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[root@lxt lxt]# free -m
             total       used       free     shared    buffers     cached
Mem:           498        357        141          0         27        162
-/+ buffers/cache:        167        331
Swap:         1023          0       1023
2¡¢ÊäÈëdf -B M£¨»òdf -m£©²é¿´¸÷·ÖÇøµ±Ç°Ê¹ÓÃÇé¿ö
[root@lxt lxt]# df -B M
Îļþϵͳ               1M-¿é        ÒÑÓà    ¿ÉÓà ÒÑÓÃ% ¹ÒÔØµã
/dev/mapper/vg_lxt-lv_root
                        12875M     4059M     8162M  34% /
/dev/sda7                 194M       14M      170M   8% /boot
tmpfs                     250M        1M      249M   1% /dev/shm
£¨fdisk -l¿É²é¿´´ÅÅÌ·ÖÇøÇé¿ö£©
3¡¢Ñ¡ÔñÒ»¸ö½Ï´óµÄ·ÖÇø£¬½¨Á¢·ÖÇøÎļþ£º
[root@lxt lxt]# dd if=/dev/zero of=/swapadd bs=1024 co


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