--查看交换分区
[root@node1 ~]# free -m
total used free shared buffers cached
Mem: 2026 1722 303 0 39 1584
-/+ buffers/cache: 98 1928
Swap: 2047 0 2047
使用dd创建交换分区
创建一个大小为2G的文件到/u01：
dd if=/dev/zero of=/u01/swf1 bs=1024k count=2048
把这个文件变成swap文件：
Mkswap -c /u01/swf1
启用这个swap文件：
swapon /u01/swf1
编辑/etc/fstab文件，使在每次开机时自动加载swap文件：
/u01/swf1 swap swap default 0 0
使用fdisk增加交换分区
--查看空余分区，发现共享盘有有一个分区没有使用
[root@node1 ~]# fdisk -l
[root@node1 ~]# fdisk /dev/sdb
The number of cylinders for this disk is set to 2610.
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): p
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 123 987966 83 Linux
/dev/sdb2 124 246 987997+ 83 Linux
/dev/sdb3 247 369 987997+ 83 Linux
/dev/sdb4 370 2610 18000832+ 5 Extended
/dev/sdb5 370 978 4891761 83 Linux
/dev/sdb6 979 1587 4891761 83 Linux
/dev/sdb7 1588 1953 2939863+ 83 Linux
/dev/sdb8 1954 2319 2939863+ 83 Linux
/dev/sdb9 2320 2610 2337426 83 Linux
Command (m for help): t
Partition number (1-9): 9
Hex code (type L to list codes): L
0 Empty 1e Hidden W95 FAT1 80 Old Minix bf Solaris
1 FAT12 24 NEC DOS 81 Minix / old Lin c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 82 Linux swap / So c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 83 Linux c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 84 OS/2 hidden C: c7 Syrinx
5 Extended 41 PPC PReP Boot 85 Linux extended da Non-FS data
6 FAT16 42 SFS 86 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS 4d QNX4.x 87 NTFS volume set de Dell Utility
8 AIX 4e QNX4.x 2nd part 88 Linux plaintext df BootIt
9 AIX bootable 4f QNX4.x 3rd part 8e Linux LVM e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 93 Amoeba e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 94 Amoeba BBT e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M 9f BSD/OS eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi ee EFI GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a5 FreeBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a6 OpenBSD f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a7 NeXTSTEP f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a8 Darwin UFS f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor a9 NetBSD f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys ab Darwin boot fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
Hex code (type L to list codes): 82
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.
Syncing disks.
[root@node1 ~]# mkswap /dev/sdb9
Setting up swapspace version 1, size = 2393518 kB
[root@node1 ~]# swapon /dev/sdb9
[root@node1 ~]# free -m
total used free shared buffers cached
Mem: 2026 1733 292 0 44 1588
-/+ buffers/cache: 100 1926
Swap: 4330 0 4330
关闭swap文件
Swapoff /u01/swaf1