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From Erik Weber <terbol...@gmail.com>
Subject Re: 2node HA ACS Cluster with DRBD
Date Wed, 23 Nov 2016 09:20:19 GMT
Could you elaborate a bit more about what you're trying to accomplish?

 At the look of it you seem to want something like this;
 - two nodes, doing both mgmt server and compute (kvm?)
 - replicated local storage for compute storage (with drbd)

Instead of doing replicated storage where only 1 node can use it - why not
set up a distributed one?
I believe there are a few ceph users here, glusterfs could possibly work.

But again, if you explain a bit more about the problem you're trying to
solve it'll be easier to help.

-- 
Erik

On Wed, Nov 23, 2016 at 1:05 AM, Jeroen Keerl <jeroen.keerl@keerl-it.com>
wrote:

> All,
>
>
>
> I’ve been pondering a bit about a possible small-scale, HA setup:
>
>
>
> Hardware
>
> 2 Nodes, each with 2 1Gbe and 2 10Gbe NICs
>
> Both have hardware RAID controllers, redundant PS, Array controller with
> BBWC and hot plug SAS drives.
>
>
>
> If we’d “combine” the quick setup for CentOS6 (
> http://docs.cloudstack.apache.org/projects/cloudstack-
> installation/en/4.9/qig.html ) with the “additional management server”
> part ( http://docs.cloudstack.apache.org/projects/cloudstack-
> installation/en/4.9/management-server/index.html#
> additional-management-servers ) then we’d have 2 management servers.
>
> To make the local storage of both nodes “HA”, one could use DRBD in a
> “primary-primary” setup, so VM migration is possible as well. (I am not yet
> clear on how to present this storage to the nodes)
>
>
>
> To avoid split brain-situations, I see two possible strategies:
>
> 1)      Direct cabling of the 10Gbe controllers => Loss of connection can
> only mean either one host is dead, or at least its NIC has died.
>
> 2)      Usage of IPMI / Fencing
>
>
>
> Did anybody gather experience in a setup like that?
>
> Does anybody have any thoughts on this – improvements, comments, doubts:
> Hit me!
>
>
>
> Cheers,
>
> JK
>
>
>
> ·         I came to this “setup”, after a few issues with Xen Server 6.5
> combined with “HA-Lizard”, which actually uses DRBD in combination with
> TGTD iSCSI. On the one side, I’ve had quite a few stability issues with Xen
> 6.5 and on the other side: The CS MS needs to be outside of this cluster …
> but still needs to be installed on a redundant / HA piece of kit.
>
>
>
>
>
>
> *Jeroen Keerl*
>
>
> *Keerl IT Services GmbH*Birkenstraße 1b . 21521 Aumühle
>
> +49 177 6320 317
>
> www.keerl-it.com
> info@keerl-it.com
>
> Geschäftsführer. Jacobus J. Keerl
> Registergericht Lubeck. HRB-Nr. 14511
>
> Unsere Allgemeine Geschäftsbedingungen finden Sie hier.
> <http://www.keerl-it.com/AGB.pdf>
>
>
>

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