StorageTek Host Software Component 6 User Manual

1st ed., 6/30/04 - 312579601

UNITATTR statements describe the recording technique attributes of library and 
nonlibrary transports. Transports are described by: 

• unit address 
• transport model number. 

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.  
Refer to “Unit Attribute (UNITATTR) Control Statement” on page 136 for more 
information.

Collections of transports with common characteristics can be identified with a single 
UNITATTR statement by specifying a list of unit addresses, range of addresses, or 
multiple ranges of addresses. 

The UNITDEF command causes the HSC to open the definition data set containing the 
UNITATTR statements. See “Unit Attribute Definition (UNITDEF) Command and 
Control Statement” on page 140 and “Unit Attribute (UNITATTR) Control Statement” on 
page 136 for descriptions of syntax and parameters. 

VOLATTR statements describe the media type and recording technique attributes of 
cartridge tape volumes. 

Volumes are described by:

• volume serial number (VOLSER) 
• media type 
• recording technique. 

To allow the HSC to operate correctly, the user must define VOLATTR statements 
for all ECART, ZCART, helical, 9840/T9840B (STK1), and T9940A media. Volumes 
not defined by VOLATTRs are presumed to be standard capacity cartridges. 

Note: Alternatives to defining VOLATTR statements are available. Refer to “Volume 
Attribute (VOLATTR) Control Statement” on page 143 for more information. 

Collections of cartridges with common attributes can be identified in a single VOLATTR 
statement by specifying ranges and lists of VOLSERs, or using wild card characters. 

Scratch counts are based entirely on VOLATTR information. Accurately defined 
VOLATTR control statements are critical for correct processing of nonspecific 
volume requests.