To ensure that the initial replication is successful, determine
whether you have the network bandwidth, processor availability, and
the time for replication. Estimating network bandwidth is based on
the amount of data that must be replicated.
Procedure
- To calculate the required network bandwidth, determine
the following information:
- Total amount of data (TD) to be replicated, in gigabytes. To calculate
the total amount of data, see Estimating the total amount of data to be replicated.
- Length of replication window time (RWT) in hours. The length of
the replication window time is the time that you schedule during server
maintenance for replication to occur.
- Data deduplication ratio (DR), if you are using the data deduplication
function. Issue the QUERY STGPOOL command and use
the FORMAT=DETAIL value of to determine the data deduplication ratio
value. If you are not using the data deduplication function, use 100
as the data deduplication ratio value.
- Calculate the bandwidth required by using the following
formula:
(TD * (100 / DR) * 8192) / (RWT
* 3600) = Required_Network_Bandwidth (Mbps/second)
What to do next
If the value for required network bandwidth exceeds the capabilities
of your network, you must adjust the values in the formula. Reduce
the TD value or increase the replication time, to reduce the value
for
Required_Network_Bandwidth. If you cannot adjust
the TD or the RWT time values, adjust or replace your existing network
to reduce the additional workload.