Xen users - Feb 2009 - 1/2 OFF-TOPIC: How to use CLVM (on top AoE vblades) instead just plain LVM for Xen based VMs on Debian 5.0?

Guys,

 I have setup my hard disc with 3 partitions:

1- 256MB on /boot;
2- 2GB on / for my dom0 (Debian 5.0) (eth0 default bridge for guests LAN);
3- 498GB exported with vblade-persist to my network (eth1 for the AoE
protocol).

 On dom0 hypervisor01:
vblade-persist setup 0 0 eth1 /dev/sda3
vblade-persist start all

 How to create a CVLM VG with /dev/etherd/e0.0 on each of my dom0s?
Including the hypervisor01!

 I do not want to use GFS2/OCFS2 on top of CLVM, since I just want to
provide live-motion. I''ll never try to setup two
simultaneous domUs accessing the same CVLMs logical volumes.

 If someone can help me I will appreciate!

 This looks like the best way to create a low cost shared storage, I''m
right? I do not want NFS for my domUs...

Thanks,
Thiago


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I''ll need the GNBD in somewhere?

Sorry for the off-topic, but I doing some research to find out a better low
cost storage to Xen clusters. I''m learning about moving my dom0s to
OpenSolaris, to install ZFS and see its pool storage capabilities... ZFS can
be what I need to the storage, but OpenSolaris is good to be a dom0? Like
Linux 2.6.18 is?

I have 20 dom0, each with 2 500GB discs, totalizing 20T of storage space in
my network. So, I want to make a "big-redundant-array" with this 40
discs.
So, if one, maybe two or even five dom0s are out, all my data and my VMs
will be available. Only the cluster administrator will receive a note about
the dom0 failures.

For now, if I see the CLVM on top of AoE in my Debian 5.0, some things will
be clarified in my mind...   =)

-
Thiago

2009/2/25 Thiago Camargo Martins Cordeiro <thiagocmartinsc@gmail.com>
> Guys,
>
>  I have setup my hard disc with 3 partitions:
>
> 1- 256MB on /boot;
> 2- 2GB on / for my dom0 (Debian 5.0) (eth0 default bridge for guests LAN);
> 3- 498GB exported with vblade-persist to my network (eth1 for the AoE
> protocol).
>
>  On dom0 hypervisor01:
> vblade-persist setup 0 0 eth1 /dev/sda3
> vblade-persist start all
>
>  How to create a CVLM VG with /dev/etherd/e0.0 on each of my dom0s?
> Including the hypervisor01!
>
>  I do not want to use GFS2/OCFS2 on top of CLVM, since I just want to
> provide live-motion. I''ll never try to setup two
> simultaneous domUs accessing the same CVLMs logical volumes.
>
>  If someone can help me I will appreciate!
>
>  This looks like the best way to create a low cost shared storage,
I''m
> right? I do not want NFS for my domUs...
>
> Thanks,
> Thiago
>

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Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

On Wed, Feb 25, 2009 at 2:08 PM, Thiago Camargo Martins Cordeiro
<thiagocmartinsc@gmail.com> wrote:
> I''ll need the GNBD in somewhere?
I highly suggest you don''t. Seriously.
industry-standard iscsi will be a better option compared to gnbd.
>
> Sorry for the off-topic, but I doing some research to find out a better low
> cost storage to Xen clusters. I''m learning about moving my dom0s
to
> OpenSolaris, to install ZFS and see its pool storage capabilities... ZFS
can
> be what I need to the storage, but OpenSolaris is good to be a dom0? Like
> Linux 2.6.18 is?
>
Well, one things for sure, it''s MUCH harder to replace hypervisor on
opensolaris. So you''re basically stuck with whatever''s present
in
Opensolaris (as of now it''s Xen 3.1.4). Plus there are other
differences compared to Linux dom0.

http://opensolaris.org/jive/thread.jspa?threadID=90786

So in summary, if you''re used to Linux dom0, I''d highly
suggest you
keep it that way and use Opensolaris only for storage server exporting
iscsi to Linux dom0s.
> I have 20 dom0, each with 2 500GB discs, totalizing 20T of storage space in
> my network. So, I want to make a "big-redundant-array" with this
40 discs.
> So, if one, maybe two or even five dom0s are out, all my data and my VMs
> will be available. Only the cluster administrator will receive a note about
> the dom0 failures.
>
> For now, if I see the CLVM on top of AoE in my Debian 5.0, some things will
> be clarified in my mind...   =)

CLVM usually requires that you already have a centralized, shared
storage (SAN or NAS). If the storage is distributed on each server,
you might want to take a look at DRBD instead.

You might be able to run CLVM on top of DRBD, but IMHO for your
purpose that would only complicate things.

Regards,

Fajar

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