[ClusterLabs] ?==?utf-8?q? Limit of concurrent ressources to start?
ms at sys4.de
Wed Jun 13 11:32:13 EDT 2018
Am 13.06.2018 um 16:18 schrieb Ken Gaillot:
> On Wed, 2018-06-13 at 14:25 +0200, Michael Schwartzkopff wrote:
>> On Wednesday, June 13, 2018 10:01 CEST, "Michael Schwartzkopff" <ms at s
>> ys4.de> wrote:
>>> we have a cluster with several IP addresses that can start after an
>>> other resource. In the logs we see that only 2 IP addresses start
>>> in parallel, not all. Can anyone please explain, why not all IP
>>> addresses start in parallel?
>>> primitive resProc ocf:myprovider:Proc
>>> (ten times:) primitive resIP1 ocf:heartbeat:IPaddr2 params
>>> order ord_Proc_IP Mandatory: resProc ( resIP1 resIP2 ... )
>>> collocation col_IP_Proc inf: (resIP1 resIP2 ...) resProc
>>> No batch-limit in properties.
>>> Any ideas? Thanks.
> Each node has a limit of how many jobs it can execute in parallel. In
> order of most preferred to least, it will be:
> * The value of the (undocumented) PCMK_node_action_limit environment
> variable on that node (no limit if not existing)
> * The value of the (also undocumented) node-action-limit cluster
> property (defaulting to 0 meaning no limit)
> * Twice the node's number of CPU cores (as reported by /proc/stat)
> Also, the cluster will auto-calculate a cluster-wide batch-limit if
> high load is observed on any node.
> So, you could mostly override throttling by setting a high node-action-
>> additional remark:
>> With some tweaks I made my cluster start two resources (i.e. IP1 and
>> IP2) at the same time. But it takes about 4 seconds to that the
>> cluster starts the next resources (i.e. IP3 and IP4).
>> Did anybody see this behaviour before?
>> Why does my cluster do not start all "parallel" resources together?
> Ken Gaillot <kgaillot at redhat.com>
Thanks for this clarification.
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