The blades need to be configured to attempt to boot from the network before booting from the hard drive.
On the VCL management node:
wget -N -P /etc/yum.repos.d http://sourceforge.net/projects/xcat/files/yum/xcat-dep/rh6/x86_64/xCAT-dep.repo
wget -N -P /etc/yum.repos.d http://sourceforge.net/projects/xcat/files/yum/2.8/xcat-core/xCAT-core.repo
yum clean all
yum install -y xCAT
chtab key=master site.value=<management node private IP address>
chtab key=nameservers site.value=<management node private IP address>
chtab key=forwarders site.value=<DNS server address>
chtab key=dhcpinterfaces site.value=<management node private NIC>
chtab key=domain site.value=vcl.local
chtab netname=<public> networks.disable=1
chtab key=cmm passwd.username=<AMM SNMPv3 username> passwd.password=<AMM SNMPv3 password>
chtab key=system passwd.username=root passwd.password=<installed node root password>
nodeadd <AMM name> groups=amm,all
chdef -t group amm mgt=blade
chdef -t group amm mpa=<AMM name> ip=<AMM IP address>
chtab mpa=<AMM name> mpa.username=<AMM SNMPv3 username> mpa.password=<AMM SNMPv3 password>
nodeadd vclh3-7-vclh3-8 groups=all,blade,compute
chtab node=compute noderes.tftpserver=<management node private IP address> noderes.nfsserver=<management node private IP address> noderes.xcatmaster=<management node private IP address>
chtab mpa=bch3 mpa.username=<AMM SNMPv3 username> mpa.password=<AMM SNMPv3 password>
for i in {7..8} ; do chtab node=vclh3-$i mp.mpa=bch3 mp.id=$i ; done
getmacs blade -i $NODE_MGT_NIC
makedhcp -n
chkconfig dhcpd on
service dhcpd start
makedhcp /vcl-n.*
ddns-update-style none;
rndc-confgen -a -r /dev/urandom
makedns
#wget -N -P /install/software $CENTOS_ISO_BASE_URL/$CENTOS_ISO_FILENAME
copycds /install/software/$CENTOS_ISO_FILENAME
chdef /vclh3.* os=centos64 arch=x86_64 profile=centos64-minimal
nodeset vclh3-7 install
rpower vclh3-7 boot