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Operating Systems Linux How to increase root space from another partition? Post 302820295 by alister on Wednesday 12th of June 2013 12:49:35 PM
Old 06-12-2013
Quote:
Originally Posted by jegaraman
It is possibel and easy if you user Logical volumes .

Otherwise , we need to take back up of the root partition and reformat it.
While it never hurts to have a backup, your categorical statement regarding reformatting is incorrect. ext2, ext3, ext4, xfs, btrfs can all be grown (even while mounted, with >= 2.6 kernels). Perhaps other filesystems can be grown as well, but I did not check.

Obviously, if the filesystem currently occupies the full partition, the partition itself needs to be redefined. However, this is not a destructive operation; it merely modifies a value in the partition table. The partition starting point must obviously be preserved.

Quote:
Originally Posted by jegaraman
And also ...Why do you increase the root partition ...It is wise to have lesser space in root and allow it not to increase ....
I agree with this, but it's not something with which I ever concern myself for personal systems. I prefer the simplicity of one large partition. For a production machine, however, it's useful to be able to tune filesystems to their function (small number of large files or large number of small files?) and to mount each with as many restrictions as possible (noexec, nosuid, nodev, etc).

Regards,
Alister

Last edited by alister; 06-12-2013 at 01:54 PM..
 

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KPARTX(8)                                                  Linux Administrator's Manual                                                  KPARTX(8)

NAME
kpartx - Create device maps from partition tables SYNOPSIS
kpartx [-a | -d | -l] [-v] wholedisk DESCRIPTION
This tool, derived from util-linux' partx, reads partition tables on specified device and create device maps over partitions segments detected. It is called from hotplug upon device maps creation and deletion. OPTIONS
-a Add partition mappings -r Readonly partition mappings -r Read-only partition mappings -d Delete partition mappings -u Update partition mappings -l List partition mappings that would be added -a -p set device name-partition number delimiter -f force creation of mappings; overrides 'no_partitions' feature -g force GUID partition table (GPT) -v Operate verbosely -s Sync mode. Don't return until the partitions are created EXAMPLE
To mount all the partitions in a raw disk image: kpartx -av disk.img This will output lines such as: loop3p1 : 0 20964762 /dev/loop3 63 The loop3p1 is the name of a device file under /dev/mapper which you can use to access the partition, for example to fsck it: fsck /dev/mapper/loop3p1 When you're done, you need to remove the devices: kpartx -d disk.img SEE ALSO
multipath(8) multipathd(8) hotplug(8) AUTHORS
This man page was assembled By Patrick Caulfield for the Debian project. From documentation provided by the multipath author Christophe Varoqui, <christophe.varoqui@opensvc.com> and others. July 2006 KPARTX(8)
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