4:49 a.m.
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I want to put some of my hvs to maintenance, but that causes a migration
storm, which causes an temporary unavailability of the hv and ovirt
fences it, while migrations are still running.
So I have to migrate one-by-one manually and then put the hv to maintenance.
Is it possible to limit migration speed and number of concurrent migrations?
--
Ernest Beinrohr, AXON PRO
DevOps, Ing <http://www.beinrohr.sk/ing.php>;, RHCE
<http://www.beinrohr.sk/rhce.php>;, RHCVA
<http://www.beinrohr.sk/rhce.php>;, LPIC
<http://www.beinrohr.sk/lpic.php>;, VCA <http://www.beinrohr.sk/vca.php>;,
+421-2--6241-0360 <callto://+421-2--6241-0360>, +421-903--482-603
<callto://+421-903--482-603>
icq:28153343, skype:oernii-work <callto://oernii-work>,
jabber:oernii@jabber.org
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For a successful technology, reality must take precedence over public
relations, for Nature cannot be fooled. Richard Feynman
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I want to put some of my hvs to maintenance, but that causes a
migration storm, which causes an temporary unavailability of the hv
and ovirt fences it, while migrations are still running.<br>
<br>
So I have to migrate one-by-one manually and then put the hv to
maintenance.<br>
<br>
Is it possible to limit migration speed and number of concurrent
migrations?<br>
<br>
<div class="moz-signature">-- <br>
<div id="oernii_footer" style="color: gray;">
<span style="font-family: Lucida Console, Luxi Mono, Courier,
monospace; font-size: 90%;">
Ernest Beinrohr, AXON PRO<br>
DevOps,
<a style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/ing.php">Ing</a>, <a
style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/rhce.php">RHCE</a>, <a
style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/rhce.php">RHCVA</a>, <a
style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/lpic.php">LPIC</a>, <a
style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/vca.php">VCA</a>, <a
style="text-decoration: none; color: gray;"
href="callto://+421-2--6241-0360">+421-2--6241-0360</a>,
<a
style="text-decoration: none; color: gray;"
href="callto://+421-903--482-603">+421-903--482-603</a><br>
icq:28153343, <a style="text-decoration: none; color: gray;"
href="callto://oernii-work">skype:oernii-work</a>,
<a class="moz-txt-link-abbreviated"
href="mailto:jabber:oernii@jabber.org">jabber:oernii@jabber.org</a>
<br>
</span>
<hr style="height: 1px; width: 95%"> <span
style="font-size:
70%;">
For a successful technology, reality must take precedence
over public relations, for Nature cannot be fooled. Richard
Feynman </span> </div>
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6:08 a.m.
On Fri, Nov 29, 2013 at 11:49:05AM +0100, Ernest Beinrohr wrote:
I want to put some of my hvs to maintenance, but that causes a
migration storm, which causes an temporary unavailability of the hv
and ovirt fences it, while migrations are still running.
So I have to migrate one-by-one manually and then put the hv to maintenance.
Is it possible to limit migration speed and number of concurrent migrations?
You could set max_outgoing_migrations to 1 (in each
/etc/vdsm/vdsm.conf), but even a single VM migrating may choke your
connection (depends which wins, the CPU running qemu, or your
bandwidth).
Currently, your only option is to define a migration network for your
cluster (say, over a different nic, or over a vlan), and use tools
external to ovirt to throtle the bandwidth on it (virsh net-edit
<network name> and http://libvirt.org/formatnetwork.html#elementQoS can
come up handy). ovirt-3.4 should expose the ability to set QoS limits on
migration networks.
Dan.
4:25 p.m.
On 11/29/2013 02:08 PM, Dan Kenigsberg wrote:
On Fri, Nov 29, 2013 at 11:49:05AM +0100, Ernest Beinrohr wrote:
> I want to put some of my hvs to maintenance, but that causes a
> migration storm, which causes an temporary unavailability of the hv
> and ovirt fences it, while migrations are still running.
>
> So I have to migrate one-by-one manually and then put the hv to maintenance.
>
> Is it possible to limit migration speed and number of concurrent migrations?
You could set max_outgoing_migrations to 1 (in each
/etc/vdsm/vdsm.conf), but even a single VM migrating may choke your
connection (depends which wins, the CPU running qemu, or your
bandwidth).
Currently, your only option is to define a migration network for your
cluster (say, over a different nic, or over a vlan), and use tools
external to ovirt to throtle the bandwidth on it (virsh net-edit
<network name> and http://libvirt.org/formatnetwork.html#elementQoS can
come up handy). ovirt-3.4 should expose the ability to set QoS limits on
migration networks.
Dan.
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
I thought we can control both the number of concurrent migrations and
the bandwidth per migration which defaults to 30MB/s?
4:54 p.m.
On Sat, Nov 30, 2013 at 12:25:31AM +0200, Itamar Heim wrote:
On 11/29/2013 02:08 PM, Dan Kenigsberg wrote:
>On Fri, Nov 29, 2013 at 11:49:05AM +0100, Ernest Beinrohr wrote:
>>I want to put some of my hvs to maintenance, but that causes a
>>migration storm, which causes an temporary unavailability of the hv
>>and ovirt fences it, while migrations are still running.
>>
>>So I have to migrate one-by-one manually and then put the hv to maintenance.
>>
>>Is it possible to limit migration speed and number of concurrent migrations?
>
>You could set max_outgoing_migrations to 1 (in each
>/etc/vdsm/vdsm.conf), but even a single VM migrating may choke your
>connection (depends which wins, the CPU running qemu, or your
>bandwidth).
>
>Currently, your only option is to define a migration network for your
>cluster (say, over a different nic, or over a vlan), and use tools
>external to ovirt to throtle the bandwidth on it (virsh net-edit
><network name> and http://libvirt.org/formatnetwork.html#elementQoS can
>come up handy). ovirt-3.4 should expose the ability to set QoS limits on
>migration networks.
>
I thought we can control both the number of concurrent migrations
and the bandwidth per migration which defaults to 30MB/s?
You are perfectly right: I forgot about 'migration_max_bandwidth', which
vdsm sets to 32MiBps (per single migration).
Sorry for misleading the list and its archives.
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3 comments
3 participants
participants (3)
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Dan Kenigsberg -
Ernest Beinrohr -
Itamar Heim