Re: [Xen-users] HA Xen on 2 servers!! No NFS, special hardware, DRBD or iSCSI...

[Javier Guerra <javier@xxxxxxxxxxx>]

On Wednesday 07 June 2006 7:33 am, Eric Windisch wrote:
> I have been thinking of testing NBD for a similar setup, instead of
> AoE.  My understanding is that NBD natively supports raid-1 mirroring
> with logic particularly useful for RAID-over-TCP.  That is, during a

i think you're mixing NBD and DRBD.

as i see it, DRBD lets you have two block devices, each one on it's own box, 
and maintain them as mirrors.  any modification on one gets propagated to the 
other one.  now, if you want to make that "RAID1" available to a third box 
(and a fourth, fifth, etc) it's usually shared with GNBD (but it could be 
AoE, iSCSI, ieee 1394, anything).

to Chris: yes, you could get what you want, just make a big data disk (or 
partition, or LVM PV) 'mirrored' with DRBD, and use that for the DomU's 
storage.  you'll get live migration if the backing storage is name-equivalent 
on both boxes (easy to do with LVM).  if one hangs up, just reboot it on the 
other box.


-- 
Javier

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