Paul Howarth wrote:
On Thu, 2005-08-04 at 00:55 -0600, Philip Prindeville wrote:
If I just got an identical disk to /dev/sda (as /dev/sdb), and I want to
create an identical /dev/sdb2 partition (to /dev/sda1) in size,
Use fdisk to create a partition with the same number of cylinders as
sda1.
then
create a logical volume as LogVol01 that's identical in size and
properties to LogVol00 (which was created by the default install
procedures) and then add it to VolGroup00, what are the steps
to do this?
Create a physical volume on sdb2:
# pvcreate /dev/sdb2
Add sdb2 to Volume Group VolGroup00:
# vgextend VolGroup00 /dev/sdb2
Get details of LogVol00 (particularly size in extents (LE)):
# lvdisplay /dev/VolGroup00/LogVol00
Create LogVol01 with same size (n):
# lvcreate --extents n --name LogVol01 VolGroup00
That should do it. The default LogVol00 won't have any "special" options
and will fill the original partition sda1, so this procedure should
result in what you're after.
However, do you really want a separate logical volume rather than
extending LogVol00 to make it bigger?
Paul.
I was thinking that if the logical volumes are separate then there is
the possibility of parallelizing atomic operations (like journaling,
deletions, etc) that would result in better performance.
Likewise, doing a filesystem check after a crash can run in parallel
on both volumes...
-Philip
