Network Instruments GigaStor 114ff - Manual (Page 26)

Connecting Observer to the GigaStor
Chapter 2 Installing Your GigaStor 26
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By default all of the installed memory on the GigaStor is
dedicated for one probe instance. You must first release the
memory so that you can assign the freed memory to other probe
instances.
4 With the newly renamed probe instance still selected, click
Configure Memory (Figure 12) at the top of the window.
Figure 12 Edit Probe Instance: Capture Buffer Memory
5 Use the arrows to release some memory. Free enough memory to
create your probe instances and click OK. At a minimum each
probe instance requires12 MB memory. It uses 4 MB for statistics
and 8 MB for packet capture. Don’t worry about freeing too
much memory. If you determine you released too much, you can
reallocate it later to the capture buffer or operating system.
Because Observer operates in real-time, its buffers must always
remain in RAM; if the buffers resided in standard Windows user
memory, nothing would prevent the buffer file from being
swapped out to disk and subsequent packet loss. For this reason,
the probe reserves its memory from Windows upon startup so
that no other applications can use it and cause the buffer to be
swapped out to disk.
For more information about buffers, see “Packet capture buffer
and statistics buffer” on page 54.
6 Click the GigaStor Instances tab (Figure 13).