12:13 p.m.
Backup of a whole storage domain is problematic with regards to the data consistency.
I would assume the important entities are specific VM disks and templates and you should
try to backup the most important ones more frequently than others.
It would be more correct to take a live snapshot of a disk and then use dd or DRBD as you
suggested, as frequently as you need. This also ensure the data consistency much better
than a whole storage domain.
To better answer your question,
What is the general use of your domains? What is the general number of disks you have
there?
What percentage are the most important ones? Do you really want all of them backed-up? How
often do you need the backup to take place?
Regards,
Vered
----- Original Message -----
From: "Arman Khalatyan" <arm2arm(a)gmail.com>
To: "users" <users(a)ovirt.org>
Sent: Thursday, October 23, 2014 11:11:43 AM
Subject: [ovirt-users] Fwd: Are there some general strategyhow to Iscsi strorage domain?
---------- Forwarded message ----------
From: Arman Khalatyan < arm2arm(a)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(a)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.
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(a)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(a)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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