Re: [Xen-users] High availability and live migration with just LVMand hardware fencing

[Javier Guerra Giraldez <javier@xxxxxxxxxxx>]

On Wed, May 19, 2010 at 9:08 AM, Bart Coninckx <bart.coninckx@xxxxxxxxxx> wrote:
> By the way: would it be correct to state that cLVM is only an advantage when
> dealing with more than one volume group (being the result of having more than
> one LUN)?

no.

- as soon as more than one host can R/W a volume group, you need to
coordinate volume management changes somehow.  if you change anything
on one host without (lock-safely) propagating it to the others, you'll
almost surely corrupt the LVM metadata.  if you rarely change it, you
can get by without cLVM, but then you have to take all hosts offline
while you commit changes.

- you can have many LUNs on a single volume group, just add each as a PV

-- 
Javier

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