Whenever a Rational ClearCase release introduces features that require support in the VOB database, you must raise the feature level of a VOB before clients can use the new features when accessing data in that VOB. The primary purpose of feature levels is to help manage Rational ClearCase release upgrades when VOBs are replicated (with Rational ClearCase MultiSite®) to server hosts that run different Rational ClearCase releases.
Every Rational ClearCase release is associated with a feature level. For information on the feature levels that this release supports, see the IBM Rational ClearCase and ClearCase MultiSite Release Notes.