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Operating Systems Linux Creating MD-raid devices - post install Post 302159118 by Sprellarinn on Thursday 17th of January 2008 05:02:45 AM
Old 01-17-2008
Creating MD-raid devices - post install

Hi everyone.

I have a machine which upon to recently only had one hard disk. Now I have another one identical in size and speed and want create a raid set from those two.

The partition layout is that I have three partitions, first one for /boot, the second for / and then a huge LVM partition with several logical volumes.

I suspect that the correct way of proceeding would be to partition the second disk in three partitions with the same size but with partition type linux-raid, create the md-devices and add them to the array. Mount and copy from the current one to the second disk and then boot from that array and finally add the orginal disk to the newly created array.

This is fine for the /boot and / partitions since they contain a regular file system, but how is this done with the LVM partition. If I create a new Volume group and volumes don't I mess up the configuration? Is the correct way perhaps to just dd the data from the orginal partition to the newly created raid set? Anyone ever done this here?

Rgds, Sprellarinn
 

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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)
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