[Pacemaker] Questions about reasonable cluster size...

[Steven Dake]

On 10/20/2011 07:42 AM, Alan Robertson wrote:
> On 10/20/2011 03:11 AM, Proskurin Kirill wrote:
>> On 10/20/2011 03:15 AM, Steven Dake wrote:
>>> On 10/19/2011 01:50 PM, Alan Robertson wrote:
>>>> Hi,
>>>>
>>>> I have an application where having a 12-node cluster with about 250
>>>> resources would be desirable.
>>>>
>>>> Is this reasonable?  Can Pacemaker+Corosync be expected to reliably
>>>> handle a cluster of this size?
>>>>
>>>> If not, what is the current recommendation for maximum number of nodes
>>>> and resources?
> Steven Dake wrote:
> 
> We regularly test 16 nodes.  As far as resources go, Andrew could answer
> that.
> 
>>
>> I start to have problems with 10+ nodes. It`s heavly depended on
>> corosync configuration afaik. You should test it.
> This is somewhat different from Steven's comment.  Exactly what things
> did you have in mind for the corosync configuration that could either
> help or hurt with larger clusters?
> 
> Steven:  Proskurin seems to think that there are some particular things
> to watch out for in the Corosync configuration for larger clusters. 
> Does anything come to mind for you about this?
> 
> 

We do 16 node testing with token=10000 (10 seconds).  The rest of the
parameters autoconfigure.