Hello vishweswaran K,
You cannot migrate from 1113 Appliances directly, so you need to back-up the data from the appliance, set up a migration machine (windows server for ACS install), install the a supported migrated version. Restore the data to this windows ACS. Migrate from this box to ACS 5 (VM or Appliance). More info: http://tools.cisco.com/squish/cd545
ACS 4.x Elements Supported and un-supported in the Migration Process. Whole list is available for your review:
http://tools.cisco.com/squish/b97f5
Feature Comparison of ACS 3.x and 4.x with ACS 5.3
http://tools.cisco.com/squish/77447
Troubleshooting the Migration utility or process:
http://tools.cisco.com/squish/6C688
Evaluating ACS 5.3 on VMware with trial version:
http://tools.cisco.com/squish/55ce7
You can use a single migration machine for migrating to two ACS boxes.
Base permanent license: 500 devices
Large deployment License: un-limited devices
Regards,
Jatin
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~Jatin