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Operating Systems Linux shrinking root partition and using free space to create a block device Post 302283507 by kickdgrass on Tuesday 3rd of February 2009 11:41:19 AM
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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SVHLABEL(8)						    BSD System Manager's Manual 					       SVHLABEL(8)

NAME
svhlabel -- update disk label from SGI Volume Header SYNOPSIS
svhlabel [-fqrw] device DESCRIPTION
svhlabel is used to update a NetBSD disk label from the Silicon Graphics Volume Header on disks that were previously used on IRIX systems. svhlabel scans the Volume Header contained in the first blocks of the disk and generates additional partition entries for the disk from the entries found. Each Volume Header entry which does not have an equivalent partition in the disk label (equivalent in having the same size and offset) is added to the first free partition slot in the disk label. A free partition slot is defined as one with an fstype of 'unused' and a size of zero ('0'). If there are not enough free slots in the disk label, a warning will be issued. The raw partition (typically partition c, but d on i386 and some other platforms) is left alone during this process. By default, the proposed changed disk label will be displayed and no disk label update will occur. Available options: -f Force an update, even if there has been no change. -q Performs operations in a quiet fashion. -r In conjunction with -w, also update the on-disk label. You probably do not want to do this. -w Update the in-core label if it has been changed. SEE ALSO
disklabel(8), dkctl(8), mount_efs(8), sgivol(8) HISTORY
The svhlabel command appeared in NetBSD 5.0. BSD
February 26, 2007 BSD
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