Scheduling Bandwidth Usage - HP P4000 SAN Technical White Paper

Best practices for IP networking
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Scheduling bandwidth usage

The size and frequency of the remote copy snapshots are the two main factors affecting the amount of bandwidth
needed for an implementation. You can determine the sizes of your snapshots by using the management console and
following these steps:
1. Set up a local snapshot schedule with the frequency you plan to use, and let this run for a couple of days.
2. Highlight the cluster in the management console and click on the Disk Usage tab in the tab pane.
3. Monitor the sizes of the snapshots, and use this size to calculate the amount of bandwidth required.
Once you have characterized the amount of change in your volumes over time, you can determine if the amount of
available bandwidth is adequate to keep up with the snapshot frequency.
Figure 3 depicts the creation of a remote volume. Understanding the sizes of the snapshots that are created and
transferred is the key to a successful remote copy implementation.
Figure 3: Example of an IP network configuration for P4000 remote copy, using VPN gateways to route TCP and UDP traffic
between the two private networks.
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Use a VPN client on a remote host running the management console to manage remote copy tasks. Tasks may also
be managed from either Private LAN.
Use private line point-to-point or VPN connections for your remote copy implementations.
If using existing VPN solutions, dedicate an interface on each end of the VPN for storage traffic.