Attendees: Alessandra, Bob, Horst, Xin, Saul, Wei

ADC CentOS 7 readiness page:

https://twiki.cern.ch/twiki/bin/view/AtlasComputing/CentOS7Readiness

Suggest that each site setup a dedicated s-core Panda Queue XXX_SL7 to test their setup.

Sites will have two options: Run directly on CentOS7 host, or via Singularity.

For sites that wants to run Singularity, there are also two options:

1. Encapsulate job payload in Singularity image (by batch), can use either Singularity 2.2.1 or 2.3.x. BNL, MWT2 and NET2 prefers this approach 
2. Have pilot starts Singularity as needed (https://twiki.cern.ch/twiki/bin/viewauth/AtlasComputing/ContainersInUScloud). Should use Singularity 2.2.1 for now, which is the common denominator. AGLT2 and OU will take this route. 

ADC is OK with both approach, and prefer 2.

Time frame to start deploying CentOS7 on batch nodes:

• BNL: looking at the end of September
• AGLT2: Sep/Oct
• MWT2:
• NET2: using old version of GPFS. No license for new GPFS that is required to run on CentOS7. Looking at either buy license or switch to CEPH based storage. Both take long time.
• SWT2-OU: Done 12 months ago.
• SWT2-UTA:
• SLAC: unknown. Switching to CentOS7 is tired to switching of unix configuration management system (toward CHEF).

Will create a twiki to help US sites to exchange info, with a link point to the ADC twiki (above)