03-02-2014
Hi,
pvmove is easy to use. However, This approach can be fatal if something goes wrong.ex: You lose connectivity or did a wrong pvmove. Then, you will have to back to your backup to restore.
LV mirroring is safe option and recommended.
I remember one situation when i was supposed to choose between these two in a suddenly called data migration on one DB server. and per discussion - pvmove was choose and it only need one same size of disk and all went good untill by mistake i thought i moved data from blank disk to full disk. I was like darn.....then after 10-15 mins i realized i was looking at wrong window of mine....
Go for no hassle : lv mirroring.
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LEARN ABOUT NETBSD
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] [--setphysicalvolumesizesize] 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 2.02.44-cvs (02-17-09) PVRESIZE(8)