Re: [Xen-users] xen storage options - plase advise

[James Pifer <jep@xxxxxxxxxxxxxxxx>]

On Thu, 2010-03-04 at 10:18 -0500, John Madden wrote:
> > Nobody has answered the question of disk space usage. Let's say I have
> > five Windows 2008 servers. Right now they are using file based, growable
> > storage. 
> > 
> > They each have a disk0 that is growable and partitioned like:
> > c: = 25gb
> > e: = 175gb (using round numbers)
> > 
> > Using clvm, would I be using 1TB of storage for these five domUs?
> 
> Of course -- you aren't gaining anything magic by using one disk 
> technology over another unless you start talking about de-duplication. 
> If you want the benefits of the "auto-growing sparse files" that you're 
> currently using, consider allocating the amount of storage you actually 
> need and growing it (via lvm) as you go.
> 
> John
> 

Ok, so if I want to keep using "auto-growing sparse files" I would do
this.

1) Assign the same vdisk from the SAN to multiple servers. 
2) Create an LVM on this disk. 
3) Each server would run these commands to see the LVM and then mount
it:
pvscan 
vgscan 
vgchange -ay
4) If I need to expand the LVM disk due to growth, we would extend the
vdisk, then use LVM to grow the space. 

Essentially this is giving me a shared storage without any clustering.
This would allow me to live migrate domU's between servers. 

Is that correct? Am I missing anything?

Thanks,
James


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