centos磁盘Use100%，未找到可删除的大文件

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centos

1、df -h 查看硬盘使用情况，然后使用du -sh *命令删除大的文件，返回来查询依然使用率100%：

[root@**** /]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G   38G     0 100% /
tmpfs           1.9G     0  1.9G   0% /dev/shm

[root@iZ23c9tzxfmZ /]# du -sh *
7.6M    bin
49M     boot
160K    dev
44M     etc
4.0K    home
272M    lib
22M     lib64
16K     lost+found
4.0K    media
4.0K    mnt
8.0K    opt
du: cannot access `proc/2769/task/2769/fd/4': No such file or directory
du: cannot access `proc/2769/task/2769/fdinfo/4': No such file or directory
du: cannot access `proc/2769/fd/4': No such file or directory
du: cannot access `proc/2769/fdinfo/4': No such file or directory
0       proc
116K    root
15M     sbin
4.0K    selinux
4.0K    srv
0       sys
196K    tmp
1.8G    usr
1.3G    var

问题原因：删除文件后，文件删除进程未结束造成，使用 lsof |grep delete查看未结束进程，然后使用kill -9 结束进程

[root@iZ23c9tzxfmZ /]# lsof |grep delete
java        578   root    8w      REG              252,1           0    1324637 /usr/local/etc/apache-tomcat-9.0.12/logs/localhost.2019-06-07.log (deleted)
mysqld     1091  mysql    4u      REG              252,1           0     396339 /tmp/ib3ccYvb (deleted)
mysqld     1091  mysql    5u      REG              252,1           0     396341 /tmp/ibdSzxSO (deleted)
mysqld     1091  mysql    6u      REG              252,1           0     396342 /tmp/iby456es (deleted)
mysqld     1091  mysql    7u      REG              252,1           0     396401 /tmp/ibMTUnC5 (deleted)
mysqld     1091  mysql   11u      REG              252,1           0     396405 /tmp/ibfoSrxJ (deleted)
java       2693   root    1w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       2693   root    2w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       2693   root    7w      REG              252,1    92855255    1322738 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.2018-09-18.log (deleted)
java       2693   root    8w      REG              252,1       57824    1322739 /usr/local/etc/apache-tomcat-9.0.12/logs/localhost.2018-09-18.log (deleted)
java       2693   root    9w      REG              252,1           0    1324560 /usr/local/etc/apache-tomcat-9.0.12/logs/manager.2018-09-18.log (deleted)
java       2693   root   10w      REG              252,1           0    1324561 /usr/local/etc/apache-tomcat-9.0.12/logs/host-manager.2018-09-18.log (deleted)
java       2844   root    1w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       2844   root    2w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       2844   root    7w      REG              252,1    84798204    1320695 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.2019-07-26.log (deleted)
java       2844   root    8w      REG              252,1       57824    1322739 /usr/local/etc/apache-tomcat-9.0.12/logs/localhost.2018-09-18.log (deleted)
java       2844   root    9w      REG              252,1           0    1324560 /usr/local/etc/apache-tomcat-9.0.12/logs/manager.2018-09-18.log (deleted)
java       2844   root   10w      REG              252,1           0    1324561 /usr/local/etc/apache-tomcat-9.0.12/logs/host-manager.2018-09-18.log (deleted)
java       3933   root    1w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       3933   root    2w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       3933   root    7w      REG              252,1    92855255    1322738 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.2018-09-18.log (deleted)
java       3933   root    8w      REG              252,1       57824    1322739 /usr/local/etc/apache-tomcat-9.0.12/logs/localhost.2018-09-18.log (deleted)
java       3933   root    9w      REG              252,1           0    1324560 /usr/local/etc/apache-tomcat-9.0.12/logs/manager.2018-09-18.log (deleted)
java       3933   root   10w      REG              252,1           0    1324561 /usr/local/etc/apache-tomcat-9.0.12/logs/host-manager.2018-09-18.log (deleted)
java       7192   root    1w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       7192   root    2w      REG              252,1 36416065526    1322704 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.out (deleted)
java       7192   root    7w      REG              252,1   157118036    1324513 /usr/local/etc/apache-tomcat-9.0.12/logs/catalina.2018-09-20.log (deleted)
java       7192   root    8w      REG              252,1       37279    1310753 /usr/local/etc/apache-tomcat-9.0.12/logs/localhost.2018-09-20.log (deleted)
java       7192   root    9w      REG              252,1           0    1324516 /usr/local/etc/apache-tomcat-9.0.12/logs/manager.2018-09-20.log (deleted)
java       7192   root   10w      REG              252,1           0    1324517 /usr/local/etc/apache-tomcat-9.0.12/logs/host-manager.2018-09-20.log (deleted)

[root@iZ23c9tzxfmZ /]# kill-9 2693

[root@iZ23c9tzxfmZ /]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  3.6G   34G  10% /
tmpfs           1.9G     0  1.9G   0% /dev/shm

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