A DEVSPACE is either a "raw" device or a "character" device or a UNIX file which contains the whole data or at least part of the data of a SERVERDB.
DEVSPACEs of a SERVERDB must not be created on the same physical disk.
It is recommended to use "raw" or "character" devices as DEVSPACEs.
For further information about DEVSPACEs, see the CONTROL manual, Section 2.