Re: [Xen-users] iSCSI target - run in Dom0 or DomU?

[Matthew Wild <M.Wild@xxxxxxxx>]

On Friday 25 August 2006 14:49, Jason wrote:
> I wonder, instead of drdb, what would happen if you exported both
> storage servers iscsi targets to your xen machines and then used linux
> software raid1 to mount them both and keep them in sync.
>
You'd end up with a management nightmare. Which dom0 would be maintaining the 
RAID set? And you'd have to keep an eye on all the RAID configurations for 
each virtual machines disk(s) on every dom0. You would also be trying to 
write to both storage servers at the same time and that's not possible with 
drbd.

Part of the point is to make the Xen servers as simple as possible, and 
therefore interchangeable/replaceable, with little extra configuration to 
support. Eventually I would expect to use drbd 8.0 on the storage servers, 
giving primary/primary access, and use multipath-tools allowing me to 
dispense with heartbeat on the storage servers.

Matthew
-- 
Matthew Wild                       Tel.: +44 (0)1235 445173
M.Wild@xxxxxxxx                    URL http://www.ukssdc.ac.uk/
UK Solar System Data Centre and
World Data Centre - Solar-Terrestrial Physics, Chilton
Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX

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