HP StoreOnce 4430 HP StoreOnce Backup System Concepts and Configuration Guidel - Page 87
Replication blackout windows, Replication bandwidth limiting
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Replication blackout windows The replication process can be delayed from running using blackout windows that may be configured using the StoreOnce GUI. Up to two separate windows per day, which are at different times for each day of the week, may be configured. The best practice is to set a blackout window throughout the backup window so that replication does not interfere with backup operations. If tape copy operations are also scheduled, a blackout window for replication should also cover this time. Care must be taken, however, to ensure that enough time is left for replication to complete. If it is not, some items will never be synchronized between source and target and the StoreOnce Backup system will start to issue warnings about these items. The replication blackout window settings can be found on the StoreOnce Management Interface on the HP StoreOnce - Replication - Local Settings - Blackout Windows page. Figure 44 Configuring replication blackout windows Replication bandwidth limiting In addition to replication blackout windows, the user can also define replication bandwidth limiting; this ensures that StoreOnce replication does not swamp the WAN with traffic, if it runs during the normal working day. This enables blackout windows to be set to cover the backup window over the night time period but also allow replication to run during the day without impacting normal business operation. Bandwidth limiting is configured by defining the speed of the WAN link between the replication source and target, then specifying a maximum percentage of that link that may be used. Again, however, care must be taken to ensure that enough bandwidth is made available to replication to ensure that at least the minimum (2 Mb/s per job) speed is available and more, depending on the amount of data to be transferred, in the required time. Replication bandwidth limiting is applied to all outbound (source) replication jobs from an appliance; the bandwidth limit set is the maximum bandwidth that the StoreOnce Backup system can use for replication across all replication jobs. The replication bandwidth limiting settings can be found on the StoreOnce Management Interface on the HP StoreOnce - Replication - Local Settings - Bandwidth Limiting page. There are two ways in which replication bandwidth limits can be applied: • General Bandwidth limit - this applies when no other limit windows are in place. • Bandwidth limiting windows - these can apply different bandwidth limits for times of the day A bandwidth limit calculator is supplied to assist with defining suitable limits. Controlling Replication 87