small files and hadoop's hdfs (bonus: an inode formula)

[hdfs@sandbox ~]$ hdfs dfs -count /
         248          510          560952712 /
Filesystem    1K-blocks     Used  Available Use% Mounted on
/dev/sdf1    3906486416 10586920 3700550300   1% /data04

Filesystem          Inodes  IUsed    IFree IUse% Mounted on
/dev/sdf1           953856 953856        0  100% /data04
[hdfs@sandbox finalized]$ pwd
/hadoop/hdfs/data/current/BP-1200952396-10.0.2.15-1398089695400/current/finalized
[hdfs@sandbox finalized]$ ls -al
total 49940
drwxr-xr-x 66 hdfs hadoop    12288 Apr 21 07:18 .
drwxr-xr-x  4 hdfs hadoop     4096 Jul  3 12:33 ..
-rw-r--r--  1 hdfs hadoop        7 Apr 21 07:16 blk_1073741825
-rw-r--r--  1 hdfs hadoop       11 Apr 21 07:16 blk_1073741825_1001.meta
-rw-r--r--  1 hdfs hadoop       42 Apr 21 07:16 blk_1073741826
-rw-r--r--  1 hdfs hadoop       11 Apr 21 07:16 blk_1073741826_1002.meta
-rw-r--r--  1 hdfs hadoop   392124 Apr 21 07:18 blk_1073741887
-rw-r--r--  1 hdfs hadoop     3071 Apr 21 07:18 blk_1073741887_1063.meta
-rw-r--r--  1 hdfs hadoop  1363159 Apr 21 07:18 blk_1073741888
-rw-r--r--  1 hdfs hadoop    10659 Apr 21 07:18 blk_1073741888_1064.meta
drwxr-xr-x  2 hdfs hadoop     4096 Apr 21 07:22 subdir0
drwxr-xr-x  2 hdfs hadoop     4096 Jun  3 08:45 subdir1
drwxr-xr-x  2 hdfs hadoop     4096 Apr 21 07:21 subdir63
drwxr-xr-x  2 hdfs hadoop     4096 Apr 21 07:18 subdir9