[Pacemaker] newbie question(s)

[Digimer]

On 05/24/2013 11:24 AM, Nick Khamis wrote:
> Was there not a time where corosync was a subset of OpenAIS? Namely,
> openais support for active/active and passive/active? I might have my
> channels mixed up, it's been a while....
>
> @#linux-cluster and #linux-ha: Will do.
>
> Ninus Khamis (PhD)
>
> PS Sorry for the hijack!!!!
>

Nope. Until RHEL 5, openais was the communication layer of the cluster. 
However, the full AIS API was deemed "overkill" for what HA clustering 
needed, so corosync was created for RHEL 6 as a stripped-down, HA 
focused version of openais. In turn, openais was made a corosync plugin 
for those who actually want the full AIS API.

The concepts of "Active/Active", "Active/Passive", etc. is not a 
membership or cluster communication layer question. Those concepts come 
from the resource manager (rgmanager or pacemaker). More to the point, 
it's a per-resource question. You can have a pacemaker cluster where 
some services are Active/Active (ie: a GFS2 partition) while at the same 
time having an Active/Passive resouce (ie: a VM).

hth

digimer

-- 
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without 
access to education?