[ovirt-users] Fwd: Are there some general strategyhow to Iscsi strorage domain?

[Arman Khalatyan]

yes + 1xssd cache


        NAME                                            STATE     READ
WRITE CKSUM
        tank                                            ONLINE       0
0     0
          raidz2-0                                      ONLINE       0
0     0
            scsi-35000cca22be96bed                      ONLINE       0
0     0
            scsi-35000cca22bc5a20e                      ONLINE       0
0     0
            scsi-35000cca22bc515ee                      ONLINE       0
0     0
            ata-Hitachi_HUS724030ALE640_PK2A31PAG9VJXW  ONLINE       0
0     0
            scsi-35000cca22bc1f9cf                      ONLINE       0
0     0
            scsi-35000cca22be68899                      ONLINE       0
0     0
            scsi-35000cca22bc58e1b                      ONLINE       0
0     0
            scsi-35000cca22bc4dc6b                      ONLINE       0
0     0
            scsi-35000cca22bc394ee                      ONLINE       0
0     0
            scsi-35000cca22bc10d97                      ONLINE       0
0     0
            scsi-35000cca22bc605d1                      ONLINE       0
0     0
            scsi-35000cca22bc412bf                      ONLINE       0
0     0
            scsi-35000cca22bc3f9ad                      ONLINE       0
0     0
            scsi-35000cca22bc53004                      ONLINE       0
0     0
            scsi-35000cca22bc5b8e2                      ONLINE       0
0     0
            scsi-35000cca22bc3beb3                      ONLINE       0
0     0
        cache
          sdc                                           ONLINE       0
0     0


On Thu, Oct 23, 2014 at 10:57 AM, Karli Sjöberg <Karli.Sjoberg at slu.se>
wrote:

> On Thu, 2014-10-23 at 10:11 +0200, Arman Khalatyan wrote:
> >
> > ---------- Forwarded message ----------
> > From: Arman Khalatyan <arm2arm at gmail.com>
> > 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 <treydock at gmail.com>
> >
> >
> > 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 <treydock at gmail.com>
> > 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"
> >         <arm2arm at gmail.com> 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.
> >
> >
> >
> >                 _______________________________________________
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> >                 Users at ovirt.org
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> >
> >
> >
> >
> >
>
>
>
> --
>
> 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
> karli.sjoberg at slu.se
>
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