StorageTek Host Software Component 6 User Manual

1st ed., 6/30/04 - 312579601

A number of HSC facilities and techniques are provided that customers can employ to 
avoid outages and make changes less disruptive to their library hardware and HSC 
environment. 

This section discusses the following topics: 

• using multiple CDS copies 
• automatic recognition of configuration changes 
• using the SET utility instead of LIBGEN and reconfiguration
• defining a new configuration to avoid future reconfigurations 
• defining planned ACSs with no stations  
• changing panels
• using CDS rename/relocate/expand. 

In addition, several other timesaving benefits are described in other places in the HSC 
documentation set. These are: 

• converting the CDS level from 2.0 to 2.1 while HSC 2.0.1 remains active. Refer to 

the HSC Installation Guide, ‘‘CDS Conversion Requirements (Up-Level 
Migration),’’ in Appendix D, ‘‘Migration and Coexistence Processes.’’

• resolving LSM and panel type configuration mismatches. Refer to either the HSC 

Installation Guide, ‘‘Configuration Mismatches,’’ in Chapter 8, ‘‘HSC Initialization’’ 
or see the HSC System Programmer’s Guide,  “Configuration Mismatches” on page 
163

• changing drive panel types without running a reconfiguration. Refer to the HSC 

System Programmer’s Guide, “SET Device Numbers for Drives” on page 405.

• automatic internal cold start for HSC 2.0.1 and later releases. Refer to either the

 

Installation Guide, ‘‘Starting HSC Execution’’ in Chapter 7, ‘‘Initializing the HSC’’

 

or see the HSC System Programmer’s Guide, “Starting HSC Execution” on page 225

.

• suppressing the ‘‘ACS Disconnected’’ message to allow for future hardware 

expansion. Refer to the HSC Operator’s Guide, ‘‘OPTION Command and Control 
Statement,’’ in Chapter 2, ‘‘Commands, Control Statements, and Utilities.’’ 

When multiple copies of the CDS are defined and enabled, the HSC automatically 
recovers from errors on one of these copies. In a multiple-host environment, CDS 
recovery is coordinated among the HSCs on all hosts. 

• When there is a mismatch between information on the same block on the primary and 

secondary CDS copy, the HSC automatically selects the most recent copy. When the 
CDS is updated, the modified block is written to both the primary and secondary 
CDS copies.  

• If a secondary CDS copy is active, and a failure occurs in accessing the current 

primary CDS copy, the HSC automatically makes the secondary CDS copy the