StorageTek Host Software Component 6 User Manual

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

The JRNDEF control statement provides static information to the HSC. This information 
is used by the HSC at initialization and remains for the life of the HSC execution. Control 
information provided to the HSC by JRNDEF includes: 

• the name for HSC journal data sets 

Note: If your recovery technique involves using journals, both journal data sets are 
required. HSC will not initialize if only one journal data set is provided. 

• the DASD volume where the specified journal resides 

• the unitname for the dynamic allocation parameter list for journal allocation 

• journal full options. 

In a multi-host complex, a separate JRNDEF statement is required for each host. Refer to 
“CDS Definition (CDSDEF) Control Statement” on page 87 for information about 
defining CDS files. 

JRNDEF initiates the control statement. 

dataset.name is the name of an HSC journal data set. If journaling is active, each 
HSC host that comes active must find a JRNDEF statement in PARMLIB with a 
HOSTID that matches the system where it is running. Each JRNDEF statement must 
specify two distinct journal DSNs. 

Journal data sets cannot be shared between hosts. 

optionally, volser is the volume serial number of the DASD volume where the 
specified journal resides. The VOL parameter must be specified in VM.