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

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.

On Mon, Feb 13, 2017 at 11:05 AM, Andrea Fagiani <andrea.fagiani(a)immobiliare.it&gt; 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

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@immobiliare.it] >> Sent: Friday, February 10, 2017 5:56 PM >> To: Andrea Ghelardi <a.ghelardi(a)iontrading.com>; users(a)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(a)ovirt.org [mailto:users-bounces@ovirt.org] On >>> Behalf Of Andrea Fagiani >>> Sent: Friday, February 10, 2017 12:47 PM >>> To: users(a)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(a)ovirt.org >>> http://lists.ovirt.org/mailman/listinfo/users > > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users