fdisk /dev/sdb Command (m for help): p Disk /dev/sdb: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders, total 16777216 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: 0x740e36e3 Device Boot Start End Blocks Id System /dev/sdb1 63 4194367 2097152+ 83 Linux /dev/sdb2 4194368 16777215 6291424 5 Extended /dev/sdb5 4194431 8388735 2097152+ 83 Linux /dev/sdb6 8388799 16777215 4194208+ 83 Linux
以sdb6为例，可以看到分区的十六进制编码是83，即普通的Linux分区。
修改分区类型的十六进制编码
//t命令：改写分区十六进制编码 Command (m for help): t Partition number (1-6): 6 //L命令可以查看不同分区的十六进制编码，交换分区为82 Hex code (type L to list codes): 82 Changed system type of partition 6 to 82 (Linux swap / Solaris) Command (m for help): p Disk /dev/sdb: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders, total 16777216 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: 0x740e36e3 Device Boot Start End Blocks Id System /dev/sdb1 63 4194367 2097152+ 83 Linux /dev/sdb2 4194368 16777215 6291424 5 Extended /dev/sdb5 4194431 8388735 2097152+ 83 Linux /dev/sdb6 8388799 16777215 4194208+ 82 Linux swap / Solaris //分区表写入磁盘并退出 Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.
格式化交换分区
mkswap /dev/sdb6 Setting up swapspace version 1, size = 4194204 KiB no label, UUID=40eff2c0-3f6b-440e-bc2a-f71d3d5581a7
启用交换分区
swapon /dev/sdb6
查看交换分区加载状态
free
total used free shared buffers cached
Mem: 1030108 160768 869340 264 12040 56188
-/+ buffers/cache: 92540 937568
Swap: 6291352 0 6291352
停用交换分区
swapoff /dev/sdb6
p.s.
不能直接使用mount命令挂载swap分区，因为swap分区是没有挂载点的。
直接修改/etc/fstab配置文件，使系统启动时自动挂载：
/dev/sdb6 swap swap defaults 0 0 //查看交换分区 swapon -s Filename Type Size Used Priority /dev/sda2 partition 2097148 0 -1 /dev/sdb6 partition 4194204 0 -2
