CMS Requirements for CVMFS, Frontier and Xrootd

Here is a list of CMS requirements/recommendations for the services to be deployed by the end of this year (2012).

This is not an official CMS document. I'm trying to summurize for my own purposes all the information that I could find so far.

CVMFS

CMS recommendations for the CVMFS deployment

https://twiki.cern.ch/twiki/bin/view/CMSPublic/CernVMFS4cms

Worker node

"Present recommendation is to put the cache on a separate partition and make the cache at least 6GB large."

https://hypernews.cern.ch/HyperNews/CMS/get/t2/834/2/1/1.html

Squid cache server

"CVMFS tends to put a very light load on a squid, much lighter than Frontier."

https://hypernews.cern.ch/HyperNews/CMS/get/t2/834/2.html

Frontier

Installing Frontier Local Squid Cache Server

https://twiki.cern.ch/twiki/bin/view/CMS/SquidForCMS

"For most purposes 2GHZ, 2GB, 100 GB should be adequate." (how many cores?)

"Sites with over 500 job slots should have at least 2 squids for reliability."

Xrootd

CMS Xrootd Architecture

https://twiki.cern.ch/twiki/bin/view/Main/CmsXrootdArchitecture

Xrootd proxy server

???

NAT that connects worker nodes to internet

???

-- PavelDemin - 14-Sep-2012