Linux新增SWAP

1、  建立SWAP目錄

[root@node2 ~]# mkdir /u01/swapdir

2、  建立SWAP檔案

[root@node2 ~]# dd if=/dev/zero of=/u01/swapdir/myswap bs=1M count=2048

2048+0 records in

2048+0 records out

2147483648 bytes (2.1 GB) copied, 24.4351 seconds, 87.9 MB/s

[root@node2 ~]# ll -h /u01/swapdir/myswap

-rw-r--r-- 1 root root 2.0G May  4 19:40 /u01/swapdir/myswap

[root@node2 ~]#

3、  將檔案做成SWAP的格式

[root@node2 ~]# mkswap /u01/swapdir/myswap

Setting up swapspace version 1, size = 2147479 kB

[root@node2 ~]#

4、  掛載

[root@node2 ~]# vi /etc/fstab

 

/dev/VolGroup00/LogVol00 /                       ext3    defaults        1 1

/dev/VolGroup00/LogVol00 /                       ext3    defaults        1 1

LABEL=/boot             /boot                   ext3    defaults        1 2

tmpfs                   /dev/shm                tmpfs   defaults        0 0

devpts                  /dev/pts                devpts  gid=5,mode=620  0 0

sysfs                   /sys                    sysfs   defaults        0 0

proc                    /proc                   proc    defaults        0 0

/dev/VolGroup00/LogVol01 swap                    swap    defaults        0 0

/dev/u01vg/u01lv       /u01                    ext3     defaults        0 0

/u01/swapdir/myswap    swap                    swap      defaults      0  0

~

~

~

5、  更新SWAP資訊

[root@node2 ~]# free

             total       used       free     shared    buffers     cached

Mem:       1762552    1701336      61216          0      15620    1605372

-/+ buffers/cache:      80344    1682208

Swap:      2097144          0    2097144

[root@node2 ~]# swapon -a

[root@node2 ~]# free

             total       used       free     shared    buffers     cached

Mem:       1762552    1702204      60348          0      15668    1605388

-/+ buffers/cache:      81148    1681404

Swap:      4194288          0    4194288

[root@node2 ~]#