On April 5, 2020 6:39:43 PM GMT+03:00, Martin Sivak <msi...@redhat.com> wrote:
>On Sun, Apr 5, 2020 at 4:07 PM Strahil Nikolov <hunter86...@yahoo.com>
>wrote:
>>
>> On April 5, 2020 3:36:42 PM GMT+03:00, "Maton, Brett"
><mat...@ltresources.co.uk> wrote:
>> >I've got a cluster made up of five physical hosts, (Dells with idrac
>7
>> >management)
>> >Power management / fencing enabled on all hosts.
>> >
>> >I've enabled the power_saving scheduling policy on my cluster, it's
>> >migrated all the VM's to a couple of physical hosts so three are
>> >sitting
>> >idle with no VM's.
>> >
>> >Shouldn't the power_saving policy shut down the idle hosts?
>>
>> I don't think so...
>
>On the contrary, it will shut down unneeded hosts indeed. But you have
>to configure the fields Liran mentioned:
>
>Edit the cluster, select scheduling policy tab and add two parameters
>to your Power saving policy. One (EnableAutomaticHostPowerManagement)
>enables the power cycling mechanism and the second one
>(HostsInReserve) controls how many empty hosts are allowed to stay up.
>When the not enough hosts are empty anymore a new one will be started.
>
>Best regards
>
>--
>Martin Sivak
>
>> But you can set a script to change the performance  profile of tuned
>daemon to adjust based on number of VMs.
>>
>> For example, if no VMs are running - tuned's power  saving profile is
>enabled,  while if a VM is powered  on (or migrated) - the script can
>put a high performance  peofile  is enabled.
>>
>>
>> Best Regards,
>> Strahil Nikolov
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Damn,

That's a great feature !

Best Regards,
Strahil Nikolov
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