服务器磁盘跑到100%，如何清除

[root@QA_Server81 mapper]# df  -l
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup00-rootvol
                      29741864  24001000   4205684  86% /
/dev/mapper/VolGroup00-varvol
                      49580256  35801976  11219100  77% /var
/dev/mapper/VolGroup00-optvol
                     163087624 129386352  25288892  84% /opt
/dev/mapper/VolGroup00-homevol
                      19838052   8878840   9935212  48% /home
/dev/sda1              4956284    148336   4552116   4% /boot
tmpfs                  4082508         0   4082508   0% /dev/shm

利用命令
[root@QA_Server81 mapper]# du -sh /*|sort -nr
300M    /mnt
296K    /tmppre_plugin_assign_detail.sql
292M    /tmp
144K    /dev
135M    /lib
124G    /opt
116M    /etc
92K     /hs_err_pid10402.log
48K     /1.json
37M     /sbin
34G     /var
23M     /lib64
16K     /lost+found
16G     /root
12K     /t_1.xml
8.5M    /bin
8.3G    /home
8.0K    /srv
8.0K    /selinux
8.0K    /media
7.1M    /boot
7.0G    /usr
4.0K    /wew.xml
4.0K    /wew.tpl
4.0K    /test.sh
4.0K    /test1.log
4.0K    /t_1.tpl
4.0K    /fgd.xml
4.0K    /fgd.tpl
4.0K    /6.tar.gz
4.0K    /2012
1.9M    /tmp.sql
0       /sys
0       /proc
0       /net
0       /misc
0       /eee

查看占用最大的目录

[root@QA_Server81 opt]# du -sh /opt/*|sort -nr
848K    /opt/lehecai_soccer_ftp
269M    /opt/dell
136K    /opt/lsi
106G    /opt/deploy
44M     /opt/jprofiler6
38M     /opt/syslog-ng
36K     /opt/script
16K     /opt/lost+found
8.8G    /opt/download
4.7G    /opt/App
1.9G    /opt/sphinx
1.9G    /opt/mfs

加磁盘

 pvdisplay 
 lvdisplay 
 lvextend -L +50G /dev/VolGroup00/optvol
 resize2fs /dev/VolGroup00/optvol
 df -lh