StorageTek Host Software Component 6.0, Руководство системного программиста

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Chapter 3. HSC Control Statements and HSC Start Procedure 87
1st ed., 6/30/04 - 312579601
CDS Definition (CDSDEF) Control Statement
The CDSDEF control statement is required and provides static information to the HSC.
This information is used by the HSC at initialization and remains for the life of the HSC
execution. The primary, secondary, and standby control data sets are dynamically
allocated. The CDSDEF PARMLIB control statement defines which copies of the control
data set are used while the HSC is running.
Information used to build the SVC99 parameter lists is acquired from the parameter data
set.
If journaling is active, JRNDEF statements must be used (refer to “Journal Definition
(JRNDEF) Control Statement” on page 92 for more information).
Control information provided to the HSC by CDSDEF includes:
• the name(s) for HSC control data set(s)
• the DASD volume where the specified CDS resides
• the unitname for the SVC99 parameter list for CDS allocation
• switch information controlling the enabling of a standby CDS.
Notes:
• The number of CDS copies used by the HSC is dependent on the number of CDS
copies defined in the CDSDEF PARMLIB control statement. Control and journal
data sets may not be defined in SLKJCL; the CDSDEF statement must be in the
PARMLIB definitions. It is not determined by the LIBGEN SLIRCVRY macro
TCHNIQE parameter.
• The HSC uses all of the CDS copies defined in the CDSDEF control statement
(whether this includes more or less CDS copies than are specified by the TCHNIQE
parameter). However, if journaling is specified by the TCHNIQE parameter, journals
must be defined for successful HSC initialization.
Caution: Parameters specified for the CDS definition cannot be changed without a
complete restart of the HSC on all hosts.
Syntax
CDSDEF DSN1( dataset.name )
,VOL1( volser ),UNIT1( unitname )
,DSN2( dataset.name )
,VOL2( volser ),UNIT2( unitname )
,DSN2( dataset.name )
,VOL3( volser ),UNIT3( unitname ) ,DISABLE
CDSDEF