HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 182
Link Sizing, Basic Calculations, Aggregate Mbytes/sec, Network Latency, Job Concurrency Required
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Job Concurrency Required to Network Latency Saturate Link 4 50ms 4 100ms 7 200ms 7 500ms Aggregate Mbytes/sec 80 MB/sec 80 MB/sec 80 MB/sec 52 MB/sec When you set the global per job Mbytes/sec limit on the target device, you can calculate the Mbytes/sec limit on each replication target by multiplying the per job limit by the maximum number of concurrent jobs set for that replication target. This is only the Mbytes/sec limit but it will only apply if the replication link bandwidth is higher than this limit. Link Sizing This section focuses on understanding how to size the replication link bandwidth required. The size of the replication link will depend on your usage model for replication. NOTE: For the volumes of data to replicate with HP VLS systems, HP recommends a dedicated replication link wherever possible. • Backup and replication can take place in a fixed window (up to 12 hours) preferably when the WAN link is not heavily used by applications (that is outside business hours). The replication process has almost the full bandwidth of the WAN link available to it. Within the HP VLS System configuration for replication you can set a "replication start time and window" during which time replication is allowed to operate. • The business runs 24x7 and there are no fixed windows in which to do replication. In this example the replication can be "limited" and the HP VLS devices can be configured to only use a percentage of the available bandwidth so as not to adversely affect application performance if applications are sharing the same WAN link. • The most likely scenario for enterprise data centers using HP VLS replication is that it will be enabled to run 24 hours a day on dedicated links used only for replication. HP VLS has the ability to enable windows for replication to further customize the implementation to best suit your needs. • With HP Accelerated deduplication there is a time delay after the backup completes for the deduplication to run and the replication instructions to be generated before new data can replicate. This means there is probably a stronger need for a dedicated link and the full utilization of that link in order to get the backup deduplication and replication completed within an acceptable service level agreement. HP also provides at Backup Sizing Tool to help you size any backup solution including deduplication and replication. See http://www.hp.com/go/storageworks/sizer. Wherever possible, do a proof of concept before implementing into production. Basic Calculations The time required for replication is derived from the equation: 182 Virtual Library Systems