HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 90
Telco Provisioning — Overview of Inter-Site Links, WAN
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Initial backup size in GB Link speed in Mb/sec Backup time at 25 MB/sec in hours Initial. time via WAN in hours (66% efficiency uncontended), compression at 1.5:1, deduplication at 1.5:1, local backups in progress Initial. time via co-location in hours, replication on GbE Ongoing replication time in hours (1% Data change rate) - uncontended link (100% utilization) Limiting factor in replication Ongoing replication time in hours (1% data change rate) - 25% utilization link Limiting factor in replication 500 5.6 14.8 5.0 2.1 2.5 1000 11.1 29.7 9.9 4.3 4.9 100 1.1 1.0 1.0 0.4 D2D appliance 0.4 D2D appliance 500 1000 5.6 5.0 5.0 2.1 2.1 1000 11.1 9.9 9.9 4.3 4.3 * = Unacceptable usage model Depending on the size of the full backup and the link speeds deployed, D2D can deliver the replication in either a 12 hour window (at 100% link utilization) or 24 hour window (with 25% link utilization). Areas marked with an asterisk are outside of these stated usage models. A 1000 Mbit/sec link represents the link speed used when co-locating the devices for initialization. Telco Provisioning - Overview of Inter-Site Links This section provides an overview of how Telcos provide WAN links. With HP D2D device replication the typical parameters required to be specified to the Telco are: • Physical location with respect to a Telco Point of Presence. It is often said that it is the last 100 m of a WAN link where all the cost is incurred. A Point of Presence (PoP) is where the Telco has a connection point to their Core infrastructure. Generally this is housed in the same building as their telephone exchanges. Sometimes laying in the copper or fibre from a Telco's point of presence to your building is where the majority of the installation costs are incurred. The physical location of your office or disaster recovery site will definitely have an effect of the link price. Needless to say if your premises already have a link in place then generally increasing the bandwidth of an existing link is relatively easy. Most Telcos require a business to be within 25 km of a point of presence for Ethernet connections. • Speed required-Most D2D replication implementations will not require links above 50 Mbits/sec. Many will be able to function adequately on speeds as low as 2 Mbit/sec links. 90 D2D Systems