[Moller] [Jlab-scicomp-briefs] Upcoming changes to the JLAB scicomp software systems

[Jie Chen]

Jefferson Lab Scientific Computing Group will introduce a significant 
upgrade to the existing mass storage and batch processing systems in 
early November this year. Beginning in early October, users will notice 
warnings and informational messages about the pending upgrade when they 
execute existing commands. The Scientific Computing group has invested a 
lot of development effort to keep syntax and behavior of user commands 
in the upgraded system similar to those of existing commands even though 
underlying systems have been changed greatly. The following list 
describes the noteworthy changes in the upgraded system:

1. User certificate system.

The current authentication system uses self-signed certificates with 
exceptionally long expiration dates.  In accordance with 
industry-standard practices, and to improve the security of our system, 
new user certificates must be signed by the Jefferson Lab central 
signing authority, and will be valid for two years.

All users will be required to replace their certificates by running a 
command line utility on any centrally managed Linux machine such as 
jlabl1.  The general availability of this tool will be sent out 
initially through email and web postings, followed later by warning 
messages from existing commands.

2. New disk cache and volatile management systems.

The new cache and volatile systems are based on a Lustre global file 
system, which provides better performance and better scalability. The 
volatile system is already in production serving as a global scratch 
disk area with enabled quota and reservation capabilities. The cache 
system will serve as a front end to the tape library. The new cache 
system offers users the ability to explicitly pin cached files. 
Moreover, each file in a DST storage group will be assigned a relatively 
long pin time.  Users can modify the pins, obviating the current 
practice of manually managing DST cache files.

3. Upgraded Jasmine system.

The upgraded back-end system is actually already in production. Some 
notable improvements include: use of MD5 checksums to better ensure data 
integrity, opportunistic direct transfer between network file-systems 
and the tape library to improve throughput and reduce network traffic, 
distributed load-balancing and prioritization to provide fair access to 
the tape library, automatic background duplication of all raw data to 
avoid catastrophic data loss, automated error recovery to improve tape 
library availability, and improved auditing of the systems to provide 
better reporting capabilities.

The user tools have been re-written to deliver more useful information 
during operation as well as on system error.  Please note that the 
output of jput and jget will change significantly.  Consult the 
Scientific Computing wiki if you have scripts that depend upon the 
output of these commands.

4. Upgraded Auger system.

The Auger system has been re-engineered to deliver better utilization of 
the farm nodes, cache disks and the tape library system.  All Auger 
commands retain the current syntax. However, the output of a new Auger 
command will be in XML format.

5. Scientific Computing Web Portal.

A new web portal will be deployed in the same time frame. It will 
utilize modern web technologies such as AJAX and JQuery. It will offer 
the user a better web experience, and will feature more data mining 
capabilities.

This upgrade is aiming to provide users a better experience using 
Jefferson Lab scientific computing facilities in addition to deliver the 
best utilization possible of the facilities. The underlying software has 
been either re-implemented  or completely redesigned using current 
best-practice software techniques to improve reliability, performance 
and maintainability of our whole software system.

More information about this upgrade can be found in the wiki page 
https://wiki.jlab.org/cc/external/wiki/index.php/Scientific_Computing 
under the entries of "Upcoming Software Upgrade". If you have any 
question or suggestion for new features, please feel free to send email 
to scicomp at jlab.org.

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#     Jie Chen                                                 #
#     Scientific Computing Group                               #
#     Jefferson Lab                                            #
#     12000 Jefferson Ave                                      #
#     Newport News, VA 23606                                   #
#     757-269-5046                                             #
#     chen at jlab.org                                            #
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