3995-SDA stands for a 3995 with self-description architecture.
Self-description architecture allows the 3995 hardware to provide
information concerning the optical library and optical drives to the
OAM. This allows OAM to depend on information provided by the hardware
without having to perform validity checking on its own. Although the
3995-13x models are not self-descriptive
devices, the preferred method for defining all 3995 libraries is to
use the 3995-SDA definition method.
To define the device numbers for a channel attached 3995 library,
perform the following steps:
- Use the Add Control Unit panel to define 3995-SDA type control
units. Specify the base device number of each 3995 controller (3995-13x or 3995-C3A model) as a control unit. The base
device number for 3995 library controller must be a multiple of 16,
meaning the low order digit of this device number must end in zero,
for example, 0940 or 0AC0. This is the control unit number that must
be used when attaching the channel paths to the 3995. The unit addresses
for the 3995 control unit must begin with 00 when attached to ESCON
CHPIDs.
- Use the Add Device panel to define the 3995. You must supply the
starting device number; the low order digit of this device number
must end in zero, for example 0940 or 0AC0. The device type must be
a 3995-SDA. You can reserve device numbers for future drive expansions
of the library. This allows you to best utilize channel address resources
while allowing for the planning of future upgrades of the drives.
The number of devices must be greater than zero and less than or equal
to 256. The default is 16. The control unit number is the same as
the base device number. Using the default number of devices as an
example, devices 0AC0–0ACF are generated.
Note: The
3995 does not belong to any esoteric device group and is not reserved
through device allocation.