<p dir="ltr"></p>
<p dir="ltr">On Sep 29, 2016 10:28 AM, "Evgheni Dereveanchin" <<a href="mailto:ederevea@redhat.com">ederevea@redhat.com</a>> wrote:<br>
><br>
> Hi,<br>
><br>
> Indeed the proposed dd test does not work on zRAM slaves.<br>
> Can we modify the job not to run on nodes with ram_disk label?</p>
<p dir="ltr">Are those zram based or ram based *virtio-blk* disks, or zram/ram disks within the VMs? <br>
The former should work. The latter - no idea. </p>
<p dir="ltr">><br>
> The node will be offline for now until we agree on what to do.<br>
> An option is to abandon RAM disks completely as we didn't find<br>
> any performance benefits from using them so far.</p>
<p dir="ltr">That's very surprising. On my case it doubles the performance, at least. But I assume my storage (single disk) is far slower than yours. <br>
Y. </p>
<p dir="ltr">><br>
> Regards,<br>
> Evgheni Dereveanchin<br>
><br>
> ----- Original Message -----<br>
> From: "Eyal Edri" <<a href="mailto:eedri@redhat.com">eedri@redhat.com</a>><br>
> To: "Nir Soffer" <<a href="mailto:nsoffer@redhat.com">nsoffer@redhat.com</a>>, "Evgheni Dereveanchin" <<a href="mailto:ederevea@redhat.com">ederevea@redhat.com</a>><br>
> Cc: "Yaniv Kaul" <<a href="mailto:ykaul@redhat.com">ykaul@redhat.com</a>>, "devel" <<a href="mailto:devel@ovirt.org">devel@ovirt.org</a>>, "infra" <<a href="mailto:infra@ovirt.org">infra@ovirt.org</a>><br>
> Sent: Thursday, 29 September, 2016 8:08:45 AM<br>
> Subject: Re: [ovirt-devel] [VDSM] All tests using directio fail on CI<br>
><br>
> Evgheni,<br>
> Can you try switching the current RAM drive with zram?<br>
><br>
> On Wed, Sep 28, 2016 at 11:43 PM, Nir Soffer <<a href="mailto:nsoffer@redhat.com">nsoffer@redhat.com</a>> wrote:<br>
><br>
> > On Wed, Sep 28, 2016 at 11:39 PM, Yaniv Kaul <<a href="mailto:ykaul@redhat.com">ykaul@redhat.com</a>> wrote:<br>
> > > On Sep 28, 2016 11:37 PM, "Nir Soffer" <<a href="mailto:nsoffer@redhat.com">nsoffer@redhat.com</a>> wrote:<br>
> > >><br>
> > >> On Wed, Sep 28, 2016 at 11:20 PM, Nir Soffer <<a href="mailto:nsoffer@redhat.com">nsoffer@redhat.com</a>><br>
> > wrote:<br>
> > >> > On Wed, Sep 28, 2016 at 10:31 PM, Barak Korren <<a href="mailto:bkorren@redhat.com">bkorren@redhat.com</a>><br>
> > >> > wrote:<br>
> > >> >> The CI setup did not change recently.<br>
> > >> ><br>
> > >> > Great<br>
> > >> ><br>
> > >> >> All standard-CI jobs run inside mock (chroot) which is stored on top<br>
> > >> >> of a regular FS, so they should not be affected by the slave OS at<br>
> > all<br>
> > >> >> as far as FS settings go.<br>
> > >> >><br>
> > >> >> But perhaps some slave-OS/mock-OS combination is acting strangely, so<br>
> > >> >> could you be more specific and point to particular job runs that<br>
> > fail?<br>
> > >> ><br>
> > >> > This jobs failed, but it was deleted (I get 404 now):<br>
> > >> > <a href="http://jenkins.ovirt.org/job/vdsm_master_check-patch-fc24-">http://jenkins.ovirt.org/job/vdsm_master_check-patch-fc24-</a><br>
> > x86_64/2530/<br>
> > >><br>
> > >> Oops, wrong build.<br>
> > >><br>
> > >> This is the failing build:<br>
> > >><br>
> > >><br>
> > >> <a href="http://jenkins.ovirt.org/job/vdsm_master_check-patch-el7-">http://jenkins.ovirt.org/job/vdsm_master_check-patch-el7-</a><br>
> > x86_64/1054/console<br>
> > >><br>
> > >> And this is probably the reason - using a ram disk:<br>
> > >><br>
> > >> 12:24:53 Building remotely on <a href="http://ovirt-srv08.phx.ovirt.org">ovirt-srv08.phx.ovirt.org</a> (phx physical<br>
> > >> integ-tests ram_disk fc23) in workspace<br>
> > >> /home/jenkins/workspace/vdsm_master_check-patch-el7-x86_64<br>
> > >><br>
> > >> We cannot run the storage tests using a ramdisk. We are creating<br>
> > >> (tiny) volumes and storage domains and doing copies, this code cannot<br>
> > >> work with ramdisk.<br>
> > ><br>
> > > Will it work on zram?<br>
> > > What if we configure ram based iSCSI targets?<br>
> ><br>
> > I don't know, but it is easy to test - it this works the tests will work:<br>
> ><br>
> > dd if=/dev/zero of=file bs=512 count=1 oflag=direct<br>
> > _______________________________________________<br>
> > Infra mailing list<br>
> > <a href="mailto:Infra@ovirt.org">Infra@ovirt.org</a><br>
> > <a href="http://lists.ovirt.org/mailman/listinfo/infra">http://lists.ovirt.org/mailman/listinfo/infra</a><br>
> ><br>
> ><br>
> ><br>
><br>
><br>
> --<br>
> Eyal Edri<br>
> Associate Manager<br>
> RHV DevOps<br>
> EMEA ENG Virtualization R&D<br>
> Red Hat Israel<br>
><br>
> phone: +972-9-7692018<br>
> irc: eedri (on #tlv #rhev-dev #rhev-integ)<br></p>