F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 244

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Free space threshold Set the free space threshold of the working
directory. F-Secure Content Scanner Server
sends an alert to the administrator when the
drive has less than the specified amount of
space left.
Performance
Maximum size of data Specify the maximum size (in kilobytes) of data
processed in memory to be transferred to the server via shared
memory in the local interaction mode. When the
amount of data exceeds the specified limit, a
local temporary file will be used for data transfer.
If the option is set to zero (0), all data transfers
via shared memory are disabled.
The setting is ignored if the local interaction
mode is disabled.
Maximum number of Specify how many files F-Secure Content
concurrent Scanner Server should process simultaneously.
transactions
Maximum scan Specify how long a scan task can be carried out
timeout before it is automatically cancelled.