Re: [Xen-users] remus vs. pacemaker/drbd?

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

> 
> Actually, pacemaker can do live migrations with some limitations. If the
> server on which the domU is running suddenly crashes, then domU does
> have to be booted from scratch on the other server. But if one server is
> taken down gracefully, Pacemaker can live migrate the domU (not
> instantaneous but only takes a few seconds). This does require that the
> domU disk images reside on shared storage though (NFS or a clustered
> file system like GFS or OCFS).

Right...my point was not to say that Pacemaker cannot do live migrations, but 
that Pacemaker does not keep a paused, up-to-date copy of the domU running 
somewhere else.  So, if a domU crashes, or becomes unavailable for some reason, 
Pacemaker has to start from scratch, so there is downtime.  Many folks can live 
with that, especially since, with decent server hardware, boot time of a domU 
is on the order of 10-30 seconds, depending on the services running on the 
domU.  Others, however, want zero downtime - Remus is designed to cover these 
situations.

-Nick




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