30.6.2. Configuring the Loopback Device Limit
The maximum number of loopback devices in Red Hat Enterprise Linux 6 is set by the
max_loopkernel option. For example, to set the maximum number of loopback devices to
64, edit the
/etc/grub.conffile, and add
max_loop=64at the end of the kernel line. The line in
/etc/grub.confwould then look something like this:
kernel /vmlinuz-2.6.32-131.0.15.el6.x86_64 ro root=/dev/mapper/root rhgb quiet max_loop=64 initrd /initramfs-2.6.32-131.0.15.el6.x86_64.imgReboot the system for the changes to take affect.
By default, eight
/dev/loop7) are automatically generated, but others can be created as desired. For example, to set up a ninth loop device named
/dev/loop8, issue the following command as
~]#Thus, an administrator on a system with a Red Hat Enterprise Linux 6 kernel can create the desired number of loopback devices manually, with an init script, or with a
mknod /dev/loop8 b 7 8
max_loophas been set before the system booted,
max_loopbecomes a hard limit on the number of loopback devices, and the number of loopback devices cannot be dynamically grown beyond the limit.