HP SVA V2.1 System Administration Guide

Table A-1 Troubleshooting (continued)

RemarkProblem

This could be a problem with your display devices. If you

are using a video switch between your display nodes and

display devices, try hooking your display devices directly

to the display nodes.

Another possibility may appear using the

sva_chromium_dmx.sh script. Depending on the

display hardware on your cluster, use of the

sva_chromium_dmx.sh script in non-interactive mode

may not start all the tiles in a multi-tile display with the

correct resolutions. Normally, all tiles should share the

same resolution as determined by the Display Surface

default resolution. This problem is more likely to appear

in displays that use analog video connections.

After you begin a job using the sva_chromium_dmx.sh

script, DMX indicates that it is starting by means of a

message in the upper-left corner tile of a multi-tile display.

The remaining tiles are black until the visualization

application starts. You may have the problem if the

application starts with an image that appears incorrectly

offset in the upper-left tile when compared to the

remaining tiles in the display. This may be because the

tiles are using different resolutions.

You can verify the resolutions on the individual tiles by

running the following command from the head node for

each display node cabled to its respective display tile:

% xwininfo -root -display n1:0

Substitute each display node used to drive the tiles in

your display for n1.

There is a Site Configuration File tag that fixes this

problem. It is the SVA_FILL_DISPLAYS_ON_STARTUP

tag in the SVA_CLUSTER section of the Site Configuration

File. Set the value of this tag to “yes” in the Site

Configuration File. This requires root privileges.

From any cluster node, enter the following command:

# svaputdata SVA_CLUSTER

SVA_FILL_DISPLAYS_ON_STARTUP yes

If the problem persists, contact HP Technical Support.

Sub-portions of an image (individual tiles) are different

sizes relative to one another on a multi-tile display.

56 Troubleshooting