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Problem

How Do I Trouble-Shoot onlineSdfits?

• Problem
• Solution
  • Review
  • Who uses onlinesdfits?
  • Is onlinesdfits critical to Observations?
  • How do I know if there's a problem:
  • How do I fix onlinesdfits?:
  • Who do I contact when there's a problem on datacapture I can't fix?:
  • More Information

Solution

Review

There is currently only one processes running on datacapture.

• onlinesdfits - this is in production mode. It creates SDFITS files in /home/sdfits, updating the files at the end of each scan. It is critical to GBTIDL in online mode.

Who uses onlinesdfits?

Who uses onlineSdfits? Only non-pulsar spectral line observors would be ABLE to use onlinesdfits and the SDFITS files it produces. During observations, these users would need onlinesdfits to be working in order to use GBTIDL in 'online' mode. In addition, after observations, the SDFITS files in /home/sdfits would also be of use to these observors.

Is onlinesdfits critical to Observations?

onlinesdfits is a completed software product that should be running at all times. That said, observations may be able to continue if onlinesdfits is not working. For instance, a pulsar observor could care less. Another example is a non-pulsar spectral line observor who is using their own data analysis software to examine their new data. And finally, an observor may decide to continue observing without using GBTIDL in 'online' mode, due to a failure with onlinesdfits.

How do I know if there's a problem:

How do I fix onlinesdfits?:

Usually simply stopping and restarting the onlinesdfits program will get things running again. If this still does not work, contact the appropriate SDD member (see below).

1. Tell the user to exit GBTIDL, and restart the program
2. Tell the user to refrain from using the 'online' command until you've notified them
3. Do a systemstop/systemstart on host datacapture
4. Wait a short period (about a minute) after the current scan ends
5. Inform the user of the following:
   • They may now use the 'online' command
   • They onlinesdfits file will not back fill missing data: it will not fill scans that were run while the onlinesdfits program was offline, these scans will have to be filled manually offline.
   • They can use the 'summary' command to check that this latest scan has been read into GBTIDL.

If these steps do not work, contact the appropriate SDD member (see below).

Who do I contact when there's a problem on datacapture I can't fix?:

Following the SDD callout list, contact PaulMarganian or BobGarwood.

More Information

For software related details, see OnlineSdfitsDesign

- PaulMarganian - 02 Sep 2005