[Ocfs2-users] Multiple LUNs and ocfs2

[Mihail Daskalov]

Hi,
I would recommend you to check Oracle VM 2.2 as it have the capabilities to
use directly multipath block devices, 
and assign them to guest VMs. This way you could bypass ocfs2.
Anyway if you MUST provide 6*100 G to you guest VM, you must either have
6*100 virtual disks as OCFS2 files, or have 6*100 logical volumes in the
host environment (which is not recommended because the LVM is not cluster
aware yet in OVM), or 6*100G partitions from a single SAN LUN, or 6*100G
different SAN luns.
After you provide 6*100G block devices to you guest VM, I would use ASM if I
want a database on them...

HTH,
 
Mihail Daskalov, Technology Manager
Software Development, TechnoLogica

 

-----Original Message-----
From: ocfs2-users-bounces at oss.oracle.com
[mailto:ocfs2-users-bounces at oss.oracle.com] On Behalf Of Bill Ranck
Sent: Tuesday, October 20, 2009 10:33 PM
To: ocfs2-users at oss.oracle.com
Subject: [Ocfs2-users] Multiple LUNs and ocfs2

Hello folks,
   I am a newbie with ocfs2 and Oracle VM in general, but I'm slowly
figuring things out.  I have installed ovm server on 2 blades in an IBM
bladecenter, and I have gotten ocfs2 working such that both blades are
mounting /OVS from a shared SAN LUN.  So far, so good.
   I will be installing a guest VM on one of the blades with the idea
that we can do live migration if/when needed.  The database that will be
set up there will need to use 6 X 100G LUNs from the SAN.  What is the
best way to aggregate these LUNs for that purpose?  I've got them
visible as /dev/dm-2 through /dev/dm-7 on both systems.  Do I use LVM at
the hypervisor level to combine them into one big disk group and volume,
then use mkfs.ocfs2 on that?  Or is there a better way?
   I see, with a quick look through of the archives from this list, that
ocfs2 can not aggregate the LUNs itself.  I'm just hoping for a pointer
in the right direction so I don't shoot myself in the foot by choosing
the wrong thing early in the project.

-- 
Bill Ranck
Blacksburg, Va.
540-231-3951


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