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<== Date ==> <== Thread ==>

Subject: Re: CSS Data Browser Plot Problem
From: John Dobbins <john.dobbins@cornell.edu>
To: "Kasemir, Kay" <kasemirk@ornl.gov>
Cc: Devin Bougie <dab66@cornell.edu>, EPICS Tech Talk <tech-talk@aps.anl.gov>
Date: Fri, 07 Jan 2011 15:57:50 -0500
Kay,

I found the source of the trouble. The PV is question was INVALID in real/current time. When I start the Data Browser it assumes I am interested in the last hour and starts with the time limits (-1 hour, now). It finds the PV in an invalid state. I then go and change the time limits to the past times during which the PV was not in an INVALID state and CSS is still not happy.

I fixed the PV so it is currently valid and every thing works as expected.

Any suggestions for avoiding this in the future?

John





On 1/7/2011 2:45 PM, Kasemir, Kay wrote:
Hi:

On 1/7/11 14:22 , "John Dobbins"<john.dobbins@cornell.edu>  wrote:
We have encountered a case in which CSS Data Browser does not
display a PV correctly. It can export the data (so has certainly
retrieved it from the Archiver).
Yes, but in different ways.

# Created by CSS Data Browser Version 2.0.5.20101112
#
# Start Time : 2010/11/16 20:45:00.000000000
# End Time   : 2010/11/16 20:46:00.000000000
# Source     : Optimized Archived Data
# Desired Value Count: 1000
The export process itself requested ~1000 samples between start&  end time.

The plot uses a desired value count that's configured in the under
preferences CSS/Apps/Trends/Data Browser, by default 800.

Check in the Sample view to see what data the plot actually has to determine
if the problem is in the data that the plot uses, or the plot itself.

If this is for the old Channel Archiver with the XML-RPC network data
server, you can also check the log file of the network data server
(/tmp/archserver.log) to compare
a) What the plot requests&  gets
b) What the export requests&  gets

I assume the reason lies in the way the data is requested, and how that's
handled by the XML-RPC network data server.
What version is your XML-RPC network data server?

Thanks,
Kay


References:
Re: CSS Data Browser Plot Problem Kasemir, Kay

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