1、卸载时报一个错：

# umount /gfs/sysdisk/

umount: /gfs/sysdisk: device is busy.

        (In some cases useful info about processes that use

         the device is found by lsof(8) or fuser(1))

2、分析：有进程占有

3、解决

a、查处占有的进程

# fuser -m /gfs/sysdisk/

/gfs/sysdisk/:        3539c

b、kill掉次进程

# kill -9 3539

c、再次卸载成功