Setting up a BaBar Xrootd Server

The initial setup and configuration of the daemon needs to be done as root, once that is done configuring the BaBar software to use the xrootd server and importing data to it can be done as a bfactory equivalant account.

This write up assumes the processes will be run as bfactory and the data will be held in /data

Setting up the Daemon

• Install the base rpm (from http://xrootd.slac.stanford.edu/):

rpm -Uvh http://xrootd.slac.stanford.edu/download/<version>/xrootd-<version>.i386_rhel30.i386.rpm

• Write a config file /opt/xrootd/etc/xrootd.cf

Example xrootd.cf File

# Simple xrootd config for Bham
# CAJB 20050908

# Xrd Configuration

# xrootd configuration
xrootd.fslib /opt/xrootd/lib/libXrdOfs.so xrootd.export /store #xrootd.trace request

#OSS Configuration
oss.path /store r/o
oss.localroot /data/
ofs.trace open

• Create a local StartXRD.cf startup config file by editing the example file:

Example StartXrd.cf Diffs

18c18
< XRDUSER=bbdatsrv
---
> XRDUSER=bfactory
28c28
< XRDVER=prod
---
> XRDVER=
42c42
< XRDHOMEDIR=/var/adm/xrootd/core
---
> XRDHOMEDIR=/opt/xrootd/core
47c47
< XRDLOGDIR=/var/adm/xrootd/logs
---
> XRDLOGDIR=/opt/xrootd/logs
59,73c59,73
< RESP=`/usr/local/bin/taylor -q opts | grep '^olbd=.*super'` < if [ $? -eq 0 ]; then < XRDMODE='-r -t'
< XRDTYPE='supervisor'
< fi
< RESP=`/usr/local/bin/taylor -q opts | grep '^olbd=.*server'` < if [ $? -eq 0 ]; then < XRDMODE='-t'
< XRDTYPE='target'
< fi
< RESP=`/usr/local/bin/taylor -q opts | grep '^olbd=.*manager'` < if [ $? -eq 0 ]; then < XRDMODE='-r'
< XRDTYPE='manager'
< fi
---
> #RESP=`/usr/local/bin/taylor -q opts | grep '^olbd=.*super'` #if [ $? 
> -eq 0 ]; then #XRDMODE='-r -t'
> #XRDTYPE='supervisor'
> #fi
> #RESP=`/usr/local/bin/taylor -q opts | grep '^olbd=.*server'` #if [ $? 
> -eq 0 ]; then #XRDMODE='-t'
> #XRDTYPE='target'
> #fi
> #RESP=`/usr/local/bin/taylor -q opts | grep '^olbd=.*manager'` #if [ 
> $? -eq 0 ]; then #XRDMODE='-r'
> #XRDTYPE='manager'
> #fi

• Create and set the ownership of the log and core dirs:

mkdir /opt/xrootd/logs /opt/xrootd/core
chown bfactory:babar /opt/xrootd/logs /opt/xrootd/core

• Copy over and set up the sysV init script and set xrootd to start at system startup

chkconfig xrootd on

• Make the data directory

mkdir /data/store
chown bfactory:babar /data/store

Configuring the BaBar Software to use the Server

This should be done as bfactory

• Write the $BFROOT/kanga/config/KanAccess.cfg file

Sample simple SP only KanAccess.cfg from Birmingham

read /store/SP/BkgTriggers* xrootd epbf002.ph.bham.ac.uk

This file should be copied to the VO_BABAR_SW_AREA at part of the Site setup.

• Make the BkgTriggers Area

mkdir -p /data/store/SP/BkgTriggers

• Import some Collections

scp 'bbdatsrv@csfmove01.rl.ac.uk:/stage/bdata-data37/kanga/store/SP/BkgTriggers/BkgTriggers_200201_O*' .

--Chris brew 17:57, 26 Oct 2005 (BST)