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

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

On Wednesday 19 May 2010 17:49:15 Javier Guerra Giraldez wrote:
> 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

Hi,

What would you define as "change anything"? Add a LV? I suppose a "lvscan" on 
every node would take care of the changes, no? Or does it mean I cannot  take 
a snapshot? Or resize? Or all?

thx!!

B.


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