Re: [Users] Is it possible to limit migration speed and number of concurrent migrations?

2013-12-01 Thread Dan Kenigsberg 
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
> > 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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Re: [Users] Is it possible to limit migration speed and number of concurrent migrations?

2013-11-29 Thread Itamar Heim 

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
 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.
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I thought we can control both the number of concurrent migrations and 
the bandwidth per migration which defaults to 30MB/s?

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Re: [Users] Is it possible to limit migration speed and number of concurrent migrations?

2013-11-29 Thread Dan Kenigsberg 
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
 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.
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[Users] Is it possible to limit migration speed and number of concurrent migrations?

2013-11-29 Thread Ernest Beinrohr 
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 , RHCE 
, RHCVA 
, LPIC 
, VCA , 
+421-2--6241-0360 , +421-903--482-603 

icq:28153343, skype:oernii-work , 
jabber:oer...@jabber.org


“For a successful technology, reality must take precedence over public 
relations, for Nature cannot be fooled.” Richard Feynman


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