VSAM ⭐ Featured
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Q: What is STORAGECLASS?

Answer:
SMS STORAGECLASS for VSAM placement. STORCLAS on DEFINE. Controls performance, availability. ACS routines may assign. Modern storage management. Replaces explicit volume specifications.
storageclass sms placement
JCL
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Q: Explain SMS-managed storage

Answer:
SMS (Storage Management Subsystem) manages dataset placement. Specify STORCLAS, MGMTCLAS, DATACLAS in DD. DATACLAS sets DCB attributes, STORCLAS controls placement, MGMTCLAS defines retention. SMS uses ACS routines for assignment.
sms storage management
JCL
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Q: What is VOL parameter?

Answer:
VOL specifies volume. VOL=SER=PACK01 specific volume. VOL=REF=*.STEP.DD copies volume from previous. VOL=(,RETAIN) keeps volume mounted. VOL=(,,,5) allows 5 volumes. SER overrides SMS placement. Use cautiously.
vol volume serial
JCL
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Q: Explain STORCLAS parameter?

Answer:
STORCLAS assigns SMS storage class. STORCLAS=classname. Determines placement, management, backup. ACS routines may assign. Defines performance characteristics. Installation-defined classes.
storclas sms storage