To recap, root FS has run out of space and data contained on it couldn't be removed or compressed to free up the space. Since there was swap space, so I planned to reclaim from the swap partition without losing the data and would extend the space for root file system.
Host : susenode2
OS : SuSE 11 / CentOS / Redhat
Disk : sda
It could have been easy we could have extended volume using LVM, since our disks are not under LVM, we are here trying to re-create the entire partition without losing data.
Current scenario :
Disk (sda) is been into 3 partitons, of which sda1, sda2 are my data partitions & sda3 swap partition. I would recreate the swap partition and would extend the root file system. It could also be seen that the sector are contiguous between sda2 and sda3 hence I could destroy those two partitions and re-create.
df & fdisk & swap output :
susenode2:~ # df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext3 13G 12G 570M 96% /
udev tmpfs 369M 128K 369M 1% /dev
tmpfs tmpfs 369M 0 369M 0% /dev/shm
/dev/sda1 ext3 1.1G 1015M 18M 99% /application/logs
susenode2:~ #
susenode2:~ # fdisk -l /dev/sda
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000cc8af
Device Boot Start End Blocks Id System
/dev/sda1 2048 2265087 1131520 83 Linux
/dev/sda2 * 2265088 31625215 14680064 83 Linux <<=== root fs
/dev/sda3 31625216 41943039 5158912 82 Linux swap / Solaris <<=== swap
susenode2:~ #
susenode2:~ # swapon -s
Filename Type Size Used Priority
/dev/sda3 partition 5158908 0 -1
susenode2:~ #
Since we are resizing the root file system, we need to get into rescue environment to do so.
I am using an SuSE DVD or you could also use knoppix and would get into rescue environment and make necessary changes to the partition table.
I would delete the partition sda2 and sda3 and would recreate the sda2 from the sector which was at the start i..e 2265088 and would end for my required size say 18G which I would add to this file system.
I would later create a new partition for the swap for remaining space.
snaps are as below :
Once partition are created we need to change the type of the partition to swap for sda3 and since sda2 was bootable, make sure you would toggle boot flag on the partition.
Make sure you now has enough space in the disk where you could resize your root file system and make the swap partition.
Rescue:~ # mkswap /dev/sda3
Rescue:~ # reboot
After reboot, check your root file system space. It would have been increased and swap space decreased.
Snap after increasing file system :
susenode2:~ # df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext3 18G 12G 5.3G 69% /
udev tmpfs 369M 128K 369M 1% /dev
tmpfs tmpfs 369M 0 369M 0% /dev/shm
/dev/sda1 ext3 1.1G 1015M 18M 99% /application/logs
susenode2:~ #
susenode2:~ # fdisk -l /dev/sda
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000cc8af
Device Boot Start End Blocks Id System
/dev/sda1 2048 2265087 1131520 83 Linux
/dev/sda2 * 2265088 40013823 18874368 83 Linux
/dev/sda3 40013824 41943039 964608 82 Linux swap / Solaris
susenode2:~ #
susenode2:~ # swapon -s
Filename Type Size Used Priority
/dev/sda3 partition 964604 0 -1
susenode2:~ #
Thanks
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