HCP System Management Help


Scheduling activity on a replication link

The amount of send activity that can occur on a replication link at any given time is controlled by the performance level that applies to the sending system. An active/active link has two performance levels at any given time, one for each system involved in the link. An active/passive link has only one performance level at any given time. That level applies to the primary system during replication and to the replica during data recovery.

The performance levels for different replication links are independent of each other, as are the performance levels for the two systems involved in an active/active link. In each case, the performance level can be low, medium, high, custom, or off. Off means that no send activity is occurring for the applicable link on the applicable system.

For each system involved in an active/active link and for an active/passive link, you can schedule the performance level to change automatically over the course of a week. At any time, if you don’t want to use the schedule, you can override it by selecting a single performance level to apply until you cancel the override.

Overriding a replication schedule lets you change the performance level without changing the configured schedule. You might do this, for example, on a holiday when the load on the applicable HCP system is expected to be light.

Note: When data recovery begins on an active/passive link, a schedule override with a performance level of high takes effect. When data recovery is complete, the performance level automatically returns to the currently scheduled level if the schedule was in effect when data recovery began or to the override level that was in effect when data recovery began, as applicable.

The performance level for a sending system determines the amount of load replication or recovery processing puts on that system and on the network connecting that system to the other system involved in the applicable replication link. If a system is sending data on multiple links, the total load on the system is determined by the performance levels for all of those links together. To minimize the load, you should schedule the links to be active at different times.

Tip: If the system load from other activities is light, consider raising the performance level for one or more links to reduce any replication backlog. If the system load is heavy, consider lowering the performance level for one or more links to free resources for other system activity.

For more detailed information on performance levels, see Changing the custom performance level.

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