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Old 01-18-2006, 11:49 AM   #1
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Registered: Jan 2006
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Migrate Directory to Separate Disk Partition

I am running Red Hat Linux Enterprise v4.0.

When I do a df -h to check for disk space, I have this configuration:

Filesystem Size Used Avail Use% Mounted on
/dev/sda9 2.0G 260M 1.7G 14% /
/dev/sda3 190M 12M 170M 7% /boot
none 1007M 0 1007M 0% /dev/shm
/dev/sda8 1012M 33M 928M 4% /tmp
/dev/sda5 9.7G 2.5G 6.7G 27% /usr
/dev/sda6 9.7G 126M 9.0G 2% /var
/dev/sda2 2.5G 1.3G 1.1G 54% /home
66G 3.5G 59G 6% /mnt/software
2.5G 1.9G 498M 80% /mnt/software


I'm unsure how to interpret all this. So, my questions are:

1) sda9 is mounted on '/'. But /tmp, /usr, /var, and /home, are directories under '/'. How can those directories be bigger than '/'?

2) How do I know how much un-partitioned space is available?

3) I have one mounted partition that is taking up 66G of space. How do I reduce the size of this partition and use the space to create a new partition? How do I reduce the size of the 66G partition and use the space to add to an existing partition? Will I lose any existing data?

I guess that's all for now. Thanks in advance for your assistance.
Old 01-18-2006, 01:51 PM   #2
Gato Azul
Registered: Sep 2003
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Distribution: CentOS, Ubuntu
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1) The /tmp /home and other directories are on separate partitions, each having a certain amount of space allocated to use. The / or /tmp just refers to a mount point and is meant to keep some sort of logical hierarchy. So even though your root partition is a separate partition in its own right, you have a /tmp partition that logically resides under the root partition, but in reality is an entirely separate storage area. Files that get put into /tmp aren't being stored in the root partition, just like files that are stored in the root directory wouldn't be stored in /tmp (unless explicitly put there).

2) You can use a command line utility such as fdisk, cfdisk, or parted, or if you want a graphical utility you could try out gparted, qtparted, or kparted.

3) I'd try using parted/gparted/kparted/qtparted. If you've ever used partition magic, they're quite similar to that program. As to whether or not you'll lose data, you shouldn't, but as always when changing hard drive disc configurations, make a backup of anything that you can't afford to lose.

Hope that helps!


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