Chapter 11 Backing Up VOBs with MultiSite

This chapter describes two ways to use Rational ClearCase MultiSite as a VOB backup strategy:

• Using a replica as a backup VOB to avoid locking a VOB

• Using multiple replicas to provide incremental backups

Using multiple replicas in a local area network may help with reliability, availability, performance, and backup strategy. However, recovery issues limit how easily and rapidly clients may be switched from one replica to another. The details of the recovery process are described in Restoring and Replacing Replicas.

Using MultiSite for backups means that the backup replica needs to remain online so that it can be updated frequently from the original. Almost twice as much disk space is required (you do not need exactly twice as much space, because derived objects are not replicated and the cleartext pool for the backup replica is smaller or nonexistent). Also, you need a MultiSite license as well as a ClearCase license for each developer who accesses the replicated VOB.