On Thu, 2014-10-23 at 10:11 +0200, Arman Khalatyan wrote: > > ---------- Forwarded message ---------- > From: Arman Khalatyan <[email protected]> > Date: Thu, Oct 23, 2014 at 10:11 AM > Subject: Re: [ovirt-users] Are there some general strategyhow to Iscsi > strorage domain? > To: Trey Dockendorf <[email protected]> > > > Thank you Trey for sharing your setup. > > I have also one test system with zvol exported with iscsi over 10G. > Unfortunately the difference in performance of zfs over raid > controller is huge, particularly where VM running mysql. I did not try > HBAs yet, I have only LSI/Adaptec/Areca RaidControllers they dont have > IT mode. Maybe that can be the reason. > > For sure always one need to find the sweet edge between performance > and reliability. > > Just for comparison with yours I get on random IO: > zvol/16Disks/Raid2/tgtd/iscsi/10G-> on VM multiple rsync - > ~100-150MB/s, Same HW but disks with Areca RAID6 - 650MB/s stable > even more in some cases.
Did you have separate log devices attached to the pool? The pool´s name was '16Disks'. Did you have 16 disks in one radiz2 vdev? /K > > The best performance I got on FDR iser-> > 80% of bare metal performance: 1500MB/s but ovirt goes mad claiming > that Network and Disk devices are saturated. My VM goes time by time > to paused state. > It is due to that the Ovirt treating all ib devices as 10Gbit > cards(in terms of speed).:( > > > > > > > On Thu, Oct 23, 2014 at 8:30 AM, Trey Dockendorf <[email protected]> > wrote: > Not sure if it's a solution for you, but ZFS. My domains are > all ZFS (using ZFS on Linux in EL6.5) and my backup server > receives incremental snapshots from primary storage which > includes both NFS exports and iSCSI. ZFS makes creating block > devices for iSCSI very easy, and they are included in snapshot > replication. The replication is not HA but disaster recovery > and off site. > > I've hit 300MB/s using ZFS send over IPoIB on my DDR fabric, > which isn't amazing but not terrible for an old DDR fabric. > > ZFS is probably not an easy solution as requires rebuilding > your storage, but maybe for future use or other readers it > will give some useful ideas. > > - Trey > > On Oct 22, 2014 11:56 AM, "Arman Khalatyan" > <[email protected]> wrote: > > Hi, > I have 2x40TB domains each are exported with > iser/iscsi with ib and 10Gb interfaces. > > For sure they are RAID6 storage little bit save on > failure. > But I was wondered if any way to backup those domains. > particularly master one. > > > I was thinking somehow DRBD based replication, with > lvm snapshots etc. But it looks like overkill. > > Will be nice somehow to deploy replicated/HA Master > domain with ability to backp on tapes as well. > > > Any ideas are welcome. > > Thanks, > > Arman. > > > > _______________________________________________ > Users mailing list > [email protected] > http://lists.ovirt.org/mailman/listinfo/users > > > > > -- Med Vänliga Hälsningar ------------------------------------------------------------------------------- Karli Sjöberg Swedish University of Agricultural Sciences Box 7079 (Visiting Address Kronåsvägen 8) S-750 07 Uppsala, Sweden Phone: +46-(0)18-67 15 66 [email protected] _______________________________________________ Users mailing list [email protected] http://lists.ovirt.org/mailman/listinfo/users
