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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
# 1  
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 OPENSOLARIS

addpart

ADDPART(8)                                                     System Administration                                                    ADDPART(8)

NAME

       addpart - tell the kernel about the existence of a partition

SYNOPSIS

       addpart device partition start length

DESCRIPTION

       addpart  tells the Linux kernel about the existence of the specified partition.  The command is a simple wrapper around the "add partition"
       ioctl.

       This command doesn't manipulate partitions on a block device.

PARAMETERS

       device The disk device.

       partition
              The partition number.

       start  The beginning of the partition (in 512-byte sectors).

       length The length of the partition (in 512-byte sectors).

SEE ALSO

       delpart(8), fdisk(8), parted(8), partprobe(8), partx(8)

AVAILABILITY

       The addpart command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux                                                         January 2015                                                         ADDPART(8)