Linux学习笔记(五)— 添加swap分区

建立一个普通的Linux分区(主分区、逻辑分区均可)
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
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