This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


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

To: <xen-users@xxxxxxxxxxxxxxxxxxx>, "Greg Woods" <woods@xxxxxxxx>
Subject: Re: [Xen-users] remus vs. pacemaker/drbd?
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Tue, 07 Sep 2010 10:38:37 -0600
Delivery-date: Tue, 07 Sep 2010 09:41:21 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> 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 


This e-mail may contain confidential and privileged material for the sole use 
of the intended recipient.  If this email is not intended for you, or you are 
not responsible for the delivery of this message to the intended recipient, 
please note that this message may contain SEAKR Engineering (SEAKR) 
Privileged/Proprietary Information.  In such a case, you are strictly 
prohibited from downloading, photocopying, distributing or otherwise using this 
message, its contents or attachments in any way.  If you have received this 
message in error, please notify us immediately by replying to this e-mail and 
delete the message from your mailbox.  Information contained in this message 
that does not relate to the business of SEAKR is neither endorsed by nor 
attributable to SEAKR.

Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>