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[RFC 004] Operation Review Comment 7
Organization: SCCWRP
Review of DAP2 operational experience:
NASA's Earth Science Data Systems Standards Process Group (SPG) is considering the Data Access Protocol, Version 2, (DAP2) for adoption as a community standard. This is the second review of DAP2, this one focusing on its operation experience.� The questions below are provided to guide your feedback. You only need to answer questions applicable to you.
- Describe in a sentence or two your overall operational experience related to DAP2 (e.g., scientific analysis; science users, server operation; database management; or data translation, etc).� What kinds of DAP2 systems do you have experience with?� (e.g., OPeNDAP netCDF server, OPeNDAP HDF server, OPeNDAP Matlab Toolkit, Ferret, GrADS, and etc).
We use OPeNDAP to serve physical oceanographic measurements collected with CTD instruments.�� We use an OPeNDAP server version called TOMCAT.� TOMCAT is specifically designed to use with SQL databases.� We have had the server running for approximately a year now and have had no problems at all.
The system was easy to set up, even on multiple platforms.� We have installed it on Linux based machines and Windows based machines and it worked perfectly on both platforms.�
The support we have received from the OPeNDAP community has been outstanding in every way.�
We chose this technology because it already had a reputation for working well and we did not feel we had to re-invent the wheel for our project.� OPeNDAP was a logical choice for our distributed database system.
Our user community is small, so band width has not yet become a problem for us.
We have not kept logs on the system usage.
- How long have you been using DAP2 operationally?
- What types of applications do you use DAP2 systems for?� Are the DAP2 systems applicable to your applications? (e.g., Do they work well with the data types and data manipulations in your application?)��
- How many of your applications use DAP2?
i. Total number of applications
ii. Percentage of applications
- Why do you choose to use DAP2 systems over other systems for your applications?
- What alternative technologies did you consider?
- Are the DAP2 systems easy to use?� (e.g., Is it hard to learn how to use DAP2 systems?)
- Does the performance of the DAP2 systems you have experienced meet your requirements?� (e.g., Does it take a long time to access data in DAP2 systems?)
- Have your bandwidth issues changed since you have been using DAP2 systems? (e.g., Have you seen increased bandwidth requirements because of increased data access or DAP2 overhead, decreased bandwidth requirements because of reduced data volume from subsetting, no impact on bandwidth because of low usage?)
- What operational challenges do the DAP2 systems present? (e.g., Does it require advanced processing power, large amounts of memory, complex configuration, etc.? Are the systems easy to deploy and maintain?)
- How has the use of DAP2 affected your systems administration workload?
- How well do the DAP2 systems scale to large numbers of simultaneous users, or to large datasets?
- How much data does your DAP2 system handle in a typical month?
i. Total data volume
ii. Total number of data files
iii. Percentage of data volume
iv. Percentage of data files
- Can you provide information on user statistics of your DAP2 systems?�
- How many users does your DAP2 system handle in a typical month?
i. Total number of DAP2 users
ii. Percentage of your overall users
- Of the feedback you have received from your users on DAP2, what percentage is positive and what is negative?
- How have the user statistics changed over time?
