When a virtual machine is running, each of its file-backed virtual disks consumes a loopback device on the host. By default, the host allows up to eight loopback devices to be consumed.
To simultaneously run more file-backed virtual disks on a host, you can increase the number of available loopback devices by adding the following option to the host’s /etc/modprobe.conf.local file.
options loop max_loop=x
where x is the maximum number of loopback devices to create.
Changes take effect after the module is reloaded.
HINT:Enter rmmod loop and modprobe loop to unload and reload the module.