StorageTek Host Software Component 6.0, System Programmer'S Manual

Page: 166 / 718

136 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
Unit Attribute (UNITATTR) Control Statement
The UNITATTR statement specifies unit attributes and allows the user to define the model
number of transports. A series of UNITATTR statements can be specified and are
contained in the definition data set named in the UNITDEF statement. The first statement
that matches the requested attributes is used. (Refer to “Unit Attribute Definition
(UNITDEF) Command and Control Statement” on page 140 for details on syntax and
parameters.) The UNITATTR statement must be placed in the definition data set; it cannot
be issued as an operator command.
UNITATTR Usage
UNITATTRs are used to distinguish between devices that are configured as either 3490E
or 3590 device types:
• 3490E-type
- 4490
- 9490
- 9490EE
- SD-3
- 9840
- T9840B
- T9840C
- T9940A
- T9940B.
• 3590-type
- SD-3
- 9840
- T9840B
- T9840C
- T9940A
- T9940B.
Note: SD-3s, 9840s, T9840Bs, T9840Cs, T9940As, and T9940Bs can be defined as
either 3490E or 3590. 3490E-type transports not defined by UNITATTRs are
presumed to be 4490 transports; 3590-type transports are presumed to be 9840
transports.
To allow the HSC to operate correctly, the user must specify UNITATTR statements for all
nonlibrary transport models that appear to the operating system as 3490E-type and
3590-type devices. For library devices, the model type is determined by the LMU. For
newly defined drives, if the LSM has not been online, the model has not been reported by
the LMU. Because of this, StorageTek recommends that UNITATTRs be defined for both
library and nonlibrary devices.
Note: If you change your transport configuration, you may need to edit the definition
data set containing the UNITATTR statements and reload it by issuing the UNITDEF
command.
UNITATTR