SRA Sizing
Identifying Gateway Key Performance Requirements
Key performance factors are metrics that your technical representative uses as input to an automated sizing tool. The sizing tool calculates the estimated number of Gateway instances your SRA deployment requires.
Identifying these key performance factors and giving them to your technical representative is the first step in formulating your baseline sizing figure.
NOTE Properly sizing the Gateway is difficult, and using the Gateway sizing tool is only the beginning. Gateway performance depends more on throughput then on the number of users, active users, or user sessions. Any sizing information for the Gateway has to be based on a set of assumptions. See “Secure Remote Access Example” on page 152 fore more information.
These are the key performance factors:
•Session Characteristics
•Netlet Usage Characteristics
NOTE After you calculate these key performance factors, give the figures to your technical representative. Ask that the Gateway sizing tool be run to identify the estimated number of Gateway instances.
Session Characteristics
The session characteristics of the Gateway include:
•Total number of SRA (Gateway) users
This represents the size of your user base or pool of potential users for the secure portal. See “Concurrent Sessions” on page 139 for more information on estimating this number.
•Expected percentage of total users using the Gateway (at maximum load) Apply a percentage to your total number of users to determine this figure.
•Average time between page hits
This is how often on average a user requests a page from the portal server.
Chapter 4
