Linux下Swap空间的添加

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Linux下Swap空间的添加
环境：CentOS 6.2

author:  youseesan
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mkdir /var/swap

---创建指定大小的文件file.swp  1024字节 65536/1024=64M
[root@localhost ~]# dd if=/dev/zero of=/var/swap/file.swp bs=1024 count=65536
记录了65536+0 的读入
记录了65536+0 的写出
67108864字节(67 MB)已复制，1.05399 秒，63.7 MB/秒
[root@localhost ~]#

----UUID=7b2d46b8-6448-43d5-86e0-fffa0c798965作为卷标
[root@localhost ~]# mkswap /var/swap/file.swp
mkswap: /var/swap/file.swp: warning: don't erase bootbits sectors
        on whole disk. Use -f to force.
Setting up swapspace version 1, size = 65532 KiB
no label, UUID=7b2d46b8-6448-43d5-86e0-fffa0c798965

vi /etc/fstab --添加下面一行,系统启动后自动加载
---------------------------------------------------------------------------------
/var/swap/file.swp         swap         swap    defaults        0 0
---------------------------------------------------------------------------------

[root@localhost ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          1266        364        901          0         17        181
-/+ buffers/cache:        165       1100
Swap:         2918          0       2918
[root@localhost ~]#

---开启swap添加
[root@localhost ~]# swapon /var/swap/file.swp
[root@localhost ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          1266        364        901          0         17        181
-/+ buffers/cache:        165       1100
Swap:         2982          0       2982
[root@localhost ~]#

---关闭swap添加
[root@localhost ~]# swapoff /var/swap/file.swp
[root@localhost ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          1266        364        901          0         17        181
-/+ buffers/cache:        165       1100
Swap:         2918          0       2918
[root@localhost ~]#