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

[Nir Soffer]

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
>>>
>>
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