Xen users - May 2010 - Advice on storage configuration

I am about to reconfigure my disks and storage. Right now I have disk
images on each host''s disk, but that is not very good. I also have a
SAN storage connected by fiber on each host, that I am not really
using yet with xen. This is what I want to support in the future:

- unified storage of all images, probably in LVM or similar form
because of performance and live migration
- live migration between hosts
- better usage of host''s disks and SAN storage

I am thinking about using CLVM to join all my 8 hosts disks in a
cluster, but that would leave my SAN out, but if I use my SAN area,
how to make various hosts access the same area without locking issues,
etc?

Any advice is welcome.

-- 
José de Paula Eufrásio Júnior (coredump)
MCSO, GRC Professional
http://core.eti.br

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> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com [mailto:xen-users-
> bounces@lists.xensource.com] On Behalf Of Jose de Paula Eufrasio Junior
> Sent: Saturday, May 22, 2010 10:32 AM
> To: xen-users@lists.xensource.com
> Subject: [Xen-users] Advice on storage configuration
> 
> I am thinking about using CLVM to join all my 8 hosts disks in a
> cluster, but that would leave my SAN out,
Why do you say that?  CLVM needs a network block device to operate.  A SAN is a
good choice.
> but if I use my SAN area,
> how to make various hosts access the same area without locking issues,
> etc?
That's exactly what CLVM solves.

-Jeff


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On Sun, May 23, 2010 at 11:32, Jeff Sturm <jeff.sturm@eprize.com>
wrote:
>> I am thinking about using CLVM to join all my 8 hosts disks in a
>> cluster, but that would leave my SAN out,
>
> Why do you say that?  CLVM needs a network block device to operate.  A SAN
is a good choice.
But if I use only the SAN, I will kinda lose the disk space I have
avaiable on my xen hosts, right? Or can I join together them all?




-- 
José de Paula Eufrásio Júnior (coredump)
MCSO, GRC Professional
http://core.eti.br

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On Mon, May 24, 2010 at 11:42:54AM -0300, Jose de Paula Eufrasio Junior
wrote:
> On Sun, May 23, 2010 at 11:32, Jeff Sturm <jeff.sturm@eprize.com>
wrote:
> >> I am thinking about using CLVM to join all my 8 hosts disks in a
> >> cluster, but that would leave my SAN out,
> >
> > Why do you say that?  CLVM needs a network block device to operate.  A
SAN is a good choice.
> 
> But if I use only the SAN, I will kinda lose the disk space I have
> avaiable on my xen hosts, right? Or can I join together them all?
For using local storage only, have you looked at using DRBD to provide
redundancy and live migration?

regards,
iustin

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Is DRBD 1:1 or can I have like 7 machines configured with it to
provide migration?

Also, can someone point me to a good clvm documentation on debian?

-- 
José de Paula Eufrásio Júnior (coredump)
http://core.eti.br

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On Thursday 27 May 2010 03:58:42 Jose de Paula Eufrasio Junior
wrote:
> Is DRBD 1:1 or can I have like 7 machines configured with it to
> provide migration?
> 
> Also, can someone point me to a good clvm documentation on debian?
> 
1:1, but if you separate your storage from your Dom0, you could have 7 
machines and still migrate.

Bart

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