Creating more than 8 loop back devices in Linux

By default Linux  supports only 8 loop back devices which means we can mount maximum 8 loop back devices(for Eg: 8 iso images)and maximum supported loop back devices by OS is 64.  If you tried to mount the 9 th devices, you may get an error "mount could not find a spare loop device" error.  Below script create the loop back devices from 8 to 64 

for ((i=8;i<64;i++)); do
[ -e /dev/loop$i ] || mknod -m 0600 /dev/loop$i b 7 $i
done

Enjoy.... Now you can mount up to 64

My non interactive jumpstart server sample configuration-using iso image

#creating a loopback device using iso image

root@cat # lofiadm -a /admin/unix/jump/ISO/sol-10-u5-ga-sparc-dvd.iso /dev/lofi/1

#mouting lofidevice to /mnt

root@cat # mount -F hsfs /dev/lofi/1 /mnt

#command for copying DVD content inclulding boot block to the machine (normal jumpstart command)

root@cat # /mnt/Solaris_10/Tools/setup_install_server /admin/unix/jump/10u5/

root@cat # cat sysidcfg

system_locale=en_US

timezone=Asia/Riyadh

network_interface=primary {protocol_ipv6=no netmask=255.255.254.0 default_route=none}

terminal=vt100

security_policy=NONE

name_service=NONE

timeserver=localhost

root_password=e1VrOBR04fXBY

nfs4_domain=dynamic

keyboard=US-English

root@cat # cat rules

#This is the role set for each machine. Eg is given in first second line

hostname cat - solaris10.flar -

hostname gorilla-mgt - gorilla.os gorilla.finish

hostname bear-mgt - v245.flar bear.finish

hostname tiger-mgt - v245.flar tiger.finish

root@cat # cat gorilla.os

install_type initial_install

system_type standalone

partitioning explicit

filesys rootdisk.s0 40460 /

filesys rootdisk.s1 16384 swap

filesys rootdisk.s3 76001 /var

filesys rootdisk.s4 2007 /opt/patrol

filesys rootdisk.s5 2007 /opt/tivoli

filesys rootdisk.s7 100 unnamed

cluster SUNWCprog

package SUNWman delete

cluster SUNWCacc

root@cat # cat v245.flar

install_type flash_install

archive_location nfs 10.14.48.26:/admin/unix/jump/flars/V245.flar

partitioning explicit

filesys rootdisk.s0 40460 /

filesys rootdisk.s1 16384 swap

filesys rootdisk.s3 76001 /var

filesys rootdisk.s4 2007 /opt/patrol

filesys rootdisk.s5 2007 /opt/tivoli

filesys rootdisk.s7 100 unnamed

root@cat # cat gorilla.finish

echo "Starign post scripts"

echo "10.14.11.172 gorilla-bge1 gorilla-bge1.prod.mobily.lan">>/a/etc/hosts

echo "10.14.11.173 gorilla-nxge0 gorilla-nxge0.prod.mobily.lan">>/a/etc/hosts

echo "10.14.11.174 gorilla gorilla.prod.mobily.lan">>/a/etc/hosts

#Lines for adding ipmp configuration automatically

echo "gorilla-bge1 deprecated -failover netmask + broadcast + group development up" > /a/etc/hostname.bge1

echo "addif gorilla netmask + broadcast + up" >> /a/etc/hostname.bge1

echo "gorilla-nxge0 deprecated -failover netmask + broadcast + group development up">/a/etc/hostname.nxge0

echo "10.14.11.0 255.255.255.0" >>/a/etc/netmasks

echo "10.14.11.1" >/a/etc/defaultrouter

rm -r /a/.ssh

mkdir /a/.ssh

echo "ssh-dss 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 root@cat">/a/.ssh/authorized_keys

#command for adding one clinent

../10u5/Solaris_10/Tools/add_install_client -e 0:14:4f:d2:e8:d0 -s 10.14.48.26:/admin/unix/jump/10u5/ -c 10.14.48.26:/admin/unix/jump/config -p 10.14.48.26:/admin/unix/jump/config gorilla sun4u

root@cat # cat /etc/ethers |grep gorilla

0:14:4f:d2:e8:d0 gorilla-mgt

root@cat # cat /etc/hosts|grep gorilla

10.14.48.27 gorilla-sc

10.14.48.28 gorilla-mgt