You can Check the inode usage on server using the below command and see how many used inodes there are.

# df -i

The flag -i is used for displaying Inode information.

Sample Output :-

root@serverxx [~]# df -i
Filesystem       Inodes   IUsed    IFree   IUse%  Mounted on
/dev/sda5        655360  655360        0   100%         /