Endace DAG 5.2X, User Manual

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EDM01-33v1 DAG_7.5G4_Card_User_Guide
32 ©2008 Endace Technology Ltd. Confidential - Version 1 - November 2008
dagsnap
dagsnap
is a data capture software utility.
The following is a list of the options available in
dagsnap
.
Option Description
-d DEVICE
--device DEVICE
Use the DAG device referred to by DEVICE. Supported syntax includes
0, dag1, and /dev/dag3 to refer to DAG cards, and 0:2, dag1:0, and
/dev/dag2:0 to refer to specific streams on cards.
-h, -?
--help, --usage
Display usage (help) information.
-j
Maximize disk writing performance by only writing data to disk in
chunks. This option may not be available on all operating systems.
-m NUM
Write at most NUM megabytes of data per call to the DAG API (default
is 4 MiB).
-o FILE
--fname FILE
Write the captured packets to FILE, in ERF format (default is standard
output).
-s NUM
--runtime NUM
Run for NUM seconds, then exit.
-v
--verbose
Increase output verbosity. When
dagsnap
is run with this command
three columns of data are reported every second. These columns
contain
1. The cumulative total of data written out from the DAG card.
2. The buffer occupancy. Small values indicate no packet loss.
3. The rate at which data is currently being written.
-V, --version
Display version information.
-w,--wait SEC
Delay(wait) in seconds before capture and after.