[ovirt-users] 答复: How power-saving schedule policy applied?

[Martin Sivak]

> Set ‘HostInReserve’ to 0. Bingo, cloudstack03 goes down as expected.
>
> But when I launch a new VM I get an error popup dialog which inform me that there isn’t enough memory resource
> to start a new VM. Is it normal way that power saving mechanism works? Can’t power saving policy scheduling module
> wake up a host to launch VM automatically?
>

We decided against this. Booting a host can take a long time + there
is some time before our management agent reports in
and we can't wait that long when starting a VM. That is why we keep
the empty host in reserve. That way the VM can be
started immediately and the additional host's boot time does not
matter too much.

> Also, Is there any timeline base power saving policy I can apply? Like from 8’clock AM to 6’clock PM, 10 hosts up,
> 6’clock PM to next 8’clock AM, just keep 3 hosts alive.

We do not have UI for this, but it is easily done using cron and REST
API (either directly or using some SDK).
We were even working on it for a while, but it was put on backburner
since sysadmins know cron well and the UI would have to be limited
anyway.

Best regards

--
Martin Sivak
SLA / oVirt

On Tue, Jan 9, 2018 at 8:55 AM, Alex Shen <alex at bill-jc.com> wrote:
>
> Hi Martin, Karli
>
>
>
> Thank a lot for your help.
>
>
>
> According to your instruction, I added two parameters into cluster configuration, as below.
>
> 1)      enable power cycling mechanisms
>
> 2)      reserve one host standing by
>
> My test bed:
>
> 3 hosts which are real servers, cloudstack01/cloudstack03/cloudstack04.
>
> Heavy load on cloudstack01, 21 vms
>
> Light load on cloudstack03, 1 vms
>
> No thing on cloudstack04
>
>
>
> When I shut down the last vm on cloudstack03(because I can’t migrate it to cloudstack01, I guess the load is already exceeding the threshold), the cloudstack04 goes to ‘maintenance’ then goes to ‘down’ state. Yepp, POWER SAVING.
>
>
>
>
>
> I tried further test:
>
> Set ‘HostInReserve’ to 0. Bingo, cloudstack03 goes down as expected.
>
> But when I launch a new VM I get an error popup dialog which inform me that there isn’t enough memory resource to start a new VM. Is it normal way that power saving mechanism works? Can’t power saving policy scheduling module wake up a host to launch VM automatically?
>
>
>
> Also, Is there any timeline base power saving policy I can apply? Like from 8’clock AM to 6’clock PM, 10 hosts up, 6’clock PM to next 8’clock AM, just keep 3 hosts alive.
>
>
>
> Best regards
>
> Alex
>
>
>
>
>
> 发件人: Martin Sivak [mailto:msivak at redhat.com]
> 发送时间: 2018年1月8日 19:43
> 收件人: Karli Sjöberg <karli at inparadise.se>
> 抄送: Alex Shen <alex at bill-jc.com>; users <users at ovirt.org>
> 主题: Re: [ovirt-users] How power-saving schedule policy applied?
>
>
>
> Hi,
>
>
>
> and here is a fresh screenshot just for you :)
>
>
>
> You need to edit the cluster, select scheduling policy tab and add two parameters to your Power saving policy. One enables the power cycling mechanisms and the second one (HostsInReserve) controls how many empty hosts are allowed to stay up. When the host is not empty anymore a new one will be started.
>
>
>
> Best regards
>
>
>
> --
>
> Martin Sivak
>
> SLA / oVirt
>
>
>
> On Mon, Jan 8, 2018 at 12:29 PM, Karli Sjöberg <karli at inparadise.se> wrote:
>
>
>
>
>
> Den 8 jan. 2018 12:07 skrev Alex Shen <alex at bill-jc.com>:
>
> Hi,
>
>
>
> I’m wondering how to apply power-saving schedule in ovirt cluster(version is 4.2.0.2-1.el7.centos)? Is there any instruction or manual with UI snapshots guidance? That will be appreciated.
>
>
>
> I’ve configed all host with ipmilan protocol and test ok. I suppose that power saving policy should converge VMs into hosts one by one. Something like that. From the beginning, all hosts are in ‘power off’ state, if a VM launch, power saving scheduling module should power on one host, and assign VM into that host. With many VMs activated, exceeding the threshold, power saving scheduling module should turn on another host…
>
>
>
> Jepp, that's basically how it works:)
>
>
>
> /K
>
>
>
>
>
> If anyone had played power saving scheduling policy, please share me your scenarios or some hints. Thanks a lot.
>
>
>
> Alex
>
>
>
> 无病毒。www.avast.com
>
>
>
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