04-30-2010
Partition management: lvm? fdisk? parted? (on RAID)
Hello,
I have a RHEL system with two 500GB hard drives in RAID 1 (I think hardware, but not 100% certain - any way to tell?).
It looks like it was just set up in default configuration with a small boot partition and one huge partition for the rest, which composes a LVM volume.
I want to break that partition up into at least two separate ones. What I am wondering is:
* What's the difference between using fdisk and parted? Any reason to use one over the other?
* Should I just use lvm instead to shrink the current volume and create a second one? Is there a down-side to use logical volumes without creating a physical partition with fdisk/parted?
* Being that there are already two disks in RAID 1 configuration, does partitioning with lvm or fdisk/parted transparently propagate to the mirror disk or do I need to do something to partition BOTH drives?
Thanks in advance!!
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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)