Specifications

Troubleshooting Resources 4–33
Using VTDPY to Check for Communication Problems
Use the VTDPY utility to obtain information about the following communications:
■ Communication between the controller and its hosts.
■ Communication between the controller and subsystem devices.
■ State and I/O activity of logical units, devices, and device ports in the subsystem.
■ Monitoring communnication between local and remote controllers in a Data
Replication Manager configuration.
Use the following steps to run VTDPY:
1. Connect a terminal to the controller maintenance port.
NOTE: This terminal must support ANSI control sequences.
2. Set the terminal to NOWRAP mode to prevent the top line of the display from
scrolling off of the screen.
3. Start VTDPY with the following command:
RUN VTDPY
Use the key sequences and commands listed in Table 4–8 to control VTDPY.
Table 4–8 VTDPY Key Sequences and Commands
Command Action
Ctrl/C Enables command mode; after entering Ctrl/C, enter one of the following
commands and press Enter/Return:
CLEAR
DISPLAY CACHE
DISPLAY DEFAULT
DISPLAY DEVICE
DISPLAY HOST
DISPLAY REMOTE (ACS V8.5P only)
DISPLAY STATUS
HELP
INTERVAL
seconds (to change update interval)
Ctrl/G Updates screen
Ctrl/O Pauses (and resumes) screen updates