proposal for a dedicated lhcb linux / pc batch facility at cern

June 3, 1999 LHCb Software Week 1

Proposal for a dedicated LHCb Linux / PC batch facility at CERN

Catherine Charbonnier

Tony Cass

CERN - IT/PDP

2LHCb Software WeekJune 3, 1999

Why a Linux / PC facility? LHCb use AIX services Current problems

– lack of C++ compiler that• supports the latest language constructs AND

• is compatible with CLHEP as provided by IT/ASD

– lack of support for AIX• GNU products

• ROOT

3LHCb Software WeekJune 3, 1999

Why a Linux / PC facility?

Growth of PC systems – at CERN – everywhere!

O.S. is Windows NT or Linux Linux could match very easily with LHCb

requirements– Set up a dedicated PC cluster running Linux

4LHCb Software WeekJune 3, 1999

The proposed platform

rsplus rsbatch

Now

Will be

lxtest shiftlhcb

Lhcb

Lhcb

5LHCb Software WeekJune 3, 1999

Details of the implementation

Hardware (see Fig.)– lxtest cluster = 3 Dual Pentium II PCs– shiftlhcb cluster = 4 Dual Pentium II

PCs, 450MHz per processor

800 CU = Twice the rsbatch allocation to LHCb (2,000,000CUh/year 4/32 nodes)

– Fast-Ethernet connections

6LHCb Software WeekJune 3, 1999

Details of the implementation

Software– CERN certified version of Linux

• RedHat 5.1 (will be upgraded to RedHat 6.0)• Kernel 2.2.6 (best kernel for SMP systems)• LSF batch system• AFS / SUE environment

– environment identical to rsbatch– g77/gcc instead of xlf/xlc

2x10GBUATA

2xPII@450MHz,128MB

2x10GBUATA

2xPII@450MHz,128MB

2x10GBUATA

2xPII@450MHz,128MB

2x10GBUATA

2xPII@450MHz,128MBHP Kayak XAs

3COM 3900 switch

shiftlhcb

3COM 3900 switch

2x10GBUATA

2xPII@450MHz,128MB

2x10GBUATA

2xPII@450MHz,128MB

2x2GBUATA

2xPII@300MHz,256MB

lxtest

Lhcb

CORE Ethernetnetwork

Site Ethernetnetwork shift18

475GBSCSI

8LHCb Software WeekJune 3, 1999

Future lxtest cluster is available:

– iss name lxtest • telnet• xdm

shiftlhcb cluster: – PCs ordered – should be available by end of July 1999.

Further expansion will be discussed during COCOTIME round.

9LHCb Software WeekJune 3, 1999

Please contact– IT/LHCb linkman

tony.cass@cern.ch– Service Manager for shiftlhcb cluster

catherine.charbonnier@cern.ch– Service Manager for lxtest cluster

pietro.martucci@cern.ch

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