Linux 挂载Swap
创建Swap设备
//这里需要创建一个新的硬盘
可以进入到fdisk -l 中查看
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 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: 0x000b7401
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 616447 307200 83 Linux
/dev/sda2 616448 37814271 18598912 83 Linux
/dev/sda3 37814272 41943039 2064384 82 Linux swap / Solaris
Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 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: 0xd18730f4
Device Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 82 Linux swap / Solaris
/dev/sdb2 4196352 10479615 3141632 83 Linux
/dev/sdb3 10479616 14673919 2097152 83 Linux
[root@localhost ~]#
#fdisk /dev/sd
m for help p for print n for add w for save
输入n 回车;输入 P 回车 选择primary ;输入3 回车 回车这里最好选择默认的表头防止磁盘浪费,输入+??M的大小,输入t 修改系统ID ,输入1 回车 输入82 回车,(这里改成swap的ID) ,输入w回车
#partprobe //让内核更新分区表
#mkswap /dev/sdb3 //构建swap格式
2.挂载Swap
#free //确认当前swap分区的大小
#swapon /dev/sdb3
#free //确认大小增加了????M
[root@localhost ~]# free
total used free shared buffers cached
Mem: 1026004 598852 427152 0 52436 388212
-/+ buffers/cache: 158204 867800
Swap: 2064380 0 2064380
[root@localhost ~]# swapon /dev/sdb3
[root@localhost ~]# free
total used free shared buffers cached
Mem: 1026004 585964 440040 0 52440 388208
-/+ buffers/cache: 145316 880688
Swap: 4161528 0 4161528
#swapon -s //列出目前使用的swap设备有哪些
Filename Type Size Used Priority
/dev/sda3 partition 2064380 0 -1
/dev/sdb3 partition 2097148 0 -2
//同样可以使用文件构建swap
#dd if=/dev/zero of=/tmp/swap bs=1M count=128
#mkswap /tmp/swap
#swapon /tmp/swap
//卸载swap设备
#swapoff /tmp/swap
#swapoff /dev/sdb3 //关掉swap
#free
*total used free shared buffers cached
Mem: 1026004 583708 442296 0 52436 388208
-/+ buffers/cache: 143064 882940
Swap: 2064380 0 2064380*