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shrinking root partition and using free space to create a block device

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Operating Systems Linux shrinking root partition and using free space to create a block device
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Old 02-03-2009
shrinking root partition and using free space to create a block device
We are intending to protect a set of user specified files using LVM mirroring where the protected space on which the user files are stored is mirrored on an LV on a different disk. Our problem is that for a user with a custom layout has installed linux with 2 partitons for swap and / and there is no other space available on the primary disk where we can store the files to be protected tht is mirrored across other disk, so we intend to allocate some space on the primary disk that can be used as a LV that is mirrored across an LV on different disk.
What can be done in this situation?
For now we thought of the following:
1> Shrinking the root partition to get some unallocated space that can be used to create a PV.
problems :
a. How do u do it? Can gparted be used online without the live CD?
b. How much can the root be compressed without the OS failure?
2> Can the root partition be converted into a LV?
3> There is free space on the root partition. Now can we use this free space to create a block device that can be converted into PV that would contain my protected files mirrored across other LV on a different disk. If so how can we do it?
Can anyone help me with this?
Thanks a lot.
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LEARN ABOUT REDHAT

resize_reiserfs

RESIZE_REISERFS(8)					      System Manager's Manual						RESIZE_REISERFS(8)

NAME

       resize_reiserfs - Reiserfs filesystem resizer

SYNOPSIS

       resize_reiserfs [ -s [+|-]size[K|M|G] ] [ -j dev ] [ -fqv ] device

DESCRIPTION

       The  resize_reiserfs tool resizes an unmounted reiserfs file system.  It enlarges or shrinks an reiserfs file system located on a device so
       that it will have size bytes or size=old_size +(-) size bytes if the + or - prefix is used.   If  the  -s  option  is  not  specified,  the
       filesystem  will  be  resized to fill the given device.	The size parameter may have one of the optional modifiers K, M, G, which means the
       size parameter is given in kilo-, mega-, gigabytes respectively.

       The resize_reiserfs program does not manipulate the size of the device. If you wish to enlarge a filesystem, you must make sure you  expand
       the  underlying	device	first.	This can be done using cfdisk(8) for partitions, by deleting the partition and recreating it with a larger
       size (assuming there is free space after the partition in question).  Make sure you re-create it with the same starting	disk  cylinder	as
       before!	Otherwise, the resize operation will certainly not work, and you may lose your entire filesystem.

       The resize_reiserfs program allows to grow a reiserfs on-line if there is a free space on block device.

       If  you wish to shrink an reiserfs partition, first use resize_reiserfs to shrink the file system. You may then use cfdisk(8) to shrink the
       device. When shrinking the size of the device, make sure you do not make it smaller than the reduced size of the reiserfs filesystem.

OPTIONS

       -s [+|-]size
	      Set the new size in bytes.

       -j dev Set the journal device name.

       -f     Force, do not perform checks.

       -q     Do not print anything but error messages.

       -v     Turn on extra progress status messages (default).

RETURN VALUES

       0    Resizing successful.

       -1   In another case.

EXAMPLES

       The following example shows how to test resize_reiserfs.  Suppose 2Gb reiserfs filesystem is created on the device /dev/hda8 and is mounted
       on /mnt.  For shrinking the device we need to unmount it first, then run resize_reiserfs with a size  parameter (in this case -1Gb):

	    df
	    umount /mnt
	    resize_reiserfs -s -1G /dev/hda8
	    mount /dev/hda8 /mnt
	    df /mnt

WARNING

       Note that this is a BETA program and may corrupt filesystems.

AUTHOR

       This version of resize_reiserfs has been written by Alexander Zarochentcev <zam@namesys.com>.

BUGS

       Please, report about the bugs to Alexander Zarochentcev <zam@namesys.com> or to Hans Reiser <reiser@namesys.com>.

SEE ALSO

       cfdisk(8), reiserfsck(8), debugreiserfs(8)

Reiserfsprogs-3.6.4						   January 2002 						RESIZE_REISERFS(8)