10-01-2015
Other then stuff mentioned here i would like to make a general recommendation regarding disk devices in Linux.
If you present a disk for instance /dev/xxx, create a primary partition /dev/sda1 which you will use in your volume groups / filesystems / ASM and label it like that (LVM label or other) during fdisk operation.
Why partition ?
Initial sectors are for OS information.
Easier to see and correct possible errors which are out of LVM/ASM/filesystem scope.
Disks partitioned are quite obviously used for some service (LVM, ASM etc.), while non-partitioned are not, reducing possible risk of error during administrative work.
Using full devices will work as well on Linux systems, but due to reasons above i would suggest making one primary partition if you intend to use entire disk space.
As for multipath, use /dev/mapper when creating volume groups and such.
Also using sane names for storage luns in /etc/multipath.conf helps e.g /dev/mapper/databaselun looks much more human then /dev/mapper/mpathXY
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LEARN ABOUT DEBIAN
pvresize
PVRESIZE(8) System Manager's Manual PVRESIZE(8)
NAME
pvresize - resize a disk or partition in use by LVM2
SYNOPSIS
pvresize [-d|--debug] [-h|--help] [-t|--test] [-v|--verbose] [--version] [--setphysicalvolumesize size] PhysicalVolume [PhysicalVolume...]
DESCRIPTION
pvresize resizes PhysicalVolume which may already be in a volume group and have active logical volumes allocated on it.
OPTIONS
See lvm(8) for common options.
--setphysicalvolumesize size
Overrides the automatically-detected size of the PV. Use with care, or prior to reducing the physical size of the device.
EXAMPLES
Expand the PV on /dev/sda1 after enlarging the partition with fdisk:
pvresize /dev/sda1
Shrink the PV on /dev/sda1 prior to shrinking the partition with fdisk (ensure that the PV size is appropriate for your intended new parti-
tion size):
pvresize --setphysicalvolumesize 40G /dev/sda1
RESTRICTIONS
pvresize will refuse to shrink PhysicalVolume if it has allocated extents after where its new end would be. In the future, it should relo-
cate these elsewhere in the volume group if there is sufficient free space, like pvmove does.
pvresize won't currently work correctly on LVM1 volumes or PVs with extra metadata areas.
SEE ALSO
lvm(8), pvmove(8), lvresize(8), fdisk(8)
Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) PVRESIZE(8)