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VALENCIA TESTBED SITE

IFIC(Instituto de Física Corpuscular)Universitat de València-CSIC

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GoG Farm

192 Athlon PC (134 IFIC + 58 ICMOL) VIA KT133A & KT266A based MotherBoard CPU: AMD Athlon K7 @ 1.2 & 1.4 GHz RAM: 2x512 Mbytes (SDRAM & DDR

SDRAM) HD: 40 Gbytes NIC: 3COM 905CX & RealTek RTL8139 (Fast

Ethernet + PXE) 2U chassis

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GoG Farm

9 racks (800x600 mm)22 PCs + 1 network switch per rack2U chassis with 3 fans

pros:less space required

cons:add 240 euros per PC (aprox.)heat concentration

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GoG Farm

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GoG Farm

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GoG Farm

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GoG Farm

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GoG Farm

2U chassis Athlon PC

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Local Network

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Local Network

All Worker Nodes have private IP addresses in the net 192.168.4.0/22 secure environment administrative independence from

University network management staffCommunication equipment have

public IP addresses in the net 147.156.149.64/26 can be monitored and upgraded from

University centralized service

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Local network

External communications go through gog01 in which NAT rules are applied Connections from Worker Nodes to

public nodes are allowed through masquerading with some restrictions, eg:FTP requires passive mode

Connections from external nodes to Worker Nodes requires a previous NAT rule to be configured.

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Monitoring

GoG Heartbeat Senders (worker nodes) send multicast

packets with node info & status in xml format at time intervals.

Receivers collect info to build statistics or to present a graphical view of the farm to an operator

pros:connectionlessseveral receivers can run at the same time

cons:everybody can read packets

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Monitoring

Main window: dead/alive

status cpu usage memory disk

(picture refers to IFIC network, not farm)

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Monitoring

Client info window reflects info sent

by the client as obtained mostly

from /proc

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LCFG configuration

LCFG configuration is being deployed Worker nodes boots always using

PXEDHCP server sends:

A PXE_MENU with remote linux image and parameters the first time.

A PXE_MENU with local boot other times

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LCFG configuration

Use slightly modified LCFG package to: use PXE booting allow extended partitions on HD allow different domain than ypdomain notify DHCP server at the end of

installation the first time

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LCFG configuration

We plan to switch to LCFG to configure Worker Nodes, but lack of some LCFG objects prevent us from doing it now (however, it seems that it will be solved soon)

But, we will use LCFG to configure our Crossgrid TestBed for sure.

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Current grid ActivitiesWe are participating in this year in the

DATA CHALLENGE (DC1) of ATLAS experiment with to goals: Event production in our farm in order to provide

samples for physics studies and make the Technical Design Report for the end of 2002.

To test in our farm the new software, including Geant4, the new event data model and the evaluation of database technologies (e.g. Root-I/O).