查看已经删除的文件，空间有没有释放，没有的话kill掉pid

lsof -n |grep deleted

lsof简介lsof(list open files)是一个列出当前系统打开文件的工具。

问题描述：

服务报警根分区使用率超过95%，上来查看发现96%使用率；

但是/分区下面的目录，每个查询加起来也不到4G空间，多出来的40G不知道在哪里？

find查询也没有找到大文件；

分析原因：

可能是系统进程占用的空间没有释放掉，导致的；

通过命令查看发现，php进程一共有3个，都是处于deleted状态，文件大小刚好是40G，正好是多出来的空间，找到问题所在；

解决办法：

找到对应的php进程号，kill掉即可；

[root@host127WebServer]#lsof-n/|grepdeletedmysqld2660mysql4uREG8,20524290/tmp/ibSF7sXt(deleted)mysqld2660mysql5uREG8,20524305/tmp/ibCCM4u4(deleted)mysqld2660mysql6uREG8,20524309/tmp/ibKuAG2E(deleted)mysqld2660mysql7uREG8,20524315/tmp/ibcLe4Bf(deleted)mysqld2660mysql11uREG8,20524316/tmp/ibW2n1iQ(deleted)php7045root0rREG8,21172524374/tmp/sh-thd-1494029191(deleted)php7045root2wREG8,242413952626657428/var/spool/at/spool/a0100c017bf37c(deleted)php7054root0rREG8,21172524374/tmp/sh-thd-1494029191(deleted)php7054root2wREG8,242413952626657428/var/spool/at/spool/a0100c017bf37c(deleted)php12730root0rREG8,21172524374/tmp/sh-thd-1494029191(deleted)php12730root2wREG8,242413952626657428/var/spool/at/spool/a0100c017bf37c(deleted)mysqld17855mysql4uREG8,20524384/tmp/ibxBS5jf(deleted)mysqld17855mysql5uREG8,20524385/tmp/ibmrNzfL(deleted)mysqld17855mysql6uREG8,20524386/tmp/ibVDS3ah(deleted)mysqld17855mysql7uREG8,20524387/tmp/ibx6YTrj(deleted)mysqld17855mysql13uREG8,20524388/tmp/ibOhb8xQ(deleted)

在对应的目录下并没有发现文件

[root@host127 WebServer]# ll /var/spool/at/spool/

总用量 0

[root@host127 WebServer]# kill -9 7045

[root@host127 WebServer]# kill -9 7054

[root@host127 WebServer]# kill -9 12730

再次查看发现没有php的进程

[root@host127 WebServer]# lsof -n / |grep deleted

mysqld 2660mysql4uREG8,2 0 524290 /tmp/ibSF7sXt (deleted)

mysqld 2660mysql5uREG8,2 0 524305 /tmp/ibCCM4u4 (deleted)

mysqld 2660mysql6uREG8,2 0 524309 /tmp/ibKuAG2E (deleted)

mysqld 2660mysql7uREG8,2 0 524315 /tmp/ibcLe4Bf (deleted)

mysqld 2660mysql11uREG8,2 0 524316 /tmp/ibW2n1iQ (deleted)

mysqld17855mysql4uREG8,2 0 524384 /tmp/ibxBS5jf (deleted)

mysqld17855mysql5uREG8,2 0 524385 /tmp/ibmrNzfL (deleted)

mysqld17855mysql6uREG8,2 0 524386 /tmp/ibVDS3ah (deleted)

mysqld17855mysql7uREG8,2 0 524387 /tmp/ibx6YTrj (deleted)

mysqld17855mysql13uREG8,2 0 524388 /tmp/ibOhb8xQ (deleted)

查看空间已经恢复：

[root@host127WebtServer]#df-h文件系统容量已用可用已用%%挂载点/dev/sda249G4.4G42G10%/tmpfs16G016G0%/dev/shm