Error about loop device... Kindly help..

ashishshukla · 05-29-2009, 08:20 AM

Hi Friends,
I installed XEN in RHEL5.2. But when i created virtual machines after some machines i got an error after that i am not able to create new virtual machines. Kindly see the below error -

Error: Device 768 (vbd) could not be connected. Failed to find an unused loop device.

Please help me how to resolve this error? Also please tell me what is this error and why it came ?

Is this error is a comman or it comes due to some problems in physical server ? Please explain this.

Thanks

colucix · 05-30-2009, 05:16 PM

Quote:

Failed to find an unused loop device.

Indeed you're out of loop devices. The maximum number of loop device is 8 by default, but you can manually create them using the mknod command:

Code:

mknod -m660 /dev/loopXXX b 7 8

where loopXXX is loop8, loop9, loop10 and so on. Then you can instruct the kernel to create a greater number of loop devices the next time you reboot, by adding max_loop=64 (e.g. for 64 loop devices) to the kernel options in /boot/grub/menu.lst.