Dear Mr. Lakshmi Gopal,
Since I am not person form Hr Dept. my opinion may not suit you. I have heard in corporate culture, asking for even humen rights is also an ofence from the management eyes.
Here in your case you have taken two action at the same time, where as both the action has different purpose.
It is alway right that increament are given on the basis of last year performance of employees. Therefore it is true that if any increament is given that is a revord for the works already performed by employee.
Where as the increase in notice period is requirement of management, and it has not concern with the increament.
Management should inform their difficulties and requirements and convince all the key person individualy, to get better result. Symathetic attitude should be maintained form both the sides.
This is like a judjment that employees who are ready to accepat increase in notice period, will only be given increament. Otherwise not employee is eligiblae for increament.
If the purpose of motivation and to full fill the requirement of employees before he complaint /ask for,will not given preferance by HR, Employees will never look behind when he get an oportunity.
Therefore you should convince each emplyees seperatly for the increase in notice period, and not link with the performance of employees.
Thanks / Regards
ANIL