Linux-添加swap分区
FruitDrop 2018-08-12
建立一个普通的Linux分区（主分区、逻辑分区均可）
fdisk /dev/sdb
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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
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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.
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格式化交换分区
mkswap /dev/sdb6
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Setting up swapspace version 1, size = 4194204 KiB
no label, UUID=40eff2c0-3f6b-440e-bc2a-f71d3d5581a7
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启用交换分区
swapon /dev/sdb6
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查看交换分区加载状态
free
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total used free shared buffers cached
Mem: 1030108 160768 869340 264 12040 56188
-/+ buffers/cache: 92540 937568
Swap: 6291352 0 6291352
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停用交换分区
swapoff /dev/sdb6
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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
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//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
