Resizing Logical Partition, creating new partition

thallium · 11-11-2012, 05:30 AM

So here is what I'm trying to do with my harddisk.

When I installed ubuntu, I gave it an 80GB partition on a 500GB drive, so if I crashed my OS, I would in theory not lose my pile of data.

I have ubuntu installed and would now like to create that data partiion on the remaining 420GB. What is the best way to go about this?

Currently the OS says my hard disk has an extended partition out to 500GB and an logical partition out to 500GB also!

running fdisk -l shows that I do have a /dev/mapper/...-root size of 77.9GB and -swap of 2.1GB.

catkin · 11-11-2012, 05:34 AM

Please post the output of

Code:

df -h
fdisk -l /dev/sda

thallium · 11-11-2012, 05:52 AM

#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/.............. -root 73G 6.4G 63G 10% /
udev 992M 4.0K 992M 1% /dev
tmpfs 401M 476K 400M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 1001M 0 1001M 0% /run/shm
/dev/sdb1 228M 25M 192M 12% /boot

fdisk -l /dev/sdb

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000c7a51

Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 499711 248832 83 Linux
/dev/sdb2 501758 976771071 488134657 5 Extended
Partition 2 does not start on physical sector boundary.
/dev/sdb5 501760 976771071 488134656 8e Linux LVM

catkin · 11-11-2012, 07:57 AM

Here it is again, lined up for legibility

Code:

#df -h
Filesystem                      Size Used Avail Use% Mounted on
/dev/mapper/.............. -root 73G 6.4G   63G  10% /
udev                            992M 4.0K  992M   1% /dev
tmpfs                           401M 476K  400M   1% /run
none                            5.0M    0  5.0M   0% /run/lock
none                           1001M    0 1001M   0% /run/shm
/dev/sdb1                       228M  25M  192M  12% /boot

fdisk -l /dev/sdb

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000c7a51

Device Boot  Start       End    Blocks Id System
/dev/sdb1 *   2048    499711    248832 83 Linux
/dev/sdb2   501758 976771071 488134657  5 Extended
Partition 2 does not start on physical sector boundary.
/dev/sdb5   501760 976771071 488134656 8e Linux LVM

Curious that it is /dev/sdb, not sda ... ?

It looks as if you have ~500 GB for LVM and only ~75 GB used plus whatever is used for swap. The obvious thing to do would be to create another logical volume (that's an LVM logical volume, not to be confused with a logical partition).

Here are some LVM links

thallium · 11-11-2012, 02:37 PM

Thanks, that helps a lot. A few more questions.

When I perform lvcreate, it seems to only let me create a logical volume ~100GB in size. Is this a limitation of LVM for creating logical volumes inside a volume group?

catkin · 11-11-2012, 08:21 PM

No.

Maybe the space is already allocated. Use the vgdisplay and lvdisplay commands to see usage.