Re: [Xen-users] Xen and iSCSI

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Jan 30, 2006 at 12:47:50AM +0100, Markus Hochholdinger wrote:
> Hi,
> 
> Am Sonntag, 29. Januar 2006 22:04 schrieb Pasi Kärkkäinen:
> [..]
> > In fact, even better would be to do the RAID in the storage arrays /
> > servers (=iSCSI targets), and provide multiple paths to the targets.. using
> > separate network (switch) for both paths.
> > In the dom0 you would only set up multipath device to the shared RAID array
> > (over iSCSI), and then create CLVM on top of that. No need to do the RAID
> > in dom0 :)
> 
> and if the backplane of the storage server dies? Or just the hard disk 
> controller in the storage? I'd like to have no signle point of failure :-)
> 

Well, make them double.

Use two target boxes, use DRBD or similar to sync the data between the boxes, 
and 
hearbeat to do failover (high-availability) between the boxes (iSCSI targets). 

http://www.pcpro.co.uk/realworld/82284/san-on-the-cheap.html

Tutorial there.

No need to have single point of failure :)

And now, you only need to have multipath setup in dom0, all the RAID stuff
is in the storage server. And all the volumes (in CLVM) are visible to all
the xen hosts.. so you can easily migrate domU's from host to another, and
the domU's know nothing about the underlying LVM/iSCSI/SAN/RAID.

-- Pasi

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