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Use the Scan Memory tab to set the size of memory, which ScanMail tasks allocate to scan files in memory.
Use the following guidelines as a starting point to determine the appropriate memory for memory-based scanning:
  • Dedicate the amount of memory that is adequate for most messages and document attachments in your environment.
    If you find that 90% of attachments in your organization are below 2 MB, you can allocate only 2 MB to each memory-based scanning task. Do not use the average message size for this sizing as you will not get optimal results.
  • If your organization is limiting the maximum attachment size, you can use this value.
  • Compressed files must be decompressed before scanning.
    Dedicate an appropriate amount of memory for the decompressed files, not the compressed attachments.
  • Consider the total amount of memory that will be used by all ScanMail tasks on the Domino server.
    For example, if you are running three SMDreal tasks with 5 MB dedicated memory, ScanMail is using 15 MB of memory. At the time of scheduled scans (SMDdbs), you must also add this memory to the total amount.
  • Check the size and utilization of memory on the Domino server (refer to the Domino documentation for more information on how to determine memory utilization.
    In memory starved environments, the negative impact of dedicating memory for ScanMail will be far greater than the performance improvement of memory-based scanning.
For most organizations, the default value of 5 MB for each ScanMail task is suitable.
To set scan memory size:
  1. Create or modify a server settings rule (see Creating a Server Setting Rule) or (Modifying a Server Settings Rule).
  2. From the working area, click the Scan Memory tab.
  3. For each scan type, type an integer that corresponds to the memory size in megabytes (MB).
  4. Click Save & Close.