On 09/06/2012 09:47 AM, Sanglikar, Amol (Serviceguard) wrote:
Hi All,
Thanks for all your responses.
1/ we are using FC setup and not iSCSI. SO using SCSI is not an option for us
right now.
2/ Yes you are correct NPIV will give us VHBA , but is it supported on guests
as of now , both in case of RHEL6.2+ KVM and RHEV 3.0 ?
If they have VHBA support then pass through helps me reach the LUNs and have
SCSI PR working.
3/ Also does RHEV 3.0 support direct LUN access ?
What I got to read from redhat docs is as follows.
latest "BETA" release of RHEV 3.1 seems to be only having direct LUN access.
http://www.redhat.com/about/news/archive/2012/8/red-hat-delivers-first-beta-for-red-hate-enterprise-virtualization-3-1
ovirt (and rhev) 3.0 have direct lun as a custom hook.
ovirt (and rhev) 3.1 have direct lun as a full blown feature
New virtual machine storage features including hotplug support and direct LUN
access
SO I guess only option I have os to wait for RHEV 3.1 ?
or use the directlun custom hook with 3.0 as a temporary solution:
http://gerrit.ovirt.org/gitweb?p=vdsm.git;a=tree;f=vdsm_hooks;
Again Thanks a lot for answering my queries.
Thanks & Regards,
-Amol
-----Original Message-----
From: Johan Kragsterman [mailto:johan.kragster...@capvert.se]
Sent: Thursday, August 30, 2012 12:46 PM
To: Itamar Heim
Cc: Sanglikar, Amol (Serviceguard); David Jaša; users@ovirt.org
Subject: Re: [Users] [node-devel] Help required to configure shared storage on
RHEL+KVM
Hi!
I don't think this is an oVirt discussion, but I can respond anyway, since the
storage part of oVirt, imho, is a bit after in development, or has a strategy I
don't really understand, perhaps. Maybe oVirt storage development strategy is
hard tied to gluster?
You don't tell us about the storage backend you got? If you got FC you can
create an NPIV on the RHEL 6.2 host. I don't think(unsupported so far...) you
can create NPIV on oVirt node or RHEL-V node, but I'm not sure about the
latter...
NPIV will give you the raw LUN directly to a VHBA, but I am not sure the
oVirt/KVM VM can use it the VHBA...?
Or as Itamar writes, you can always use iScsi....
Rgrds Johan
-----users-boun...@ovirt.org wrote: -----
To: users@ovirt.org, "Sanglikar, Amol \(Serviceguard\)" <am...@hp.com>
From: Itamar Heim
Sent by: users-boun...@ovirt.org
Date: 2012.08.29 13:53
Cc: David Jaša <dj...@redhat.com>
Subject: Re: [Users] [node-devel] Help required to configure shared storage on
RHEL+KVM
On 08/29/2012 12:34 PM, David Jaša wrote:
(moving to users@, node-devel is definitely a wrong list but I'm not
sure about a correct one)
hi Amol,
Sanglikar, Amol (Serviceguard) píše v Pá 24. 08. 2012 v 10:20 +0000:
Hi Ovirt dev-Community,
We have a host running RHEL 6.2 + KVM , and created 2 Virtual machines
on the host which are running RHEL6.2.
We are trying to configure shared storage for 2 VMs. This shared
storage on VMs should understand the SCSI requests.
IIRC, if you need to pass through SCSI requests from the VM to the
underlying block device, you need virtio-scsi qemu device that is
included in RHEL as a tech-preview since 6.3 - again IIRC.
not sure this is about ovirt at all?
why not iscsi from guests to storage directly?
The reason for this requirement is that we would be using SCSI-3 PR
(persistent reservation ) utils, which is sg3_utils to register /
reserve on the storage/disks.
We believe that exposing the raw LUNs from host to VMs as shared
storage (which is same as RDM - Raw Device Mapping in VMware ESX
environment ) would meet our above stated requirement.
So can you please help us understand the following
1/ How to expose the Raw LUNs , from host ( RHEL 6.2 + KVM ) to
Virtual machines which are running RHEK 6.2.
You should create a shared disk but you can't get it really raw in terms
of scsi commands unless you switch to virtio-scsi. It is raw in a sense
of not using intermediate layers like qcow2 on top of the LUN.
David
2/ Also , if there is any alternate way to achieve the above
requirement in RHEL + KVM environment, apart from the mechanism we
stated , please let us know.
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