Why inodes is almost full on file system?

Issue/Symptom  : dfm: Warning event on filer:/(Inodes Almost Full)
■ OS Environment : Netapp OnTAP 8.1
■ Software/Application : Netapp DFM[5] sends alert that inode is full.
■ Environment : Applicable to all customer who uses netapp filers
■ Investigation : Huge number of small files are put on volumes

■ Workaround Solution :

Check how is the usage of inodes : 

filer> df -i 

Check currently maximum setup :

filer> maxfiles 

Calculate maximum number of inodes it can hold [4KB size of each inode]

Find maximum size of volume :

filer> df -h  

If maximum size is  XY GB, then maximum supported inodes :

= (XY*1024*1024)/4

Set new inode value :

filer>maxfiles   

■ Permanent solution  : Same as workaround solution.
■ Root Cause Analysis : No required, is known.