Creating swap partitions

How to create swap partitions

Step1: [root@localhost ~]# fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000030ad

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 523 4096575 83 Linux
/dev/sda3 524 905 3068415 83 Linux
/dev/sda4 906 1305 3213000 5 Extended
/dev/sda5 906 1032 1020096 83 Linux
/dev/sda6 1033 1096 514048+ 82 Linux swap / Solaris
/dev/sda7 1097 1109 104391 83 Linux
/dev/sda8 1110 1122 104391 83 Linux
[root@localhost ~]#

Step2: [root@localhost ~]# fdisk /dev/sda

The number of cylinders for this disk is set to 1305.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): n
First cylinder (1123-1305, default 1123):
Using default value 1123
Last cylinder or +size or +sizeM or +sizeK (1123-1305, default 1305): +100M

Step3: Command (m for help): l

0 Empty 1e Hidden W95 FAT1 80 Old Minix be Solaris boot
1 FAT12 24 NEC DOS 81 Minix / old Lin bf Solaris
2 XENIX root 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
5 Extended 41 PPC PReP Boot 85 Linux extended c7 Syrinx
6 FAT16 42 SFS 86 NTFS volume set da Non-FS data
7 HPFS/NTFS 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / .
8 AIX 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility
9 AIX bootable 4f QNX4.x 3rd part 8e Linux LVM df BootIt
a OS/2 Boot Manag 50 OnTrack DM 93 Amoeba e1 DOS access
b W95 FAT32 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O
c W95 FAT32 (LBA) 52 CP/M 9f BSD/OS e4 SpeedStor
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs
f W95 Ext'd (LBA) 54 OnTrackDM6 a5 FreeBSD ee EFI GPT
10 OPUS 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/
11 Hidden FAT12 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b
12 Compaq diagnost 5c Priam Edisk a8 Darwin UFS f1 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor a9 NetBSD f4 SpeedStor
16 Hidden FAT16 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fd Linux raid auto
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fe LANstep
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid ff BBT
1c Hidden W95 FAT3 75 PC/IX

Step4: Command (m for help): t
Partition number (1-9): 9
Hex code (type L to list codes): 82 ( Code 82 Linux swap)
Changed system type of partition 9 to 82 (Linux swap / Solaris)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.

Step5: [root@localhost ~]# mkswap /dev/sda9 (to create swap file system)
Setting up swapspace version 1, size = 106889 kB
no label, UUID=b6bffd7b-bea9-4236-a7cf-3be7fd241dc9

Step6: To permanently mount the partitions in /etc/fstab

/dev/sda9 swap swap defaults 0 0

Step7: [root@localhost ~]# swapoff -a
[root@localhost ~]# swapon -a
[root@localhost ~]# swapon -s
Filename Type Size Used Priority
/dev/sda6 partition 514040 0 -2
/dev/sda9 partition 104380 0 -3

Note: It read all these entries from
[root@localhost ~]# cat /proc/swaps
Filename Type Size Used Priority
/dev/sda6 partition 514040 0 -2
/dev/sda9 partition 104380 0 -3