Posts related to storage on mainframe
A Virtual Tape Library (VTL) is a disk (DASD) based backup system that emulates a real tape library system. For the operating system and to those who use the VTL, it’s like working with real tapes, but in reality it’s disk. A Virtual Tape Library has several benefits: Better backup/restore […]
What exactly is an EXIT in z/OS? An EXIT is nothing more than a subroutine invoked by a program that can be customised to implement a predefined event in the execution of that same program. Confused? In that case imagine an EXIT as a way to customise the execution of […]
The following table lists some of the most common MVS system address spaces: Adress Space Description ANTAS000 Concurrent Copy Support ANTMAIN Concurrent Copy support BPXOINIT USS Address Space initiators CATALOG Catalog Address Space – Handles DISP=SHR, DISP=OLD, and DISP=(…,CATLG) CONSOLE Console Task – operator’s interface DLF Data Look aside Facility […]
The following table describes the DFSMShsm user commands that can be used for storage administration: Command Description HALTERDS HAL Changes the data set parameters that affect backup. This command only applies to NON-SMS managed datasets. Syntax: HALTERDS (dsname/password…) FREQUENCY(days) or SYSFREQUENCY VERSIONS(limit) or SYSVERSIONS Examples: HALTERDS PARTSTST.CNTL VERSIONS(13) FREQUENCY(999) HALTERDS […]
The following JCL will delete the content of a sequential dataset without deleting it using the IDCAMS utility: //DELCONT EXEC PGM=IDCAMS //DDDMMY DD DUMMY //DDOUT DD DISP=SHR,DSN=USER1.MYDATA.EXAMPLE //SYSPRINT DD SYSOUT=* //SYSOUT DD SYSOUT=* //SYSIN DD * REPRO IFILE(DDDMMY) OFILE(DDOUT) Replace USER1.MYDATA.EXAMPLE by the sequential dataset you wish to delete […]
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