<font size=2 face="sans-serif">Russell, with powervm the hypervisor (IVM)
is running on a detached system and depending on how many compute nodes
are going through the same hypervisor I would think the load would vary
as it processes multiple requests. In my runs with Tempest I haven't
seen any timeouts in the power_off operation, but I have seen other problems
which are making me conscious of timeout issues with the powervm driver,
mainly around taking a snapshot of a running instance (but that's a different
issue related more to disk performance on the IVM and network topology
- still investigating).</font>
<br>
<br><font size=2 face="sans-serif">Honestly, I just don't like hard-coded
timeouts which can't be configured if the need arises. I don't know
why there is a timeout argument in the code that defaults to 30 seconds
if it can't be overridden (or is overridden in the code). We could
do like the libvirt driver and just not have a timeout on stop/start, but
that scares me for some reason.<br>
</font>
<br><font size=2 face="sans-serif"><br>
</font>
<br><font size=1 face="Arial">Thanks,</font>
<br>
<br><font size=3 color=#8f8f8f face="Arial"><b>MATT RIEDEMANN</b></font><font size=1 face="Arial"><br>
Advisory Software Engineer<br>
Cloud Solutions and OpenStack Development</font>
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<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">Russell Bryant <rbryant@redhat.com></font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">openstack-dev@lists.openstack.org,
</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">08/12/2013 09:49 AM</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">Re: [openstack-dev]
[nova] gauging feelings on a new config option for powervm_lpar_operation_timeout</font>
<br>
<hr noshade>
<br>
<br>
<br><tt><font size=2>On 08/11/2013 04:04 PM, Matt Riedemann wrote:<br>
> While working on a patch to implement hard reboot for the powervm
driver<br>
> [1], I noticed that the stop_lpar (power_off) method has a timeout<br>
> argument with a default value of 30 seconds but it's not overridden<br>
> anywhere in the code and it's not configurable. The start_lpar<br>
> (power_on) method doesn't have a timeout at all. I was thinking
about<br>
> creating a patch to (1) make start_lpar poll until the instance is<br>
> running and (2) making the stop/start timeouts configurable with a
new<br>
> config option, something like powervm_lpar_operation_timeout that<br>
> defaults to 60 seconds.<br>
<br>
Why would someone change this? What makes one person's environment
need<br>
a different timeout than another? If those questions have good answers,<br>
it's probably fine IMO.<br>
<br>
-- <br>
Russell Bryant<br>
<br>
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