[Gllug] LVM and /dev/sdc vs /dev/sdc1

[Daniel P. Berrange]

On Thu, Aug 28, 2008 at 02:40:10PM +0100, Alain Williams wrote:
> I recently put in a new (SATA) disk - to be partitioned under the Linux LVM.
> 
> Out of force of habit I partitioned the disk, put everything into /dev/sdc1
> and gave it to the LVM. Is there any virtue in doing this rather than
> giving LVM /dev/sdc -- and thus giving myself an extra block or so by not
> having the partition table ?

You can use the whole disk, but I prefer not too because it can surprise
people who aren't expecting it. They'll see a big unpartitioned disk and
think it is unused :-) At least if you have a single partition marked LVM
it is clear that it is allocated to some purpose.

Also, note you must ensure you blank out the first sector before using
pvcreate on a whole disk, otherwise LVM can get really confused about
things.

Daniel
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