You can manage the maximum number of sessions that are
used for sending data to the target replication server to improve
replication performance.
About this task
Use the MAXSESSIONS parameter to
specify the maximum number of sessions to use. When you calculate
the value for the MAXSESSIONS parameter, consider
the available network bandwidth and the processor capacity of source
and target replication servers.
Consider the number of logical
and physical drives that can be dedicated to the replication process.
You must ensure that there are enough drives available for replication
processing because other server processes or client sessions might
also be using drives. The number of mount points and drives available
for replication operations depends on the following factors:
- Tivoli® Storage
Manager server
activity that is not related to replication
- System activity
- The mount limits of the device classes for the sequential-access
storage pools that are involved
- The availability of a physical drive on the source and target
replication servers, if the device type is not FILE
- The available network bandwidth and the processor capacity of
source and target replication servers
Procedure
Issue the REPLICATE NODE command and
specify the MAXSESSIONS parameter to determine
the number of data sessions. For example, to set the
maximum number of replication sessions to 6 for NODE_GROUP1, issue
the following command:
replicate node node_group1 maxsessions=6
Restriction: The following values apply to the
MAXSESSIONS parameter:
- The value that is specified by the MAXSESSIONS parameter
applies only to data sessions. Data sessions are sessions during which
data is sent to a target replication server. If you issue a QUERY
SESSION command, the total number of sessions might exceed
the number of data sessions. The difference can occur if you use short
control sessions that you use to query and set up replication operations.
- The value of the MAXSESSIONS parameter represents
the maximum allowable number of sessions. The number of sessions that
are used for replication depends on the amount of data to be replicated.
If you are replicating only a small amount of data, there is no advantage
to increasing the number of sessions.