Re: [Xen-users] Linux-HA?

[Florian Tischler <flo_list2007@xxxxxxxx>]

Am Donnerstag, 7. Februar 2008 schrieb Rainer Sokoll:
> Hi,
>
> assumed I have several Linuxes running in their domUs and need a
> failover solution for every system. dom0 is also running Linux.
> What is the better way: Setting up HA only for the dom0, or setting up
> HA within every single domU?

Hi,

I am currently working on a xen based cluster. 2 nodes, Heartbeat in dom0, 
small domUs for every service. (Not exactly every service, one for web, one 
for mail, one for ldap, one for db and so on, about 10 domUs at all)

Linux-HA is keeping the domUs up and running. This is not failover of single 
services but entire domUs. The Xen resource script of Heartbeat can also 
monitor services of a domU and failover the entire domU if the service fails.
Next advantage is that Heartbeat can take care about memory assigned to the 
domUs. As example: In normal operation 5 domUs are running on each node using 
all memory, if one node goes down, all 10 domUs run on a single node, 
Heartbeat can do the xm mem-set for you so that all domUs fit to the 
remaining node.

So i would personally recommend running Linux-HA in DomU.

Florian

> Thanks,
> Rainer
>
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-- 
Florian Tischler
mailto:flo_list2007@xxxxxxxx
icq#11754147

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