<div dir="ltr">yes + 1xssd cache<br><br><br> NAME STATE READ WRITE CKSUM<br> tank ONLINE 0 0 0<br> raidz2-0 ONLINE 0 0 0<br> scsi-35000cca22be96bed ONLINE 0 0 0<br> scsi-35000cca22bc5a20e ONLINE 0 0 0<br> scsi-35000cca22bc515ee ONLINE 0 0 0<br> ata-Hitachi_HUS724030ALE640_PK2A31PAG9VJXW ONLINE 0 0 0<br> scsi-35000cca22bc1f9cf ONLINE 0 0 0<br> scsi-35000cca22be68899 ONLINE 0 0 0<br> scsi-35000cca22bc58e1b ONLINE 0 0 0<br> scsi-35000cca22bc4dc6b ONLINE 0 0 0<br> scsi-35000cca22bc394ee ONLINE 0 0 0<br> scsi-35000cca22bc10d97 ONLINE 0 0 0<br> scsi-35000cca22bc605d1 ONLINE 0 0 0<br> scsi-35000cca22bc412bf ONLINE 0 0 0<br> scsi-35000cca22bc3f9ad ONLINE 0 0 0<br> scsi-35000cca22bc53004 ONLINE 0 0 0<br> scsi-35000cca22bc5b8e2 ONLINE 0 0 0<br> scsi-35000cca22bc3beb3 ONLINE 0 0 0<br> cache<br> sdc ONLINE 0 0 0<br><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 23, 2014 at 10:57 AM, Karli Sjöberg <span dir="ltr"><<a href="mailto:Karli.Sjoberg@slu.se" target="_blank">Karli.Sjoberg@slu.se</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Thu, 2014-10-23 at 10:11 +0200, Arman Khalatyan wrote:<br>
><br>
> ---------- Forwarded message ----------<br>
> From: Arman Khalatyan <<a href="mailto:arm2arm@gmail.com">arm2arm@gmail.com</a>><br>
> Date: Thu, Oct 23, 2014 at 10:11 AM<br>
> Subject: Re: [ovirt-users] Are there some general strategyhow to Iscsi<br>
> strorage domain?<br>
> To: Trey Dockendorf <<a href="mailto:treydock@gmail.com">treydock@gmail.com</a>><br>
><br>
><br>
> Thank you Trey for sharing your setup.<br>
><br>
> I have also one test system with zvol exported with iscsi over 10G.<br>
> Unfortunately the difference in performance of zfs over raid<br>
> controller is huge, particularly where VM running mysql. I did not try<br>
> HBAs yet, I have only LSI/Adaptec/Areca RaidControllers they dont have<br>
> IT mode. Maybe that can be the reason.<br>
><br>
> For sure always one need to find the sweet edge between performance<br>
> and reliability.<br>
><br>
> Just for comparison with yours I get on random IO:<br>
> zvol/16Disks/Raid2/tgtd/iscsi/10G-> on VM multiple rsync -<br>
> ~100-150MB/s, Same HW but disks with Areca RAID6 - 650MB/s stable<br>
> even more in some cases.<br>
<br>
</span>Did you have separate log devices attached to the pool?<br>
<br>
The pool´s name was '16Disks'. Did you have 16 disks in one radiz2 vdev?<br>
<br>
/K<br>
<div class="HOEnZb"><div class="h5"><br>
><br>
> The best performance I got on FDR iser-><br>
> 80% of bare metal performance: 1500MB/s but ovirt goes mad claiming<br>
> that Network and Disk devices are saturated. My VM goes time by time<br>
> to paused state.<br>
> It is due to that the Ovirt treating all ib devices as 10Gbit<br>
> cards(in terms of speed).:(<br>
><br>
><br>
><br>
><br>
><br>
><br>
> On Thu, Oct 23, 2014 at 8:30 AM, Trey Dockendorf <<a href="mailto:treydock@gmail.com">treydock@gmail.com</a>><br>
> wrote:<br>
> Not sure if it's a solution for you, but ZFS. My domains are<br>
> all ZFS (using ZFS on Linux in EL6.5) and my backup server<br>
> receives incremental snapshots from primary storage which<br>
> includes both NFS exports and iSCSI. ZFS makes creating block<br>
> devices for iSCSI very easy, and they are included in snapshot<br>
> replication. The replication is not HA but disaster recovery<br>
> and off site.<br>
><br>
> I've hit 300MB/s using ZFS send over IPoIB on my DDR fabric,<br>
> which isn't amazing but not terrible for an old DDR fabric.<br>
><br>
> ZFS is probably not an easy solution as requires rebuilding<br>
> your storage, but maybe for future use or other readers it<br>
> will give some useful ideas.<br>
><br>
> - Trey<br>
><br>
> On Oct 22, 2014 11:56 AM, "Arman Khalatyan"<br>
> <<a href="mailto:arm2arm@gmail.com">arm2arm@gmail.com</a>> wrote:<br>
><br>
> Hi,<br>
> I have 2x40TB domains each are exported with<br>
> iser/iscsi with ib and 10Gb interfaces.<br>
><br>
> For sure they are RAID6 storage little bit save on<br>
> failure.<br>
> But I was wondered if any way to backup those domains.<br>
> particularly master one.<br>
><br>
><br>
> I was thinking somehow DRBD based replication, with<br>
> lvm snapshots etc. But it looks like overkill.<br>
><br>
> Will be nice somehow to deploy replicated/HA Master<br>
> domain with ability to backp on tapes as well.<br>
><br>
><br>
> Any ideas are welcome.<br>
><br>
> Thanks,<br>
><br>
> Arman.<br>
><br>
><br>
><br>
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><br>
><br>
><br>
><br>
><br>
<br>
<br>
<br>
</div></div><span class="HOEnZb"><font color="#888888">--<br>
<br>
Med Vänliga Hälsningar<br>
<br>
-------------------------------------------------------------------------------<br>
Karli Sjöberg<br>
Swedish University of Agricultural Sciences Box 7079 (Visiting Address<br>
Kronåsvägen 8)<br>
S-750 07 Uppsala, Sweden<br>
Phone: <a href="tel:%2B46-%280%2918-67%2015%2066" value="+4618671566">+46-(0)18-67 15 66</a><br>
<a href="mailto:karli.sjoberg@slu.se">karli.sjoberg@slu.se</a><br>
</font></span></blockquote></div><br></div>