Device quotas limit the number of objects in the disk group which create associated device nodes in the file system. Device quotas are useful for disk groups which to be transferred between Linux with a pre-2.6 kernel and other supported platforms. Prior to the 2.6 kernel, Linux supported only 256 minor devices per major device.

You can limit the number of devices that can be created in a given CDS disk group by setting the device quota.

When you create a device, an error is returned if the number of devices would exceed the device quota. You then either need to increase the quota, or remove some objects using device numbers, before the device can be created.