4-6
User Guide for the Cisco Network Analysis Module (NAM) Traffic Analyzer, 5.0
OL-22617-01
Chapter 4 Capturing and Decoding Packet Data
Sessions
Table 4-4 lists the hardware platforms NAM 5.0supports and their maximum session size. This is the
maximum capture memory buffer size for all capture sessions together, not individually.
Storage Type:
Memory
Check to store captures in
memory
Enter values for Memory Size for this capture. Enter a number from
1 up to your platform maximum. If system memory is low, the actual
session size allocated might be less than the number specified here.
See Table 4-4 for maximum session sizes for each NAM platform.
The NAM Traffic Analyzer will grant less memory than requested if
the available memory is less than requested.
Check (if desired) Wrap when Full to enable continuous capture
(when the session is full, older packet data is removed to make room
for new incoming packets). If you do not check Wrap when Full, the
capture will end when the amount of data reaches size of session.
Storage Type: File(s) File Size (MB) Enter a value for File Size (file size can be from 1 to 2 GB or up to 10
GB for the NAM appliances). About 400MB of free disk space is
reserved for working files. If available disk space is below 400 MB,
you will not be able to start new capture-to-disk sessions. See
Table 4-4, Maximum Capture Session Sizes for NAM Platforms.
Number of Files Enter a value for Number Of Files to use for continuous capture.
Rotate Files Check the Rotate Files check box to rotate files in continuous capture.
Available only for remote storage or NAM 2200 Series appliances.
See section Capture Data Storage, page 2-18, for information about
configuring remote storage.
The Rotate Files option can only be used with remote storage or the
NAM 2200 Series appliance’s local disk. See the section Capture
Data Storage, page 2-18, for information about configuring remote
storage.
If you choose the Rotate Files option, when you reach the highest
number file, the earliest file is overwritten. For example, if you
specify No. Files to 10, file CaptureA_1 is overwritten after the
NAM writes capture data to file CaptureA_10. To determine the most
recent capture, check each file’s time stamp.
File Location Choose a location from File Location. Local disk is the default, or
choose a previously configured remote storage location. You can add
(NFS and iSCSI) remote storage locations by going to
Administration > System > Capture Data Storage.
Table 4-3 Capture Settings Fields (continued)
Field Description Usage Notes
Tab l e 4-4 Maximum Capture Session Sizes for NAM Platforms
NAM Platform
Maximum Session
Size
WS-SVC-NAM-1 125 MB
WS-SVC-NAM-1 with memory upgrade (MEM-C6KNAM-2GB) 500 MB
WS-SVC-NAM-1-250S 200 MB