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Operating Systems Linux How to increase root space from another partition? Post 302820379 by alister on Wednesday 12th of June 2013 02:51:17 PM
Old 06-12-2013
While I use Linux daily, I don't use it heavily and I do not consider myself expert in its internals. I have an obsolete Debian installation on obsolete hardware. I use it almost everyday to quickly test code for portability, but I have not installed a Linux distribution in 7 years (discounting test driving the occasional livecd).

My linux machine uses three hard disk partitions: /, /home, and swap. Admittedly, that's not quite the one large partition scenario I mentioned in my previous post, but it's close. Most disk activity is confined to the root partition. There's not much going on in /home, aside from creating a few files a day, and having the shell write to its history file. I don't use X, just a the virtual text consoles. The machine never swaps (I'd know if it was thrashing). However, the system startup scripts start mysqld, lighttpd, memcached, and php. They generate quite a bit of activity on the root partition (/var mostly).

At least several times a month, in a hurry I force a hard shutdown (it's 15 yr old hardware). At other times, adverse weather causes a reboot (brown out without UPS). Still, in 7 years, the machine has never failed to reboot (although, obviously, it may have to fsck).

I also do the same with a Windows XP laptop. Never had any issues rebooting or losing data (after having closed all documents and apps except the web browser with its session management).

Perhaps I've been uncommonly lucky. Which, I may be. In 25 years, I've never experienced a personal hard drive failure <knock on wood>.

I will continue to tempt the fates until they bite me. Smilie

Regards,
Alister
 

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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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