E: Write error - write (28 No space left on device)

1：在终端中运行cd命令，提示：

e: Write error - write (28 No space left on device)

E: Cant mmap an empty file

2：使用 df -h 查看磁盘空间情况：

/dev/xvda1       20G  20G  0G  100% /

3：继续查看大文件所在目录：#du --max-depth=1 -h  /

4.0K    /opt

9.6M    /bin

408K    /run

4.0K    /srv

4.0K    /lib64

0       /sys

9.0M    /sbin

34M     /boot

224K    /home

4.0K    /dev

du: cannot access ‘/proc/31292/task/31292/fd/4’: No such file or directory

du: cannot access ‘/proc/31292/task/31292/fdinfo/4’: No such file or directory

du: cannot access ‘/proc/31292/fd/4’: No such file or directory

du: cannot access ‘/proc/31292/fdinfo/4’: No such file or directory

0       /proc

284M    /lib

80K     /tmp

13G     /root

4.0K    /media

1.3G    /mnt

1.2G    /usr

16K     /lost+found

5.2G    /var

6.1M    /etc

21G     /

可见 /root下面存在大文件，继续查看：#du --max-depth=1 -h  /root

8.0K    /root/.ssh

13G     /root/.pm2

6.0M    /root/.forever

17M     /root/.npm

4.0K    /root/.cache

13G     /root

可见，大文件在.pm2下面，进入此目录进行查看：pm2# ll

total 13326616

drwxr-xr-x 4 root root        4096 May 11 21:20 ./

drwx------ 7 root root        4096 Aug 22 08:35 ../

-rw-r--r-- 1 root root        1561 Jun 20  2015 conf.js

-rw-r--r-- 1 root root       22557 Apr 19 00:28 dump.pm2

drwxr-xr-x 2 root root        4096 Apr 21 08:37 logs/

-rw-r--r-- 1 root root           2 Jun 20  2015 module_conf.json

drwxr-xr-x 2 root root        4096 Aug 22 08:38 pids/

-rw-r--r-- 1 root root 13646360576 Aug 22 08:38 pm2.log

-rw-r--r-- 1 root root           5 May 11 21:20 pm2.pid

srwxr-xr-x 1 root root           0 May 11 21:20 pub.sock=

srwxr-xr-x 1 root root           0 May 11 21:20 rpc.sock=

发现pm2.log日志文件为13G，将其删除。