Novell ACCESS MANAGER 3.1 SP2 - ACCESS GATEWAY GUIDE 2010 Manual page 133

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
page 140.
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 the 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:
"Calculating diskfull_time" on page 133
"Calculating max_roll_time" on page 134
"Calculating max_log_roll_size" on page 134
Calculating diskfull_time
Use the following formula to calculate how long it takes the Access Gateway to fill your logging
disk space:
diskfull_time in seconds = logpartition_size / (request_rate *
logentry_size * num_services)
For example, assume the following:
logpartition_size = 1 GB (1,073,741,824 bytes)
request_rate = 1000 requests per second
logentry_size = 1 KB (1,024 bytes)
num_services = 1
diskfull_time = (1 GB) / (1000 * 1 KB * 1) = 1048 seconds (17.47
minutes)
The logging disk space fills up every 17.47 minutes.
To calculate the diskfull_time for your Access Gateway:
1 Determine the values of the four variables listed above.
2 Use the diskfull_time formula to calculate how often you can expect your logging disk to fill,
then use the result in
If your diskfull_time interval is too short to be practical for your rollover schedule, the easiest option
is to reduce the log entry size by configuring the proxy services to log less information per
transaction.
Section 4.4, "Viewing Access Gateway Statistics," on
Calculating max_roll_time.
Access Gateway Maintenance 133