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 REDHAT
parted
PARTED(8) GNU Parted Manual PARTED(8)
NAME
GNU Parted - a partition manipulation program
SYNOPSIS
parted [options] [device [command [options...]...]]
DESCRIPTION
This manual page documents briefly the parted command. Complete documentation is distributed with the package in GNU Info format; see
below.
parted is a disk partitioning and partition resizing program. It allows you to create, destroy, resize, move and copy ext2, ext3, linux-
swap, FAT and FAT32 partitions. This is useful for creating space for new operating systems, reorganising disk usage, and copying data to
new hard disks.
OPTIONS
-h, --help
displays a help message.
-i, --interactive
where necessary, prompts for user intervention.
-s, --script
never prompts for user intervention.
-v, --version
displays the version.
COMMANDS
[device]
The block device to partition.
[command [options]]
Specifies a command to parted. If no command is given, parted will give you a command prompt. Commands are:
check partition
does a simple check on partition.
cp [source-device] source dest
copies the source partition's filesystem on source-device (or the current device if no other device was specified) to the
dest partition on the current device.
help [command]
prints general help, or help on command if specified.
mkfs partition fs-type
make a filesystem fs-type on partition. fs-type can be one of "FAT", "ext2" or "linux-swap".
mklabel label-type
Creates a new disklabel (partition table) of label-type. label-type should be one of "bsd", "gpt", "loop", "mac", "mips",
"msdos", "pc98" or "sun".
mkpart part-type [fs-type] start end
make a part-type partition with filesystem fs-type (if specified), beginning at start and ending at end (in megabytes).
part-type should be one of "primary", "logical" or "extended"
mkpartfs part-type fs-type start end
make a part-type partition with filesystem fs-type beginning at start and ending at end (in megabytes)
move partition start end
move partition to start at start and end at end. Note: move never changes the minor number
name partition name
set the name of partition to name. This option works only on Mac and PC98 disklabels. The name can be placed in quotes, if
necessary
print displays the partition table
quit exits parted
resize partition start end
resize the filesystem on partition to start at start and end at end megabytes
rm partition
deletes partition
select device
choose device as the current device to edit. device should usually be a Linux hard disk device, but it can be a partition,
software raid device or a LVM logical volume if that is necessary
set partition flag state
change the state of the flag on partition to state. Flags supported are: "boot", "root", "swap", "hidden", "raid", "lvm" and
"lba". state should be either "on" or "off"
REPORTING BUGS
Report bugs to <bug-parted@gnu.org>
SEE ALSO
fdisk(8), mkfs(8), The parted program is documented fully in the GNU partitioning software manual available via the Info system.
AUTHOR
This manual page was written by Timshel Knoll <timshel@debian.org>, for the Debian GNU/Linux system (but may be used by others).
parted 18 Mar, 2002 PARTED(8)