[CentOS] Disc layout advice

Stephen Harris lists at spuddy.org
Tue Oct 6 20:58:19 UTC 2009


On Tue, Oct 06, 2009 at 07:29:00PM +0000, Joseph L. Casale wrote:
> >You don't run pvcreate on lvm partitions.  You run pvcreate on the block
> >devices that will be added to the volume groups.
> 
> You sure can run pvcreate on a partition, for example /dev/cciss/c0d0p1

c0d0p1 is not an LVM partition.  It's a disk partition.  Be careful of
terminology.

The *next paragraph* of the email you replied to said
  "Now these block devices could be a hard disk partition" 

If you look at /dev/cciss/c0d0p1 then you'll see it's a block device.
("ls -l" and you'll see the first character is a "b").  A partition is
a specific type of block device.

However, the point of my email is the level that you think of it.
If you think in terms of devices then you don't get any confusion
(so no questions such as "do I need to partition my md disk for lvm?")
because you're thinking in terms of how the technology works.  Your "md"
raid device, your disk partition, your whole disk... they're all just
block devices.

-- 

rgds
Stephen


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