General sizing considerations
Accurate sizing typically requires a discussion between Riverbed representatives and your server, storage, and application administrators.
General considerations include but are not limited to:
• Storage capacity used by branch offices—How much capacity is currently used, or expected to be used, by the branch office. The total capacity might include the amount of used and free space.
• Input/output operations per second (IOPS)—What are the number and types of drives being used? This value should be determined early so that the product-enabled SteelHead can provide the same or higher level of performance.
• Daily rate of change—How much data is the Edge expected to write back to the storage array through the Core? This value can be determined by studying backup logs.
• Branch applications—Which and how many applications are required to continue running during a WAN outage? This answer can impact disk capacity calculations.