october,18-22 2004 site report roberto gomezel infn

October,18-22 2004

Site ReportSite ReportRoberto GomezelRoberto Gomezel

INFN INFN

2October,18-22 2004

Outline of PresentationOutline of Presentation

Computing Computing EnvironmentEnvironment

SecuritySecurity ServicesServices NetworkNetwork AFS AFS BBSBBS INFN FarmsINFN Farms Tier 1 at CNAFTier 1 at CNAF

3October,18-22 2004

Computing Environment and Computing Environment and securitysecurity

95% of boxes are PCs running Linux or 95% of boxes are PCs running Linux or Windows Windows

Mac OS boxes keep on livingMac OS boxes keep on living Just a few commercial unix boxes only used for Just a few commercial unix boxes only used for

specific tasks or needsspecific tasks or needs VPNs available in many sites VPNs available in many sites

Cisco boxes using IPsecCisco boxes using IPsec NetScreen boxes using IPsecNetScreen boxes using IPsec SSL VPNs are under evaluationSSL VPNs are under evaluation

The use of SSL eliminates the need of installing client The use of SSL eliminates the need of installing client software software

it enables instant access for users simply using a Web it enables instant access for users simply using a Web browserbrowser

Network SecurityNetwork Security Dedicated Firewall machines just in a few sitesDedicated Firewall machines just in a few sites Implemented with access lists on router connected Implemented with access lists on router connected

to WANto WAN

INFN Site Report – R.Gomezel

4October,18-22 2004

DesktopDesktop

PCs running Linux and Windows PCs running Linux and Windows Automatic installation using Kickstart for Automatic installation using Kickstart for

Linux and RIS for WindowsLinux and RIS for Windows Metaframe Citrix or Vmware used to Metaframe Citrix or Vmware used to

reduce the need to install Windows OS on reduce the need to install Windows OS on all PCs for desktop applicationsall PCs for desktop applications

A few sites chose to outsource support for A few sites chose to outsource support for desktop environment due to lack of desktop environment due to lack of personnelpersonnel


5October,18-22 2004

BackupBackup Tape Libraries used:Tape Libraries used:

AIT2 – a few sitesAIT2 – a few sites IBM Magstar – just used at LNFIBM Magstar – just used at LNF DLT, LTO – wide spreadDLT, LTO – wide spread

Backup tools:Backup tools: IBM Tivoli – quite usedIBM Tivoli – quite used HP Omniback – quite usedHP Omniback – quite used Atempo Time Navigator – just a few sitesAtempo Time Navigator – just a few sites Domestic tool - widespreadDomestic tool - widespread


6October,18-22 2004

Wireless LANWireless LAN Access point running standard 802.11b,gAccess point running standard 802.11b,g All sites are using wireless connection as All sites are using wireless connection as

meeting or conferences are runningmeeting or conferences are running Most of them use it to give connection to Most of them use it to give connection to

laptop computers laptop computers Security issues:Security issues:

Permission based on Secure Port filtering (MAC Permission based on Secure Port filtering (MAC Address) – poor securityAddress) – poor security

No encryption usedNo encryption used Some sites are using 802.1XSome sites are using 802.1X


7October,18-22 2004

E-mailE-mail Mail Transfer AgentMail Transfer Agent

Sendmail – widespread and more used (86%)Sendmail – widespread and more used (86%) Postfix – a few sites (14%)Postfix – a few sites (14%)

But there is an increasing number of sites planning to But there is an increasing number of sites planning to move from sendmail to postfixmove from sendmail to postfix

Hardware and OSHardware and OS


17%

9%

57%

17%

Alpha

Solaris

Intel/Linux

Intel/BSD

8October,18-22 2004

E-mail user agentE-mail user agent

All INFN sites provide an HTTP mail All INFN sites provide an HTTP mail user agent user agent One-third uses IMPOne-third uses IMP One-third uses SQUIRRELOne-third uses SQUIRREL Others:Others:

IMHO, Open WebMail, Cyrus+Roxen…IMHO, Open WebMail, Cyrus+Roxen…

Other mail user agentsOther mail user agents Pine, Internet Explorer, Mozilla…Pine, Internet Explorer, Mozilla…


9October,18-22 2004

E-mail antivirus E-mail antivirus

None32%

Rav27%

Amavis18%

Sophos9%

Clamav5%

Other68%

Vexira9%

None Rav Amavis

Sophos Vexira Clamav


10October,18-22 2004

E-mail antispam E-mail antispam

75% of INFN sites are using SPAM 75% of INFN sites are using SPAM Assassin as tool to reduce junk e-mailAssassin as tool to reduce junk e-mail

Some sites use RAV or SophosSome sites use RAV or Sophos Just a few sites (5%) are using nothingJust a few sites (5%) are using nothing An acl filter was set on port 25 in order An acl filter was set on port 25 in order

to avoid that hosts not authorized can to avoid that hosts not authorized can act as mail relay act as mail relay

Only authorized mail relay are allowed to Only authorized mail relay are allowed to send and receive mail for a specific sitesend and receive mail for a specific site


11October,18-22 2004

Security issuesSecurity issues

Monitored by GARR-CERT Incidents coming from INFN hosts (percentage)

• Goal by the end 2004: •define a new policy for ACL setting•Input filter: default deny

services just on hosts checked very strictly Output filter:

port 25


12October,18-22 2004

INFN networkINFN network LAN backbone network mainly LAN backbone network mainly

based on Gigabit Ethernetbased on Gigabit Ethernet Layer 2 and 3 switchingLayer 2 and 3 switching No layer 4 switchingNo layer 4 switching

The The INFNINFN WAN network is WAN network is completely integrated into the completely integrated into the GARR, nation-wide infrastructure, GARR, nation-wide infrastructure, providing a backbone connectivity providing a backbone connectivity at 2.5 Gigabitat 2.5 Gigabit POP typical access bandwidth for INFN sites: POP typical access bandwidth for INFN sites:

34Mbps, 155 Mbps, Gigabit ethernet34Mbps, 155 Mbps, Gigabit ethernet There is a trend to have a Gigabit Ethernet There is a trend to have a Gigabit Ethernet

access in any site with a bandwidth access in any site with a bandwidth management through rate limiting management through rate limiting mechanism (CAR) according to the needs of mechanism (CAR) according to the needs of the specific sitethe specific site


13October,18-22 2004

AFSAFS INFN sites keep on using AFS services to INFN sites keep on using AFS services to

share data and software throughout sitesshare data and software throughout sites Most of local cells have completely moved Most of local cells have completely moved

server functionality to Linux boxes running server functionality to Linux boxes running OpenAFS softwareOpenAFS software

Authentication and file server functionalities Authentication and file server functionalities of the nation-wide cell INFN.IT are running on of the nation-wide cell INFN.IT are running on Linux boxes with OpenAFS Linux boxes with OpenAFS

The migration of INFN.IT authentication The migration of INFN.IT authentication servers from Kerberos IV to Kerberos V is servers from Kerberos IV to Kerberos V is expected to be accomplished by the end of the expected to be accomplished by the end of the yearyear


14October,18-22 2004

BBS - Bologna Batch SystemBBS - Bologna Batch System

The Bologna Batch System (BBS) is a The Bologna Batch System (BBS) is a software tool that allowssoftware tool that allows users from INFN Bologna to submit batch jobs to a set of well users from INFN Bologna to submit batch jobs to a set of well defined machines, from any INFN defined machines, from any INFN Bologna machines with Condor installedBologna machines with Condor installed..

Collaboration between the C. S. Dept., Univ. of Collaboration between the C. S. Dept., Univ. of Wisconsin-Wisconsin-Madison and the INFN Bologna.Madison and the INFN Bologna.

Main features of BBSMain features of BBS::

Any executable can be submitted to the system (scripts, Any executable can be submitted to the system (scripts, compiled and linked programs, etc.).compiled and linked programs, etc.).

Two different 'queues' , short and long. Short and long Two different 'queues' , short and long. Short and long jobs have a different priority (nice) when running on the jobs have a different priority (nice) when running on the same machine.same machine.

Short jobs may run for no longer than an hour, but run at Short jobs may run for no longer than an hour, but run at a higher priority.a higher priority.

BBS tries to balance the load of the BBS CPUsBBS tries to balance the load of the BBS CPUs. .

P.Mazzanti

15October,18-22 2004

BBSBBS

Presently the system consists of 16 2-CPU servers, Linux RedHat 9 and a single CPU machine. 7 machines are from ALICE experiment.

BBS machines belong to the large INFN WAN Pool; they may be accessed from outside when no BBS job is running, while becoming IMMEDIATELY available when a BBS job asks to be run.

Only short jobs will be accepted by the 7 ALICE machines if submitted non ALICE group user.

P.Mazzanti

16October,18-22 2004

Aggregate jobs, daily

Aggregate jobs, weekly

P.Mazzanti

17October,18-22 2004

boi1.bo.infn.it daily Load

boi1.bo.infn.it weekly Load

P.Mazzanti

18October,18-22 2004

INFN Site Farm: a new INFN Site Farm: a new challengechallenge

Some sites are planning to reconfigure and Some sites are planning to reconfigure and integrate computing facilities and local experiment-integrate computing facilities and local experiment-specific farm into a unique computing farmspecific farm into a unique computing farm Reason: in order to avoid the increasing deployment of a Reason: in order to avoid the increasing deployment of a

lot of little and private farms for each single experiment in lot of little and private farms for each single experiment in addition to the general purpose computing facilityaddition to the general purpose computing facility

Introduction of SAN infrastructure to connect Introduction of SAN infrastructure to connect storage systems and computing unitsstorage systems and computing units GFS file system is under evaluation as an efficient way of GFS file system is under evaluation as an efficient way of

providing a cluster file sytem and volume managerproviding a cluster file sytem and volume manager Interesting because it is part of the SL3 distributionInteresting because it is part of the SL3 distribution

A lot of work for designing a mechanism to provide A lot of work for designing a mechanism to provide computing resources to different experiments computing resources to different experiments according to their needs in a dynamic wayaccording to their needs in a dynamic way We can learn from the experience coming from CNAF Tier1 We can learn from the experience coming from CNAF Tier1

and other Labsand other Labs


19October,18-22 2004

Hardware solutions Hardware solutions for the Tier1 at CNAFfor the Tier1 at CNAF

Luca Luca dell’Agnello dell’Agnello Stefano ZaniStefano Zani(INFN – CNAF, Italy)(INFN – CNAF, Italy)

Luca dell’Agnello -Stefano Zani

20October,18-22 2004

Tier1Tier1 INFN computing facility for HEP communityINFN computing facility for HEP community

Ending prototype phase last year, Ending prototype phase last year, now fully operationalnow fully operational Location: INFN-CNAF, Bologna (Italy)Location: INFN-CNAF, Bologna (Italy)

One of the main nodes on GARR networkOne of the main nodes on GARR network Personnel: ~ 10 FTE’sPersonnel: ~ 10 FTE’s

~ 3 FTE's dedicated to experiments~ 3 FTE's dedicated to experiments Multi-experimentMulti-experiment

LHC experiments(Alice, Atlas, CMS, LHCb), Virgo, CDF, BABAR, LHC experiments(Alice, Atlas, CMS, LHCb), Virgo, CDF, BABAR, AMS, MAGIC, ...AMS, MAGIC, ...

Resources dynamically assigned to experiments according to their Resources dynamically assigned to experiments according to their needsneeds

50% of the Italian resource for LCG50% of the Italian resource for LCG Participation to experiments data challengeParticipation to experiments data challenge Integrated with Italian Grid Integrated with Italian Grid Resources accessible also in traditional wayResources accessible also in traditional way


21October,18-22 2004

Logistics Logistics Moved to a new location (last January)Moved to a new location (last January)

Hall in the basement (-2Hall in the basement (-2ndnd floor) floor)~ 1000 m~ 1000 m22 of total space of total space

Computing Nodes Computing Nodes Storage DevicesStorage Devices Electric Power System (UPS)Electric Power System (UPS) Cooling and Air conditioning systemCooling and Air conditioning system Garr GPopGarr GPop

Easily accessible with lorries from the roadEasily accessible with lorries from the roadNot suitable for office use (remote control Not suitable for office use (remote control needed)needed)


22October,18-22 2004

Electric PowerElectric Power Electric Power GeneratorElectric Power Generator

1250 KVA (~ 1000 KW)1250 KVA (~ 1000 KW) up to 160 racksup to 160 racks

Uninterruptible Power Supply (UPS)Uninterruptible Power Supply (UPS)Located into a separate room (conditioned and Located into a separate room (conditioned and

ventilated)ventilated)800 KVA (~ 640 KW)800 KVA (~ 640 KW)

380 V three-phase distributed to all racks (Blindo)380 V three-phase distributed to all racks (Blindo)Rack power controls output 3 independent 220 V Rack power controls output 3 independent 220 V

lines for computerslines for computersRack power controls sustain burden up to 16 or 32 A Rack power controls sustain burden up to 16 or 32 A

32 A power controls needed for Xeon 36 bi-processors racks32 A power controls needed for Xeon 36 bi-processors racks

3 APC power distribution modules (24 outlets each) 3 APC power distribution modules (24 outlets each)


23October,18-22 2004

Cooling & Air Cooling & Air ConditioningConditioning

RLS (Airwell) on the roof RLS (Airwell) on the roof ~ ~ 700 KW700 KW Water coolingWater cooling Need “booster pump” (20 mts T1 Need “booster pump” (20 mts T1 roof) roof) Noise insulationNoise insulation

1 Air Conditioning Unit (uses 20% of RLS 1 Air Conditioning Unit (uses 20% of RLS refreshing power and controls humidity)refreshing power and controls humidity)

12 Local Cooling Systems (Hiross) in the 12 Local Cooling Systems (Hiross) in the computing roomcomputing room


24October,18-22 2004

WN typical Rack WN typical Rack CompositionComposition

Power Controls (3U)Power Controls (3U) 1 network switch (1-1 network switch (1-

2U)2U) 48 FE copper 48 FE copper

interfacesinterfaces 2 GE fiber uplinks2 GE fiber uplinks

34-36 1U WNs34-36 1U WNs Connected to network Connected to network

switch via FEswitch via FE Connected to KVM Connected to KVM

system system


stefano

foto rackchiedere a pietro dettagli

25October,18-22 2004

Remote console Remote console controlcontrol

Paragon UTM8 (Raritan) Paragon UTM8 (Raritan) 8 Analog (UTP/Fiber) output connections 8 Analog (UTP/Fiber) output connections Supports up to 32 Supports up to 32 daisy chainsdaisy chains of 40 nodes of 40 nodes

(UKVMSPD modules needed) (UKVMSPD modules needed) Costs: 6 KEuro + 125 Euro/server (UKVMSPD Costs: 6 KEuro + 125 Euro/server (UKVMSPD

module)module) IP-reach (expansion to support IP transport) IP-reach (expansion to support IP transport)

evaluted but not usedevaluted but not used Autoview 2000R (Avocent)Autoview 2000R (Avocent)

1 Analog + 2 Digital (IP transport) output 1 Analog + 2 Digital (IP transport) output connections connections

Supports connections up to 16 nodes Supports connections up to 16 nodes Optional expansion to 16x8 nodesOptional expansion to 16x8 nodes

Compatible with Paragon (“gateway” to IP)Compatible with Paragon (“gateway” to IP)


26October,18-22 2004

Networking (1)Networking (1) Main Network infrastructure based on optical Main Network infrastructure based on optical

fibres (~ 20 Km)fibres (~ 20 Km) To ease adoption of new (High Performances) To ease adoption of new (High Performances)

transmission technologiestransmission technologies To insure a better electrical insulation on long To insure a better electrical insulation on long

distancesdistances Local (Rack wide) links with UTP (copper) cablesLocal (Rack wide) links with UTP (copper) cables

LAN has a “classical” star topologyLAN has a “classical” star topology GE core switch (Enterasys ER16)GE core switch (Enterasys ER16) NEW core switch (Black Diamond 10808 ) is in pre NEW core switch (Black Diamond 10808 ) is in pre

productionproduction 120 Gbit Fiber (Scale up to 480 ports)120 Gbit Fiber (Scale up to 480 ports) 12 10 Gbit Ethernet (Scale up to max 48 ports)12 10 Gbit Ethernet (Scale up to max 48 ports)

Farms up-link via GE trunk (Channel) to core switchFarms up-link via GE trunk (Channel) to core switch Disk Servers directly connected to GE switch (mainly fibre)Disk Servers directly connected to GE switch (mainly fibre)


27October,18-22 2004

Networking (2)Networking (2) WN's connected via FE to rack switch (1 switch per WN's connected via FE to rack switch (1 switch per

rack)rack) Not a single brand for switches (as for wn's)Not a single brand for switches (as for wn's)

3 Extreme Summit 48 FE + 2 GE ports3 Extreme Summit 48 FE + 2 GE ports 3 3550 Cisco 48 FE + 2 GE ports3 3550 Cisco 48 FE + 2 GE ports 8 Enterasys 48 FE 2GE ports8 Enterasys 48 FE 2GE ports 10 switch Summit400 48 GE copper + 2 GE ports + 10 switch Summit400 48 GE copper + 2 GE ports +

(2x10Gb ready) (2x10Gb ready) Homogeneous characteristics Homogeneous characteristics

48 Copper Ethernet ports48 Copper Ethernet ports Support of main standards (e.g. 802.1q)Support of main standards (e.g. 802.1q) 2 Gigabit up-links (optical fibers) to core switch2 Gigabit up-links (optical fibers) to core switch

CNAF interconnected to GARR-G backbone at 1 Gbps.CNAF interconnected to GARR-G backbone at 1 Gbps.


28October,18-22 2004

FarmSW3(IBM)

NA

S4

FarmSWG1

SSR8600

FarmSW1

FarmSW2(Dell)

LHCBSW1

NA

S2

NA

S3

S.Zani

FarmSW4(IBM3)Catalyst3550

FarmSW5(3Com)

DE

LL

A

XU

S

SA

N

Disk Servers

F.C.

F.C.

F.C.

F.C.

FarmSW9

FarmSW12131.154.99.121

FarmSW6

FarmSW7

FarmSW8 FarmSW10

FarmSW11

FarmSWG2

ST

K

F.C.

1st Floor

Internal services

T1

Babar SW

NA

S1

Network Network ConfigurationConfiguration

Info

rtrend

F.C.

IBM

FasT

900

GARR

1 Gb/s

29October,18-22 2004

L2 ConfigurationL2 Configuration Each Experiment has its own VLANEach Experiment has its own VLAN Solution adopted for complete Solution adopted for complete

granularitygranularityPort based VLAN Port based VLAN VLAN identifiers are propagated across VLAN identifiers are propagated across switches (802.1q)switches (802.1q)

Avoid recabling (Avoid recabling (or physical movingor physical moving) of ) of machines to change farm topologymachines to change farm topology

Level 2 isolation of farmsLevel 2 isolation of farms Possibility to define multi-tag (Trunk) Possibility to define multi-tag (Trunk)

ports (for servers)ports (for servers)


30October,18-22 2004

Power SwitchesPower Switches 2 models used at Tier1:2 models used at Tier1:

• ““Old” APC MasterSwitch Old” APC MasterSwitch Control Unit AP9224 Control Unit AP9224 controlling 3x8 outlets controlling 3x8 outlets 9222 PDU from 1 Ethernet9222 PDU from 1 Ethernet

• ““New” APC PDU Control New” APC PDU Control Unit AP7951 controlling Unit AP7951 controlling 24 outlets from 1 Ethernet24 outlets from 1 Ethernet

““zero” Rack Unit (vertical zero” Rack Unit (vertical mount)mount)

Access to the Access to the configuration/control menu configuration/control menu via serial/telnet/web/snmpvia serial/telnet/web/snmp

1 Dedicated machine 1 Dedicated machine running APC running APC Infrastruxure Infrastruxure Manager SoftwareManager Software (in (in progress)progress)


31October,18-22 2004

Remote Power Remote Power Distribution UnitDistribution Unit

Screenshot of APC Infrastruxure Manager Software with the status of all TIER1 PDU


32October,18-22 2004

Computing unitsComputing units ~ 800 1U rack-mountable Intel dual ~ 800 1U rack-mountable Intel dual

processor serversprocessor servers 800 MHz – 3.06 GHz 800 MHz – 3.06 GHz ~ 700 wn’s (~ 1400 CPU’s) available for LCG~ 700 wn’s (~ 1400 CPU’s) available for LCG

Tendering:Tendering: HPC farm with MPIHPC farm with MPI

Servers interconnected via InfinibandServers interconnected via Infiniband Opteron farm (near future)Opteron farm (near future)


33October,18-22 2004

Storage ResourcesStorage Resources~200 TB RAW Disk Space ON LINE.~200 TB RAW Disk Space ON LINE.

NASNAS NAS1+NAS4 (3Ware low cost) NAS1+NAS4 (3Ware low cost) Tot 4.2 TBTot 4.2 TB NAS2+NAS3 (Procom)NAS2+NAS3 (Procom) Tot 13.2 TBTot 13.2 TB

SAN SAN Dell Powervault 660fDell Powervault 660f Tot 7Tot 7TBTB Axus (Brownie)Axus (Brownie) Tot 2Tot 2TBTB STK BladestoreSTK Bladestore TotTot 9 9 TBTB Infortrend ES A16F-R Infortrend ES A16F-R TotTot 1212 TBTB IBM Fast-T 900IBM Fast-T 900 Tot 150 TBTot 150 TB


34October,18-22 2004

STORAGE resourceSTORAGE resourceCLIENT SIDE

WAN or TIER1 LAN

PROCOM NAS2Nas2.cnaf.infn.it8100 GbyteVIRGO ATLAS

Fileserver CMS diskserv-cms-1

PROCOM NAS3Nas3.cnaf.infn.it4700 GbyteALICE ATLAS

IDE NAS1,NAS4Nas4.cnaf.infn.it1800+2000 GbyteCDF LHCB

AXUS BROWIECirca 2200 GByte 2 FC interface

DELL POWERVAULT7100 GByte2 FC interface

FAIL-OVERsupport

Gadzoox SlingshotFC Switch 18 port

RAIDTEC1800 Gbyte2 SCSI interfaces

CASTORServer+staging

STK180 with 100 LTO (10Tbyte Native)

Fileserver Fcds2

Alias diskserv-ams-1 diskserv-atlas-1

STK BladeStoreCirca 10000 GByte 4 FC interface

STK L5500 robot (max 5000) 6 LTO-2

InfortrendES A16F-R12 TB


35October,18-22 2004

Storage management and Storage management and access (1)access (1) Tier1 storage resources accessible as Tier1 storage resources accessible as

classical storage or via grid classical storage or via grid Non grid disk storage accessible via NFSNon grid disk storage accessible via NFS Generic WN’s also have AFS client Generic WN’s also have AFS client NFS mount volumes configured via autofs NFS mount volumes configured via autofs

and ldap and ldap unique configuration repository eases unique configuration repository eases maintenancemaintenance

in progress: integration of ldap configuration in progress: integration of ldap configuration with Tier1 db datawith Tier1 db data

Scalability issues with NFSScalability issues with NFSExperienced stalled mount pointsExperienced stalled mount points


36October,18-22 2004

Storage management and Storage management and access (2)access (2)

Part of disk storage used as front-end to CASTORPart of disk storage used as front-end to CASTOR Balance between disk and CASTOR according to Balance between disk and CASTOR according to

experiments needsexperiments needs 1 stager for each experiment (installation in 1 stager for each experiment (installation in

progress)progress) CASTOR accessible both directly or via gridCASTOR accessible both directly or via grid

CASTOR SE availableCASTOR SE available ALICE Data Challenge used CASTOR ALICE Data Challenge used CASTOR

architecturearchitecture Feedback to CASTOR teamFeedback to CASTOR team Need optimization for file restagingNeed optimization for file restaging


37October,18-22 2004

Tier1 DatabaseTier1 Database Resource database and Resource database and management interfacemanagement interface

Postgres database as back endPostgres database as back end Web interface (apache+mod_ssl+php)Web interface (apache+mod_ssl+php) Hw servers characteristics Hw servers characteristics Sw servers configurationSw servers configuration Servers allocationServers allocation

Possible direct access to db for some applicationsPossible direct access to db for some applications Monitoring systemMonitoring system NagiosNagios

Interface to configure switches and interoperate Interface to configure switches and interoperate with installation system.with installation system.


38October,18-22 2004

Installation Installation issuesissues

Centralized installation systemCentralized installation systemLCFG (EDG WP4)LCFG (EDG WP4)Integration with a central Tier1 db Integration with a central Tier1 db Moving from a farm to another Moving from a farm to another implies just changes in IP implies just changes in IP address (not name)address (not name)

Unique dhcp server for all VLANsUnique dhcp server for all VLANsSupport for DDNS (cr.cnaf.infn.it)Support for DDNS (cr.cnaf.infn.it)

Investigating Quattor for future Investigating Quattor for future needsneeds


39October,18-22 2004

Our Desired Solution for Our Desired Solution for Resource AccessResource Access

SHARED RESOURCES among all experimentsSHARED RESOURCES among all experiments Priorities and reservations managed by the Priorities and reservations managed by the

schedulerscheduler Most of Tier1 computing machines installed as Most of Tier1 computing machines installed as

LCG Worker Nodes, with light modifications to LCG Worker Nodes, with light modifications to support more VOssupport more VOs

Application Software not directly installed on Application Software not directly installed on WNs but accessed from outside (NFS, AFS, …)WNs but accessed from outside (NFS, AFS, …)

One or more Resource Manager to manage all One or more Resource Manager to manage all the WNs in a centralized waythe WNs in a centralized way

Standard way to access Storage for each Standard way to access Storage for each applicationapplication


october,18-22 2004 site report roberto gomezel infn

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