '
> phy:xen-images/loghost-httplogs,sda4,w' ]
>
>
> As you can see, only sda1 through sda4 are used, but sda is
> not. Mystery solved.
>
> Step two: what to do next:
> 1. Alter configuration file and add a phony /dev/sda, so that udev
> will give my LUN (hopefully) another name
> 2. Alter complete setup: assign only a /dev/sda to the domU and
> partition it inside the domU
> 3. Configure the LUN as /dev/sda, hoping that partitions made on the
> LUN will not conflict with existing /dev/sda[1-4]
> 4. Figure out a way to have udev assign another name than /dev/sda (eg
> sd[b-z])
>
> Any suggestions? Are there best practices for a situation like this,
> or more in general: partitioning for domU?

5. Use xvda[1-4] in your config (and guest) instead of sda[1-4].  It's
   a simple renaming, and is also future-proof.
-- 
Cheers,
Feri.

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