centos 磁盘空间不足

今天磁盘报警，空间不足，找了很久没查出来。

下面说下我的操作步骤

[root@monitor /]# du -sch /*
6.6M     /bin
39M     /boot
161M     /data
164K     /dev
12M     /etc
115M     /home
240M     /lib
25M     /lib64
20K     /lost+found
4.0K     /media
4.0K     /mnt
291M     /opt
du: cannot access `/proc/27198/task/27198/fd/4': No such file or directory
du: cannot access `/proc/27198/task/27198/fdinfo/4': No such file or directory
du: cannot access `/proc/27198/fd/4': No such file or directory
du: cannot access `/proc/27198/fdinfo/4': No such file or directory
0     /proc
206M     /root
11M     /sbin
4.0K     /selinux
4.0K     /srv
0     /sys
1.1M     /tmp
2.6G     /usr
1.4G     /var
5.1G     total

一共使用了5.1G磁盘，但是检查出已经使用15G

[root@monitor /]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       20G   15G  4.3G  78% /
tmpfs           1.9G  4.0K  1.9G   1% /dev/shm

很奇怪，问群里的大神说是XEN虚拟机运行java会遇到此bug，重启java程序就恢复正常

[root@monitor /]# killall java
[root@monitor /]# ps -ef |grep java
root     27766 26125  0 11:34 pts/0    00:00:00 grep java
[root@monitor /]# /etc/init.d/elasticsearch start
Starting elasticsearch:                                    [  OK  ]
[root@monitor /]# cd /usr/local/src/logstash-1.4.2/
[root@monitor logstash-1.4.2]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       20G  5.2G   14G  28% /
tmpfs           1.9G  4.0K  1.9G   1% /dev/shm
[root@monitor logstash-1.4.2]# bin/logstash -f conf/indexer.conf &
[1] 28116
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