Preparing for the migration

Within a migration, all data is kept in place; however, we strongly recommend to take a Cassandra backup before you start the migration. If database data is corrupted during a migration, you can use the Cassandra backup, also known as a snapshot, to restore data instead of repeating initial installation of Web Services and Applications.

Instructions for how to take a backup depends on which Cassandra version is in use. Choose one of the following procedures and use the sipfs keyspace for this operation:

• Taking a snapshot of Cassandra 1.2 data
• Taking a snapshot of Cassandra 2.2 data