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

[Andrea Fagiani]

Indeed, deploying a few hosts without the hosted engine immediately 
resulted in a noticeable decrease in IOPS; thanks a lot for the help, 
now we can figure out a way to work around the issue.

Thanks,
Andrea


On 13/02/2017 10:43, Andrea Ghelardi wrote:
> Andrea,
> Among other advices, I would also suggest you to re-deploy an host without make it an host-engine node.
> It may be worth checking if HE service is responsible of so many IOPS as it was in my case.
> Ciao
> AG
>
> -----Original Message-----
> From: Andrea Fagiani [mailto:andrea.fagiani at immobiliare.it]
> Sent: Monday, February 13, 2017 10:05 AM
> To: Andrea Ghelardi <a.ghelardi at iontrading.com>; users at ovirt.org
> Subject: Re: [ovirt-users] high number of IOPS from ovirt hosts
>
> 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
>
>
> 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
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