[Jlab-scicomp-briefs] JLab Data Analysis Cluster Upgrade

[Sandy Philpott]

Jefferson Lab's experimental physics data analysis cluster has recently 
been upgraded with the FY11 Physics farm node procurement.  The new 
systems are all configured with 64-bit CentOS 5.3.

The interactive systems will gain an AMD Opteron 32-core node named 
ifarm11001 ("interactive farm, FY11 system 001") on Monday, March 7.   
The new system is currently available as ifarmltest ("interactive farm, 
linux test"), with 64GB RAM and a 1TB disk including local /scratch.  
This node is being added to the current ifarml64 pool, consisting of 
ifarml1 and ifarml6,  two 8-core hyperthreaded Nehalem systems.

The batch farm is already running 22 additional nodes, farm11001-022. 
These include 18 Nehalem 8-core hyperthreaded systems with 24GB RAM and 
1TB disk, and 4 AMD Opteron 32-core systems with 64GB RAM and 1TB disk, 
for a total of 272 additional cores.  The 32-core AMD systems are being 
configured to run multithreaded jobs, rather than 32+ single core jobs.  
Multithreaded jobs are identified by the cpu: n tag in the job 
submission.  This addition brings the total number of 64-bit cores in 
the farm to just over 700.

With this addition the 32-bit end-of-life Fedora nodes are in the 
process of decommissioning as planned. These include the interactive 
nodes ifarml3, ifarml4, ifarml5, and the last batch of 25 dual core farm 
systems.  ifarml2, an even older system, will also be decommissioned. 
These old nodes will all be shut down on Monday March 14.


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