Re: AW: [Xen-users] Shared volume: Software-ISCSI or GFS or OCFS2?

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

I'm not sure where or how you want to use software iSCSI - maybe you could 
provide a more thorough description of your Xen environment?

As far as OCFS vs GFS, you can use whichever you like.  I use OCFS2 for two 
reasons: first because it's included with SLES 10, and second because I find it 
slightly easier to configure than GFS.  It has its downsides, too, though, but 
works fine for me.  Use whichever cluster-aware FS you want.

-Nick
Nick Couchman
Manager, Information Technology 
-----Original Message-----
From: "Rustedt, Florian" <Florian.Rustedt@xxxxxxxxxxx>
To: Nick Couchman <Nick.Couchman@xxxxxxxxx>

Sent: 11/17/2008 2:09:13 AM
Subject: AW: [Xen-users] Shared volume: Software-ISCSI or GFS or OCFS2?

Ok?
So what's the real advantage of using "software-iscsi" then for me?
And what about GFS instead of OCFS2?
 
Kind regards, Florian

________________________________

Von: Nick Couchman [mailto:Nick.Couchman@xxxxxxxxx] 
Gesendet: Freitag, 14. November 2008 17:23
An: Rustedt, Florian
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Betreff: Re: [Xen-users] Shared volume: Software-ISCSI or GFS or OCFS2?


Well, I'm not sure it's a matter of iSCSI OR a filesystem, but that
depends on how you decide to go about setting it up.  In my environment,
I have both iSCSI and FC access to the same volumes.  Some of my servers
have FC HBAs and connect to my XEN volume that way, some of them have
hardware iSCSI HBAs, and some of them use software iSCSI initiators.  I
have three XEN volumes - one for server domUs, one for VDI domUs, and
one for development domUs.  All of these volumes are formatted with
OCFS2 so that I can mount them on all of my servers.  The domUs then use
file-based disks that reside on the shared volumes, so I can migrate
them back and forth between servers relatively easily.

You could use iSCSI to do individual volumes for each of your domUs - I
found it a bit cumbersome to have to go into either EVMS or LVM each
time I wanted to create a domU and create a volume for it, so I'm
sticking with the file-based approach.

-Nick


-----Original Message-----
From: Rustedt, Florian <Florian.Rustedt@xxxxxxxxxxx
<mailto:%22Rustedt,%20Florian%22%20%3cFlorian.Rustedt@xxxxxxxxxxx%3e> >
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Shared volume: Software-ISCSI or GFS or OCFS2?
Date: Fri, 14 Nov 2008 11:09:33 +0100


Hello list,

I want to use shared volumes between severall vm's and defenetly don't
want to use NFS or Samba!

So i have three options:
1. simulated(software-) iscsi
2. GFS
3. OCFS2

What do you suggest and why?

Kind regards, Florian
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