Never heard of HIT before.
Seems to be a proprietary Dell solution?
Ok, I just high-lighted the classical /most common SAN connection :)

We are using a Dell MD3220i (much smaller then EQ series) with MD1200 units, 
and yes the network configuration for subnet separated multipathing seems to be 
more complicated at first,
but it will give you load-balancing and auto fail-over functionality.

Of course a nice and quick alternative as suggested here "...but you can 
configure your nodes to use the other paths using the command line on the 
Centos nodes...",
is also possible.

Cheers,
Sven.

Von: Chris Noffsinger [mailto:cnoff...@gmail.com]
Gesendet: Donnerstag, 21. Februar 2013 20:05
An: Jonathan Horne
Cc: Sven Knohsalla; Baptiste AGASSE; users@ovirt.org
Betreff: Re: [Users] iSCSI multipath with EqualLogic SAN

We have 2 Equallogic PS4100s.  And someone more knowledgeable may prove me 
wrong here but,

Multipathd is not my most favorite thing to configure, but you can configure 
your nodes to use the other paths using the command line on the Centos nodes.

Yeah Dell will tell you that they want you to use their software (like the mem 
plugin in Vmware) but the Linux OS will see the other paths and treat it like 
any other SAN, you are just going to have to configure them to use them.   The 
link sent earlier in the thread is the official guide to doing that.

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/pdf/DM_Multipath/Red_Hat_Enterprise_Linux-6-DM_Multipath-en-US.pdf


Here is another Doc I used that is for Rhel5 but I beleive the multipath 
commands are the same:

http://www.equallogic.com/WorkArea/downloadasset.aspx?id=8727


On Thu, Feb 21, 2013 at 1:09 PM, Jonathan Horne 
<jho...@skopos.us<mailto:jho...@skopos.us>> wrote:
Ive discussed this at length with dell's EQ support team, and on a regular 
system that's connected in to an equallogic san, all the iscsi ports would be 
on the same subnet.  The kicker is, dell really wants you to use their 
specialized driver/iscsiinitiator to access (known as their HIT kit...host 
integration tools), and the HIT kit handles establishing all the multiple 
sessions into the EQ SAN.

Unfortunately, equallogic  doesnt support RHEV (and thus ovirt), and ovirt does 
not seem to execute the commands the HIT driver would want to intitiate 
multiple connections.

Dell says that the use of bonding for iscsi just begs for tcp retransmits.  
since bonding is the only method of failover I see for now, were using anyway 
against their recommendations (so far zero retransmits, but were not running 
our systems hard yet).

Cheers,
Jonathan

-----Original Message-----
From: users-boun...@ovirt.org<mailto:users-boun...@ovirt.org> 
[mailto:users-boun...@ovirt.org<mailto:users-boun...@ovirt.org>] On Behalf Of 
Sven Knohsalla
Sent: Thursday, February 21, 2013 8:55 AM
To: Baptiste AGASSE
Cc: users@ovirt.org<mailto:users@ovirt.org>
Subject: Re: [Users] iSCSI multipath with EqualLogic SAN

Hi Baptiste,

usually a SAN doesn't support bonding (see post of Nicolas) of its interfaces, 
so you have to use multipathing technology.

You have to separate all nics in different subnets so multipath can work.
Command multipath -ll with show the connected paths.

If you "merge" all paths in one subnet you will have the result/behavior you 
just posted.

So this is less oVirt related, more network specific.
We have a running iSCSI config with 4 networks and oVirt runs well.

Maybe the following link will help you here:
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/pdf/DM_Multipath/Red_Hat_Enterprise_Linux-6-DM_Multipath-en-US.pdf

Cheers,
Sven.

-----Ursprüngliche Nachricht-----
Von: users-boun...@ovirt.org<mailto:users-boun...@ovirt.org> 
[mailto:users-boun...@ovirt.org<mailto:users-boun...@ovirt.org>] Im Auftrag von 
Nicolas Ecarnot
Gesendet: Donnerstag, 21. Februar 2013 15:48
An: users@ovirt.org<mailto:users@ovirt.org>
Betreff: Re: [Users] iSCSI multipath with EqualLogic SAN

Le 21/02/2013 11:30, Baptiste AGASSE a écrit :
> Hi all,
>
> I'm testing ovirt 3.1 on centos boxes. I setup ovirt management node
> and 4 vdsm hosts. vdsm hosts have 2 nics on the SAN subnet. When i
> create a iscsi storage domain, it use only one of the two nics on the
> SAN network (showed with iscsiadm -m session on vdsm nodes). Does
> ovirt support multiples nics on the same subnet for iscsi SAN
> connection ?

I don't know if this is the best setup, but this is exaclty what I did (iSCSI 
with an Equllogic SAN) : I bonded 4 interfaces of the iSCSI subnet, and it's 
working fine so far...

--
Nicolas Ecarnot
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