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

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, "Miles Fidelman" <mfidelman@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] remus vs. pacemaker/drbd?
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Tue, 07 Sep 2010 09:28:28 -0600
Delivery-date: Tue, 07 Sep 2010 08:30:47 -0700
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It's worth noting that these are slightly different solutions.  Remus keeps a 
running (but paused), completely synchronized version of your domU(s), and, 
when it senses that the original domU is not available, unpauses the standby 
domU from it's last synchronized state.  This is really any extension of live 
migration, as remus is just continually live migrating your memory and disk 
data, but never shuts down the original or unpauses the standby version unless 
something happens to the original.  Pacemaker/DRBD, on the other hand, just 
synchronizes the data, and if it detects that one of the domUs has died, starts 
it up somewhere else.  So, with Remus, the theory/goal is 0 downtime of your 
domU, whereas Pacemaker simply minimizes downtime to a certain point - the time 
it takes to detect failure and boot the new domU.


>>> On 2010/09/06 at 15:40, Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx> wrote: 
> Hi Folks,
> Anybody have any experience and/or opinions re. Remus vs. Pacemaker/DRBD 
> as a high-availability solution for a very small cluster (2 machines)?
> Thanks,
> Miles Fidelman

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