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<div class="moz-cite-prefix">On 3/29/21 12:47 PM, Reid Wahl wrote:<br>
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<div dir="ltr" class="gmail_attr">On Mon, Mar 29, 2021 at 3:35
AM Ulrich Windl <<a
href="mailto:Ulrich.Windl@rz.uni-regensburg.de"
moz-do-not-send="true">Ulrich.Windl@rz.uni-regensburg.de</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">>>> d tbsky <<a
href="mailto:tbskyd@gmail.com" target="_blank"
moz-do-not-send="true">tbskyd@gmail.com</a>> schrieb am
29.03.2021 um 04:01 in Nachricht<br>
<CAC6SzHLi0ufVhE3RM57e2V=<a
href="mailto:t_mOmL5ECX8AY3gtcfGmOfKDaxg@mail.gmail.com"
target="_blank" moz-do-not-send="true">t_mOmL5ECX8AY3gtcfGmOfKDaxg@mail.gmail.com</a>>:<br>
> Hi:<br>
> since the vm start/stop at once will consume disk
IO, I want to<br>
> start/stop the vm<br>
> one‑by‑one with delay.<br>
<br>
I'm surprised that in these days of fast disks and SSDs this
is still an<br>
issue.<br>
Maybe don't delay the start, but limit concurrent starts.<br>
Or maybe add some weak ordering between the VMs.<br>
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<div>kind=Serialize does this. It makes the resources start
consecutively, in no particular order. I added the comment
about ocf:heartbeat:Delay because D mentioned wanting a
delay... but I don't see why it would be necessary, if
Serialize is used.<br>
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Wasn't the reason behind all of that the fact that VMs claim to be
started<br>
once the hypervisor is running (at least without any additional
measures)<br>
and that as a consequence starting them serialized wouldn't change
much -<br>
hence the delay (or something more elaborate that actually detects
when<br>
services in a VM are mostly up and not imposing lots of IO or
whatever<br>
load anymore).<br>
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<br>
> <br>
> search the email‑list I found the discussion<br>
> <a
href="https://oss.clusterlabs.org/pipermail/pacemaker/2013"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://oss.clusterlabs.org/pipermail/pacemaker/2013</a>‑August/043128.html
<br>
> <br>
> now I am testing rhel8 with pacemaker 2.0.4. I
wonder if there are<br>
> new methods to solve the problem. I search the document
but didn't<br>
> find new parameters for the job.<br>
> <br>
> if possible I don't want to modify VirtualDomain RA
which comes<br>
> with standard rpm package. maybe I should write a new
RA which stagger<br>
> the node utilization. but if I reset the node
utilization when cluster<br>
> restart, there maybe a race condition.<br>
> <br>
> thanks for help!<br>
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<div>Regards,<br>
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Reid Wahl, RHCA<br>
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<div>Senior Software Maintenance
Engineer, Red Hat<br>
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CEE - Platform Support Delivery -
ClusterHA</div>
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