The GRID and the Linux The GRID and the Linux Farm at the RCFFarm at the RCF

CHEP 2003 – San DiegoCHEP 2003 – San Diego

March 27, 2003March 27, 2003

A. Chan, R. Hogue, C. Hollowell, O. Rind,A. Chan, R. Hogue, C. Hollowell, O. Rind,

J. Smith, T. Throwe, T. Wlodek, D. YuJ. Smith, T. Throwe, T. Wlodek, D. Yu

RHIC Computing FacilityRHIC Computing Facility

Brookhaven National LaboratoryBrookhaven National Laboratory

OutlineOutline

• BackgroundBackground• HardwareHardware• SoftwareSoftware• SecuritySecurity• GRID-like capabilitiesGRID-like capabilities• Near-term plansNear-term plans

BackgroundBackground

• Used for mass processing of RHIC dataUsed for mass processing of RHIC data

• U.S. tier 1 Center for ATLASU.S. tier 1 Center for ATLAS

• Listed as 3Listed as 3rdrd largest cluster in largest cluster in http://clusters.top500.orghttp://clusters.top500.org

• Currently staffed with 5 FTECurrently staffed with 5 FTE

Growth of the Linux FarmGrowth of the Linux Farm

0

200

400

600

800

1000

1999 2000 2001 2002 2003

K SpecInt2000

HardwareHardware

• Built with commercially available Intel-based Built with commercially available Intel-based serversservers

• 1097 rack-mounted, dual CPU servers1097 rack-mounted, dual CPU servers

• 917,728 SpecInt2000917,728 SpecInt2000

• Reliable (0.0052 hardware failure/machine-Reliable (0.0052 hardware failure/machine-month—about 6 failures/month)month—about 6 failures/month)

Breakdown of Hardware FailuresBreakdown of Hardware Failures

31%

26%13%

11%

19%DISK

PS

MB

MEM

OTH

The Linux The Linux FarmFarm in the RCF in the RCF

The IBM serversThe IBM servers

The VA Linux serversThe VA Linux servers

Hardware (cont.)Hardware (cont.)

BrandBrand CPUCPU RAMRAM StorageStorage QuantityQuantity

VA LinuxVA Linux 450 MHz450 MHz 0.5-1 GB0.5-1 GB 9-120 GB9-120 GB 154154

VA LinuxVA Linux 700 MHz700 MHz 0.5 GB0.5 GB 9-36 GB9-36 GB 4848

VA LinuxVA Linux 800 MHz800 MHz 0.5-1 GB0.5-1 GB 18-480 GB18-480 GB 168168

IBMIBM 1.0 GHz1.0 GHz 0.5-1 GB0.5-1 GB 18-144 GB18-144 GB 315315

IBMIBM 1.4 GHz1.4 GHz 1 GB1 GB 36-144 GB36-144 GB 160160

IBMIBM 2.4 GHz2.4 GHz 1 GB1 GB 240 GB240 GB 252252

SoftwareSoftware

• Custom version of Red Hat Linux 7.2Custom version of Red Hat Linux 7.2

• Linux image installed with KickstartLinux image installed with Kickstart

• Support for an array of compilers (gcc, PGI, Support for an array of compilers (gcc, PGI, Intel) and debuggers (gdb, TotalView, Intel)Intel) and debuggers (gdb, TotalView, Intel)

• Support for network file systems (AFS, NFS)Support for network file systems (AFS, NFS)

Software (cont.)Software (cont.)

• Support for LSF and MDS-compatible batch Support for LSF and MDS-compatible batch softwaresoftware

• Mix of open-source, RCF-built and vendor-Mix of open-source, RCF-built and vendor-supplied system to monitor and control supplied system to monitor and control hardware, software and infrastructurehardware, software and infrastructure

• Cluster management tools based on open-Cluster management tools based on open-source softwaresource software

Linux Farm MonitoringLinux Farm Monitoring

Batch Control & MonitoringBatch Control & Monitoring

Linux Farm UsageLinux Farm Usage

Remote Power Management Remote Power Management

Infrastructure MonitoringInfrastructure Monitoring

SecuritySecurity

• Firewall to minimize unauthorized accessFirewall to minimize unauthorized access

• User access via SSH through security-enhanced User access via SSH through security-enhanced gateway systemsgateway systems

• Most servers closed to direct external accessMost servers closed to direct external access

• Other security measures being developedOther security measures being developed

Security (cont.)Security (cont.)

GRID-like capabilitiesGRID-like capabilities

• Ganglia (monitoring & job scheduler)Ganglia (monitoring & job scheduler)

• Condor (batch software)Condor (batch software)

• GLOBUS & LSF batchGLOBUS & LSF batch

GangliaGanglia

• Open-sourceOpen-source monitoringmonitoring software software (http://sourceforge.net/projects/ganglia)(http://sourceforge.net/projects/ganglia)

• Can create federation of clustersCan create federation of clusters

• Historical data informationHistorical data information

• Can be used as job scheduler in GRID-like Can be used as job scheduler in GRID-like environmentenvironment

Ganglia (cont.)Ganglia (cont.)

• Web interfaceWeb interface

• Prototype at the RCFPrototype at the RCF

• Scalability issuesScalability issues

• Downside – cannot (yet) restrict data access Downside – cannot (yet) restrict data access easily, not easily customizedeasily, not easily customized

Ganglia at the RCFGanglia at the RCF

Ganglia at the RCF (1)Ganglia at the RCF (1)

Ganglia at the RCF (2)Ganglia at the RCF (2)

CondorCondor

• Open-source software Open-source software (http://www.cs.wisc.edu/condor)(http://www.cs.wisc.edu/condor)

• Supported by Univ. of WisconsinSupported by Univ. of Wisconsin

• Full-feature batch software with job-queuing Full-feature batch software with job-queuing mechanism, scheduling policy, priority scheme, mechanism, scheduling policy, priority scheme, checkpoint capability, resource monitoring & checkpoint capability, resource monitoring & management management

• Can connect together multiple remote clustersCan connect together multiple remote clusters

Condor (cont.)Condor (cont.)

• Interface with GLOBUS via Condor-GInterface with GLOBUS via Condor-G

• Prototype for Linux Farm batch access in GRID-Prototype for Linux Farm batch access in GRID-like environmentlike environment

• Scalability -- not yet tested in very large-scale Scalability -- not yet tested in very large-scale environment?environment?

• MDS-compatible in RCF environment?MDS-compatible in RCF environment?

Condor & the batch softwareCondor & the batch software

GLOBUS & LSFGLOBUS & LSF

• GLOBUS tools allow remote users to submit GLOBUS tools allow remote users to submit jobs on local clusterjobs on local cluster

• ATLAS prototype at the RCFATLAS prototype at the RCF

• Gatekeeper acts as interface between GLOBUS Gatekeeper acts as interface between GLOBUS and local batch systemand local batch system

• LSF job submitted from gatekeeperLSF job submitted from gatekeeper

GRID & LSF (cont.)GRID & LSF (cont.)

GLOBUS & LSFGLOBUS & LSF

Near-term plansNear-term plans

• Use mature version of ganglia for monitoring. Use mature version of ganglia for monitoring. Use as job scheduler?Use as job scheduler?

• Roll out Condor as part of new batch softwareRoll out Condor as part of new batch software

• Upgrade to LSF v. 5.x – GRID-like featuresUpgrade to LSF v. 5.x – GRID-like features

• Other GRID-like capabilities? Other GRID-like capabilities?

• Security issuesSecurity issues