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

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@immobiliare.it] Sent: Monday, February 13, 2017 10:05 AM To: Andrea Ghelardi <a.ghelardi(a)iontrading.com>; users(a)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@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