8:12 a.m.
Hi!
Dan, it seems you know something about storage, so I adress you:
I find the oVirt storage framework a bit odd. It has it advantages, but also a lot of
disadvantiages, it seems.
I did earlier, in this thread, ask about storage setups you want to use in enterprise
environments. And I like to continue that discussion.
If you like to replicate on SAN level between, let's say two different LUN's, that
should contain the same informnation for a host, or for a VM, then you end up in trouble
if you use the oVirt storage system. Because you need to put the two LUN's from the
different datacenters together, to become ONE unit, otherwise you don't get the right
uuid for live migration. Isn't right?
As you wrote earlier, this might be solved with gluster, but is it so, that oVirt is going
to get enterprise features only in pair with gluster? I don't believe that is a good
idea for the adoption of oVirt.
oVirt must have a good support for enterprise features that is used today, like NPIV. I
have googled around oVirt and NPIV and didn't come up with much, you can tell me
something about it?
I belive it would be good if oVirt supported other storage system types than the one
system it supports today, that all storage should be imported and handled by LVM and oVirt
engine.
Most enterprise storage today is fibre channel and NPIV based. You boot most the VM's
through NPIV LUN's, you add more space through thin provisioning or more NPIV
LUN's.
And this is going to continue, even if the Fc world move to FCoE.
So perhaps you can tell me a little bit about the storage strategy that oVirt dev team
has?
Rgrds Johan
-----Dan Yasny <dyasny(a)redhat.com> skrev: -----
Till: Johan Kragsterman <johan.kragsterman(a)capvert.se>
Från: Dan Yasny <dyasny(a)redhat.com>
Datum: 2012.07.29 12:55
Kopia: users(a)ovirt.org
Ärende: Re: [Users] host raiding two LUN from different external storage
You can use replicated at the SAN level storage between different DCs, for DR. You can
also use Gluster for the same purpose.
Setting RAID1 between two geographically separate hosts is asking for trouble.
----- Original Message -----
From: "Johan Kragsterman"
<johan.kragsterman(a)capvert.se>
To: users(a)ovirt.org
Sent: Sunday, 29 July, 2012 12:08:20 PM
Subject: [Users] host raiding two LUN from different external storage
Hi!
In some setups, like when you got two datacenters that works like
failover sites, you would like to have two external raid
controllers(storage devices), one in each datacenter.
You then send two identical LUN's, from each controller, to a
cluster, let's say two hosts, for simplicity. What you normally do
is to host raid these LUN's in mirror(raid 1), so the hosts write
the same to both LUN's, and both controllers.
Question for me here is if I can accomplish this in oVirt management?
Because if I can't, it will be a problem, because if I host raid at
the host level, then the storage would be local storage for oVirt,
wouldn't it? And then I suppose it can't be used for live migration,
can it?
Regrds Johan
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Regards,
Dan Yasny
Red Hat Israel
+972 9769 2280