Increace loop devices.

Loop devices

============

 

Increasing the number of loop devices

-------------------------------------

If you see "mount: could not find any free loop device" you have

to increase the number of loop devices by adding the following

to /etc/modprobe.conf on a 2.6 kernel (or /etc/modules.conf on

a 2.4 kernel).

 

----

options loop max_loop=64

----

 

To make this active, unmount all loop-mounts and then remove the loop

module from the kernel:

 

----

rmmod loop

----

 

Or alternatively, reboot your system :)

 

 

Verify the maximum number of loop devices

-----------------------------------------

You can verify the new maximum number of loop devices by doing:

 

 dmesg | grep loop:

 

You should see something similar to:

 

 Aug  9 16:36:20 emyn kernel: loop: loaded (max 256 devices)

 

 

Creating extra loop device entries

----------------------------------

Also make sure you have enough devices available. You can

check how many you have by doing:

 

 ls -d /dev/loop*

 

An easy way to create more, is by doing:

 

for i in $(seq 0 255); do

mknod -m0660 /dev/loop$i b 7 $i

chown root.disk /dev/loop$i

done

 

You can have up to 256 loop devices mounted.

 

PS Unfortunately SLES9 has compiled the loop module inside the kernel,

therefor you have to add 'max_loop=64' to the kernel parameters directly

and you require a reboot.

 

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Please send me improvements to this document.