* This command activates or (if "activate" is false)
* deactivates all logical volumes in the listed volume
* groups "volgroups". If activated, then they are made
* known to the kernel, ie. they appear as "/dev/mapper"
* devices. If deactivated, then those devices disappear.
* This command activates or (if "activate" is false)
* deactivates all logical volumes in the listed volume
* groups "volgroups". If activated, then they are made
* known to the kernel, ie. they appear as "/dev/mapper"
* devices. If deactivated, then those devices disappear.