-bash-4.1$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/Sys-root 1008M  212M  745M  23% /
tmpfs                  60G  496K   60G   1% /dev/shm
/dev/vda1             194M   32M  153M  17% /boot
/dev/mapper/Sys-home  4.0G  158M  3.6G   5% /home
/dev/mapper/Sys-opt    60G  757M   56G   2% /opt
/dev/mapper/Sys-tmp   2.0G   68M  1.9G   4% /tmp
/dev/mapper/Sys-usr   4.0G  1.1G  2.8G  27% /usr
/dev/mapper/Sys-var   4.0G  515M  3.3G  14% /var
/dev/mapper/Sys-crash
                      4.0G  137M  3.7G   4% /var/crash
/dev/mapper/Sys-log   2.0G  1.3G  642M  67% /var/log
/dev/mapper/Sys-vtmp 1008M   34M  924M   4% /var/tmp
/dev/mapper/Sys-mysqllog
                     1008M  844M  114M  89% /mysqllog
[PS]磁盘报警了，nagios不停的报警
/dev/mapper/Sys-mysqldata
                      394G  108G  267G  29% /mysqldata
ntapdc4ac1-nnas:/nucleus/prd/map_backups/mapc01
                      1.2T  886G  280G  77% /mysqlbackup
 
 
-bash-4.1$ 
-bash-4.1$ 
-bash-4.1$ 
-bash-4.1$ 
-bash-4.1$ 
-bash-4.1$ du -sh /mysqllog
5.9M /mysqllog

可是这里为什么只占据了5.9M，不到总空间1G的10%呢？奇怪的现象啊。