Hi,
Is there a restriction in the number of inodes a particular directory can have in Solaris.
If so how can we determine that.

Regards

It is the limitation of the file system. Here is a sample output

$ df -F ufs -o i /var
Filesystem             iused   ifree  %iused  Mounted on
/dev/dsk/c3t0d0s5      62795  665205     9%   /var

Hi,

If the inodes are 100% full what is the way to free some.
Is removing the older files only option or moving multiple files in a folder at the same location will also help in freeing some inodes.

Regards

If you are hitting 100% in i-node utilisation, you will not be able to create any file. The worst scenario will be your / (root) file system hit 100% and system may crash. That's why system administrator will normally partition /var /usr .. separately to avoid such scenario from happening.

If you monitor your system messages, you will see 'out of inodes'

The cause and action described in this link will definitely help you to understand the issue.

Chapter 2 Alphabetical Message Listing (Solaris Common Messages and Troubleshooting Guide)