Estimating the total amount of data to be replicated

Determine the amount of data that is replicated initially and incrementally daily. Initial replications typically take longer to complete than incremental daily replications.

1. Estimate the initial amount of data to be replicated. Decide which nodes, file spaces, and data types must be replicated. To calculate the total amount of physical space that is occupied for each file space and data type that must be replicated, issue the QUERY OCCUPANCY command for each node. For example, you can display information about the file spaces assigned to the node named PAYROLL by issuing the following command:

   query occupancy payroll

   Tip: Tune the performance of replication to the data type. For example, if you do not plan to replicate a data type in a file space, exclude the number of files for that data type.
2. Determine the amount of data that is backed up daily by the client nodes. Complete the following steps to estimate the amount of data that is replicated incrementally daily:
   1. When client nodes complete a store operation, the client logs completion messages with the server. The completion messages report statistics or information for a client operation that was transferred to the server. Message ANE4961I shows the number of bytes that are transferred during a client operation.
   2. To determine the average amount of bytes that are backed up daily by a particular node, add the number of bytes that are shown in the ANE4961I messages over several days. Then calculate the average amount of bytes to be replicated for all nodes to determine how much data is replicated daily.