Xen users - Apr 2007 - Questions related to iSCSI storage for DomU

Hi,

I''ve two questions related to the use of a shared iSCSI storage for the
DomU disk and swap block devices:

The first. When we use iSCSI (or other kind of network shared storage) for
the domU disks, is recommended to use it for the swap partition too? I
think that maybe is better to use a local swap partition for better
performance but I don''t know if live migration could be possible if the
swap isn''t in the network storage, I think it''s needed to have
disk and
swap in the shared storage, is this correct?

The second. Which is the best method to get persistent device names for
the domU disk and swap block devices? I think that the use of
/dev/disk/by-path or /dev/disk/by-uuid symbolic links is a good and clean
way to get it, but maybe  there''s a better way. The udev tricks
didn''t
like so much... which is the most popular way to get it?

Thanks.

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On 4/6/07, Angel Lopez <angel@futur3.com> wrote:
> I''ve two questions related to the use of a shared iSCSI storage
for the
> DomU
I believe the general consensus is to use iSCSI in dom0, not in domU.
It''s been discussed before...

jerry

-- 
"Oh joy! Rapture! I''ve got a brain"
-Scarecrow

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Hi,

2007/4/7, Jerry Amundson <jamundso@gmail.com>:
>
> On 4/6/07, Angel Lopez <angel@futur3.com> wrote:
> > I''ve two questions related to the use of a shared iSCSI
storage for the
> > DomU

i use scsidev to generate persistent dev nodes.
http://www.garloff.de/kurt/linux/scsidev/

regards Martin


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Hi Jerry,
>> I''ve two questions related to the use of a shared iSCSI
storage for the
>> DomU
>
> I believe the general consensus is to use iSCSI in dom0, not in domU.
> It''s been discussed before...
Yes, I''ve my iSCSI initiator configured in Dom0 not in DomU. But in my
message I was asking about having the swap partition of DomU in the
network storage or in the local Dom0 and about persistent iSCSI names for
the DomU devices.

Thanks.


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> >> I''ve two questions related to the use of a shared iSCSI
storage for the
> >> DomU
> >
> > I believe the general consensus is to use iSCSI in dom0, not in domU.
> > It''s been discussed before...
> 
> Yes, I''ve my iSCSI initiator configured in Dom0 not in DomU. But
in my
> message I was asking about having the swap partition of DomU in the
> network storage or in the local Dom0 and about persistent iSCSI names for
> the DomU devices.
I can''t remember if this portion was answered, but you''d need
to have
the swap in network storage: otherwise, a domU could swap stuff out to
storage, then be migrated to another host and not be able to access the
stuff it''d swapped out.  So swap needs to always be available.

Cheers,
Mark


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Hi Mark,
> I can''t remember if this portion was answered, but you''d
need to have
> the swap in network storage: otherwise, a domU could swap stuff out to
> storage, then be migrated to another host and not be able to access the
> stuff it''d swapped out.  So swap needs to always be available.
Yes, thanks.

Un saludote.

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