Endace DAG 5.2X, User Manual

Page: 35 / 66

EDM01-33v1 DAG_7.5G4_Card_User_Guide
©2008 Endace Technology Ltd. Confidential - Version 1 - November 2008 31
Using your DAG card to capture data
Introduction
This chapter describes how to complete the following operations for a DAG card:
•
Basic data capture 31 (page )
• Viewing captured data 34 (page )
• Converting captured data 36 (page )
•
Using third party applications 38 (page )
•
Transmitting captured data 38 (page )
Basic data capture
dagsnap
is a software utility used to write to disk the raw data captured from a DAG card.
Data is collected in Extensible Record Format (ERF) which can then be viewed using
dagbits
,
or converted to other formats using
dagconvert
.
When capturing high speed data Endace recommends you use
dagsnap
, see Capturing data at
high speed 33 (page ).
For further information on the software utilities see:
• dagsnap 32 (page )
• dagbits 34 (page )
• dagconvert 37 (page )
Starting a capture session
To start the capture session type the following at the prompt:
dagsnap -d0 –v -o tracefile
(where "0" is the device number of the DAG card you wish to capture data from)
Note: You can use the
-v
option to provide user information during a capture session
although you may want to omit it for automated trace runs.
By default,
dagsnap
runs indefinitely. To stop, use CTRL+C . You can also configure
dagsnap
to run for a fixed time period then exit.