[DRBD-user] Antwort: Three node cluster?

Bjorn Enroth bjorn.enroth at comnia.se
Mon Apr 16 11:12:48 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Hello Robert,

Thank you very much for the answer.

Hmm, I just love the way drbd is giving me LVM partitions to my virtual guests, but if it's not possible in a three node setup I might need to think different.
This is a development cluster, otherwise I would go for a real SAN solution anyway.

Thanks a lot
----------------------------------
Bjorn Enroth
bjorn.enroth at comnia.se
+46 8 53338400 (direct)
+46 70 3118400 (cell)

Comnia Internet AB
http://www.comnia.se
+46 8 55002540 (phone)
+46 8 55002541 (fax)

16 apr 2012 kl. 09:29 skrev Robert.Koeppl at knapp.com:

> 
> IIRC three active nodes are not supported by DRBD. 
> You will have to resort to a shared storage solution. I am not entirely sure if a NFS-Server managed by Pacemaker with a backing DRBD would be fast enough and how well KVM handles the outage in case of a failover of the Cluster. 
> In this Environment you would have two dedicated servers for the storage-cluster and combine them with a bunch of "pizzaboxes" that run the Virtual Machines in another pacemaker cluster. As a decent storage backend (bunch of 15k SAS-drives, Raid-controller+BBU) easily costs much more than those small servers you might even get away with about the same cost - depending on the number of disks you had planned for your cluster.
> Mit freundlichen Grüßen / Best Regards
> 
> Robert Köppl
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> 
> Björn Enroth <bjorn at comnia.com> 
> Gesendet von: drbd-user-bounces at lists.linbit.com
> 16.04.2012 09:09
> 
> An
> drbd-user at lists.linbit.com
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> Thema
> [DRBD-user] Three node cluster?
> 
> 
> 
> 
> 
> Guys, 
> I am looking for information of how to deal with a KVM three node cluster with DRBD 
> 
> I have a "baby machine" ubuntu 11.10 pacemaker/drbd cluster with two nodes, local disks with drbd setup in between. This is working flawless. 
> 
> My challenge now is that I want to add a third node with the same setup. How do I handle drbd in this setup? I'd like to have all nodes active, to be able to migrate resources, mainly kvm virtual guests, around the cluster as I see fit. I'd also like pacemaker to be able to dynamically handle the load. 
> 
> I've been surfing' around for a while... Either I am not able to find the right information, or it is so obvious how to handle this so I am missing the point somewhere. Or, in worst case, this is not possible and I need to enter another route to make this work as I want. 
> 
> Any ideas? 
> 
> Thanks a lot in advance for your patience with me  
> 
> 
> 
> 
> 
> -------------------
> Björn Enroth
> Comnia Internet AB
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