Recently, one of my servers has started to show this message in syslog:

Aug 24 17:11:46 host-53-114 kernel: EXT4-fs warning (device md126p5): ext4_dx_add_entry: Directory index full!
Aug 24 17:11:46 host-53-114 kernel: EXT4-fs warning (device md126p5): ext4_dx_add_entry: Directory index full!
Aug 24 17:11:46 host-53-114 kernel: EXT4-fs warning (device md126p5): ext4_dx_add_entry: Directory index full!

The message Directory index full! sound like inode’s problem. Type the following command to check

# df -i

Output

Filesystem       Inodes    IUsed  IFree IUse% Mounted on
/dev/md126p5   29974528 29956913  17615  100% /
tmpfs           1003836    14913 988923    2% /dev/shm
/dev/md126p1     128016       44 127972    1% /boot
/dev/md126p3     262144       18 262126    1% /tmp

Maybe too much to fill up the inodes in the partition, so I need to find the directory

# cd /
# for dir in `ls -1`; do echo $dir; find ./$dir -type f|wc -l; done

Output

cache
33
db
0
empty
0
games
0
lib
4486
local
0
lock
11
log
104
mail
0
...

I found “/var/spool/postfix/maildrop/” has millions of files, so we need to delete. Have many case to delete millions of files but I highlight recommend following, the way is the fastest method to delete billions of files

# cd /var/spool/postfix/maildrop/
# nohup perl -e 'for(<*>){((stat)[9]<(unlink))}' &

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