You can have Access Gateway roll over log files based on time or on size, but not both. If you already know which option you want to use, scan this section and then complete only the calculations pertinent to your choice. If you don’t know which option best matches your situation, completing the calculations in this section should help you decide.
The following variables are used in the formulas:
logpartition_size: The total disk capacity reserved for log files on Access Gateway.
Access Gateway reserves 4 GB to share between logging and system files. The system files do not grow significantly, so you can assume that you have about 2 GB for logging. To increase this size, see Configuring the Size of the Log Partition.
logentry_size: The average log entry size.
You can determine this by configuring a proxy service to track the required information, generating traffic to the proxy service, downloading the log files, determining how large each entry is, and calculating the average.
request_rate: The peak rate of requests per second.
You can estimate this rate or place your Access Gateway in service and get more accurate data by accessing generated statistics. See Monitoring Access Gateway Statistics.
num_services: The number of proxy services for which you plan to enable logging.
logs_per_service: The number of log files, both active and closed, that you want Access Gateway to generate for each proxy service before the disk fills.
You must plan to have at least two logs per proxy service, but you can have more.
The following formulas can help you estimate when the system would run out of resources: