[ovirt-users] high number of IOPS from ovirt hosts

[Nir Soffer]

On Mon, Feb 13, 2017 at 12:32 PM, Andrea Fagiani <
andrea.fagiani at immobiliare.it> wrote:

> Hi Nir,
>
> the amount of IOPS is pretty much constant, attaching the logs from the
> last hour or so.
>

Andrea, can you send also logs from ovirt-hosted-engine-ha?
(I'm not sure about the name of the service or the location of the logs)


> Andrea
>
> On 13/02/2017 10:13, Nir Soffer wrote:
>
> On Mon, Feb 13, 2017 at 11:05 AM, Andrea Fagiani <
> andrea.fagiani at immobiliare.it> wrote:
>
>> Thanks for the heads up, I'll take a look at Mark's thread.
>> We are presenting 2 storage LUNs to a single ovirt cluster and yes, all
>> hosts are hosted engine hosts.
>>
>> Thanks,
>> Andrea
>
>
> I think we already have hosted engine bug about doing to many calls to vdsm
> that cause reloads of lvm data; this can cause increased io.
>
> Can you attach vdsm and hosted engine agent logs showing the timeframe
> when
> you have lot of iops on the server?
>
> Nir
>
>
>>
>>
>>
>> On 12/02/2017 18:27, Andrea Ghelardi wrote:
>>
>>> Andrea,
>>> I don't want to point any fingers but Mark Greenall faced some issues
>>> with Ovirt 4.06/4.1 linked to equallogic as well.
>>> You may want to search posts in this ML with subject " Ovirt 4.0.6
>>> guests 'Not Responding' " to see if you find any similarities.
>>> How many storages are you presenting to how many clusters?
>>> Also, are your nodes all Hosted Engine Hosts? In my old configuration,
>>> normal hosts read IOPS ranged from 50 to 500 while HE ones peaked even ~3000
>>> Cheers
>>> AG
>>>
>>>
>>> -----Original Message-----
>>> From: Andrea Fagiani [mailto:andrea.fagiani at immobiliare.it]
>>> Sent: Friday, February 10, 2017 5:56 PM
>>> To: Andrea Ghelardi <a.ghelardi at iontrading.com>; users at ovirt.org
>>> Subject: Re: [ovirt-users] high number of IOPS from ovirt hosts
>>>
>>> Hi Andrea,
>>>
>>> thanks for the insight; no I wasn't able to pinpoint the issue to a
>>> single host, the load seems to be evenly spread.
>>> We have another cluster running 4.0.6 on a compellent as well and we
>>> haven't experienced any similar issues.
>>>
>>> Thanks,
>>> Andrea
>>>
>>>
>>> On 10/02/2017 17:17, Andrea Ghelardi wrote:
>>>
>>>> Hello Andrea,
>>>> I saw that happening on my HE hosts connected to a COMPELLENT SC040
>>>> when I was running Ovirt 3.5
>>>>
>>>> All HE hosts were hammering the SAN with 2~4k IOPS each
>>>>
>>>> Upgrading to 4.0.5 solved my case.
>>>> Are you able to check if IOPS are generated from a particular host or
>>>> rather spread among all nodes?
>>>>
>>>> Cheers
>>>> AG
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: users-bounces at ovirt.org [mailto:users-bounces at ovirt.org] On
>>>> Behalf Of Andrea Fagiani
>>>> Sent: Friday, February 10, 2017 12:47 PM
>>>> To: users at ovirt.org
>>>> Subject: [ovirt-users] high number of IOPS from ovirt hosts
>>>>
>>>> Hi,
>>>>
>>>> We've got a 8-host cluster running oVirt 4.1; each host is connected
>>>> via iscsi to a EQL 4100 storage (2x).
>>>> Most of the VMs use barely any IOPS, however on our storage controller
>>>> we've noticed a constant steam of reads, about 2000 IOPS; any idea what
>>>> might cause the ovirt hosts to hammer on the storage so much?
>>>>
>>>> Looking at iotop, it seems that systemd-udevd is being activated every
>>>> few seconds (and its IO% is usually fairly high) so I assume this might be
>>>> somehow related.
>>>>
>>>> Thanks,
>>>> Andrea
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>>
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20170213/180b645e/attachment.html>