[ClusterLabs] how to disable pacemaker throttle mode

[Vladislav Bogdanov]

IIRC, there is one issue with that, is that IO load is considered a CPU 
load, so on busy storage servers you get throttling with almost free CPU. I 
may be wrong that load is calculated from loadavg, which is a different 
story at all, as it indicates the number of processes which are ready to 
consume the CPU time, including those waiting for IOs to complete, but that 
is what my mind recalls.

I easily get loadavg of 128 on iscsi storage servers with almost free CPU, 
no thermal reaction at all.

Best,
Vlad

On February 5, 2024 19:22:11 Ken Gaillot <kgaillot at redhat.com> wrote:

> On Mon, 2024-02-05 at 18:08 +0800, hywang via Users wrote:
>> hello, everyone:
>>     Is there any way to disable pacemaker throttle mode. If there is,
>> where to find it?
>> Thanks!
>>
>
> You can influence it via the load-threshold and node-action-limit
> cluster options.
>
> The cluster throttles when CPU usage approaches load-threshold
> (defaulting to 80%), and limits the number of simultaneous actions on a
> node to node-action-limit (defaulting to twice the number of cores).
>
> The node action limit can be overridden per node by setting the
> PCMK_node_action_limit environment variable (typically in
> /etc/sysconfig/pacemaker, /etc/default/pacemaker, etc. depending on
> distro).
> --
> Ken Gaillot <kgaillot at redhat.com>
>
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