Offline physics computing
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Simulation Recontruction Batch Data analysis Interative analysis. OffLine Physics Computing. High data volumes (disks, tapes, tape robots) Standard I/O packages Little file sharing Fortran. Applications Characteristics. SHIFT Motivations. Exploit cheap RISC technology spin-off

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Offline physics computing

Simulation

Recontruction

Batch Data analysis

Interative analysis

OffLine PhysicsComputing


Applications characteristics

High data volumes (disks, tapes, tape robots)

Standard I/O packages

Little file sharing

Fortran

ApplicationsCharacteristics


Shift motivations
SHIFT Motivations

  • Exploit cheap RISC technology spin-off

  • Exploit cheap SCSI technology

  • Exploit HOPE success

  • Answer to HEP computing always growing needs


Shift goals

Mainframe quality

Scalable (down & up)

Heterogeneous (open)

Integrated

Minimal (portable) SW development

SHIFT Goals


Shift model
SHIFT Model

CPU

Server

CPU

Server

CPU

Server

CPU

Server

CPU

Server

CPU

Server

Disk

Server

Disk

Server

High Speed Interconnect

Tape

Server

Tape

Server

Tape

Server


Shift software

Pseudo Distributed File System

Tape Access

Batch queues

SHIFT Software


Shift software1

Disk Pool Manager

Remote Tape Copy

Clustered Batch Queues

Remote File I/O

Integration with I/O packages

Unix Tape Control System

Operator Interface

Monitoring

SHIFT Software



Cpu usage
CPU usage

Week 1-42 1992


Shift stage statistics
SHIFT Stagestatistics

Week 1-43 1992

Gigabytes

SUN/STK stage data/drive/week : 48 GB


Tape mount statistics
Tape mountstatistics

Week 1-43 1992

IBM Mounts/Drive/Week 215

SUN/STK Mounts/Drive/Week 253


Conclusions

RISC + SCSI cost effective

CSF style easy to solve

(Remote) I/O is the major problem

Administration is complex

Really scalable

Conclusions


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