On Wed, Sep 25, 2019 at 2:44 PM Tony Brian Albers <t...@kb.dk> wrote:
> Guys, > > Just for info, this is what I'm getting on a VM that is on shared > storage via NFSv3: > > --------------------------snip---------------------- > [root@proj-000 ~]# time dd if=/dev/zero of=testfile bs=4096 > count=1000000 > 1000000+0 records in > 1000000+0 records out > 4096000000 bytes (4.1 GB) copied, 18.0984 s, 226 MB/s > > real 0m18.171s > user 0m1.077s > sys 0m4.303s > [root@proj-000 ~]# > --------------------------snip---------------------- > > my /etc/exports: > /data/ovirt > *(rw,sync,no_subtree_check,all_squash,anonuid=36,anongid=36) > > and output from 'mount' on one of the hosts: > > sto-001.kac.lokalnet:/data/ovirt on /rhev/data-center/mnt/sto- > 001.kac.lokalnet:_data_ovirt type nfs > (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,soft,nolock, > nosharecache,proto=tcp,timeo=600,retrans=6,sec=sys,mountaddr=172.16.216 > .41,mountvers=3,mountport=20048,mountproto=udp,local_lock=all,addr=172. > 16.216.41) > Worth to compare mount options with the slow shared NFSv4 mount. Window size tuning can be found at bottom of [1], although its relating to NFSv3, it could be relevant to v4 as well. [1] https://www.ovirt.org/develop/troubleshooting-nfs-storage-issues.html > connected via single 10gbit ethernet. Storage on NFS server is 8 x 4TB > SATA disks in RAID10. NFS server is running CentOS 7.6. > > Maybe you can get some inspiration from this. > > /tony > > > > On Wed, 2019-09-25 at 09:59 +0000, Vrgotic, Marko wrote: > > Dear Strahil, Amit, > > > > Thank you for the suggestion. > > Test result with block size 4096: > > Network storage: > > avshared: > > [root@mpoludctest4udc-1 ~]# dd if=/dev/zero of=/tmp/test2.img bs=4096 > > count=100000 oflag=dsync > > 100000+0 records in > > 100000+0 records out > > 409600000 bytes (410 MB) copied, 275.522 s, 1.5 MB/s > > > > Local storage: > > > > avlocal2: > > [root@mpollocalcheck22 ~]# dd if=/dev/zero of=/tmp/test2.img bs=4096 > > count=100000 oflag=dsync > > 100000+0 records in > > 100000+0 records out > > 409600000 bytes (410 MB) copied, 53.093 s, 7.7 MB/s > > 10:38 > > avlocal3: > > [root@mpollocalcheck3 ~]# dd if=/dev/zero of=/tmp/test2.img bs=4096 > > count=100000 oflag=dsync > > 100000+0 records in > > 100000+0 records out > > 409600000 bytes (410 MB) copied, 46.0392 s, 8.9 MB/s > > > > As Amit suggested, I am also going to execute same tests on the > > BareMetals and between BareMetal and NFS to compare results. > > > > > > — — — > > Met vriendelijke groet / Kind regards, > > > > Marko Vrgotic > > > > > > > > > > From: Strahil <hunter86...@yahoo.com> > > Date: Tuesday, 24 September 2019 at 19:10 > > To: "Vrgotic, Marko" <m.vrgo...@activevideo.com>, Amit <abawer@redhat > > .com> > > Cc: users <users@ovirt.org> > > Subject: Re: [ovirt-users] Re: Super Low VM disk IO via Shared > > Storage > > > > Why don't you try with 4096 ? > > Most block devices have a blcok size of 4096 and anything bellow is > > slowing them down. > > Best Regards, > > Strahil Nikolov > > On Sep 24, 2019 17:40, Amit Bawer <aba...@redhat.com> wrote: > > have you reproduced performance issue when checking this directly > > with the shared storage mount, outside the VMs? > > > > On Tue, Sep 24, 2019 at 4:53 PM Vrgotic, Marko <M.Vrgotic@activevideo > > .com> wrote: > > Dear oVirt, > > > > I have executed some tests regarding IO disk speed on the VMs, > > running on shared storage and local storage in oVirt. > > > > Results of the tests on local storage domains: > > avlocal2: > > [root@mpollocalcheck22 ~]# dd if=/dev/zero of=/tmp/test2.img bs=512 > > count=100000 oflag=dsync > > 100000+0 records in > > 100000+0 records out > > 51200000 bytes (51 MB) copied, 45.9756 s, 1.1 MB/s > > > > avlocal3: > > [root@mpollocalcheck3 ~]# dd if=/dev/zero of=/tmp/test2.img bs=512 > > count=100000 oflag=dsync > > 100000+0 records in > > 100000+0 records out > > 51200000 bytes (51 MB) copied, 43.6179 s, 1.2 MB/s > > > > Results of the test on shared storage domain: > > avshared: > > [root@mpoludctest4udc-1 ~]# dd if=/dev/zero of=/tmp/test2.img bs=512 > > count=100000 oflag=dsync > > 100000+0 records in > > 100000+0 records out > > 51200000 bytes (51 MB) copied, 283.499 s, 181 kB/s > > > > Why is it so low? Is there anything I can do to tune, configure VDSM > > or other service to speed this up? > > Any advice is appreciated. > > > > Shared storage is based on Netapp with 20Gbps LACP path from > > Hypervisor to Netapp volume, and set to MTU 9000. Used protocol is > > NFS4.0. > > oVirt is 4.3.4.3 SHE. > > > > > > _______________________________________________ > > Users mailing list -- users@ovirt.org > > To unsubscribe send an email to users-le...@ovirt.org > > Privacy Statement: < > > _______________________________________________ > > Users mailing list -- users@ovirt.org > > To unsubscribe send an email to users-le...@ovirt.org > > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > > oVirt Code of Conduct: https://www.ovirt.org/community/about/communit > > y-guidelines/ > > List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/ > > message/7XYSFEGAHCWXIY2JILDE24EVAC5ZVKWU/ > -- > Tony Albers - Systems Architect - IT Development > Royal Danish Library, Victor Albecks Vej 1, 8000 Aarhus C, Denmark > Tel: +45 2566 2383 - CVR/SE: 2898 8842 - EAN: 5798000792142
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