How to create a new loop device in CentOS6.3

A recent installation of a PXE network to install a Linux server requires a large number of loop devices to mount an ISO image as a system installation source. In fact, to build a complete PXE installation server, the source configuration is still a big problem, advanced point, large point I would like to use the way of Rsync direct synchronization of the official source bar.
Well, the nonsense is not much to say, I believe many people will encounter such mount Hint: mount:could not found any free loop device
It means that you can't find an idle loop device.
As everyone knows, Linux system device files exist under the directory/dev/. Let's take a look at the number of existing loop devices:

The code is as follows

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[root@localhost html]# losetup-a /dev/loop0: [0803]:5506094 (/var/www/html/centos-5.8-x86_64-bin-dvd-1of2.iso) /dev/loop1: [ 0803]:5506099 (/var/www/html/centos-5.9-x86_64-bin-dvd-1of2.iso) /dev/loop2: [0803]:5506103 (/var/www/html/ Centos-6.0-x86_64-bin-dvd1.iso) /dev/loop3: [0803]:5506105 (/var/www/html/centos-6.1-x86_64-bin-dvd1.iso) /DEV/LOOP4: [0803]:5505636 (/var/www/html/centos-6.2-x86_64-bin-dvd1.iso) /DEV/LOOP5: [0803]:5506068 (/var/www/ Html/centos-6.3-x86_64-bin-dvd1.iso) /dev/loop6: [0803]:5506109 (/var/www/html/centos-6.4-x86_64-bin-dvd1.iso /DEV/LOOP7: [0803]:5506016 (/var/www/html/centos-6.5-x86_64-bin-dvd1.iso) /DEV/LOOP8: [0803]:5506127 (/var /www/html/centos-7.0-1406-x86_64-dvd.iso)

CentOS 6.3, the default loop device is only LOOP0-LOOP7 these 8, we use the Mknod command to create a loop block device, creating a loop block device is very simple, a command can be done:
Mknod-m 0660/dev/loopx B 7 X
Note that the loopx corresponds to the X. As in the following example:

We can use the Losetup command to see the number of loop block device that are already in use. Losetup-a |wc-l