In short words, there is no black magic here, it is regular VSAM KSDS cluster, so any method to reorganize it is OK. I don't like your job because of irrational CONDs and disputable LISTCATs (why ?)

In general:
1. Check your clusters using LISTCAT and/or EXAMINE if you want, but definitely review the output before next step or just skip this step. 2. Do a backup, of course "manual backup", do not use HSM. It can be REPRO, EXPORT, or dss DUMP/COPY RENAMEU or whatever. 2.1 Make sure, your backup is valid. You are allowed to do another backup, using other method. You are not allowed to proceed if you are unsure about backup... 3. Delete CDS (and recreate it) and copy data from the backup to new empty dataset.
4. Have  a beer...

BTW: it is good idea to review CDS parameters, especially space allocation.
BTW2: For the step 2 I would consider REPRO OFILE(OUT) with //OUT DD DISP=(,CATLG),LIKE=INPUT.FILE

HTH

--
Radoslaw Skorupka
Lodz, Poland







W dniu 2017-03-29 o 16:43, John Dawes pisze:
G'Day,

I am setting up a reorg job to reorganise the MCDS/BCDS/OCDS because they have 
reached the threshold of 95%.
I checked the doc IBM z/OS DFSMShsm Primer for an example.  I noticed that in 
the IMPORT step it is using parm IEMPTY:
IMPORT IDS(?UID.EXPORT.MCDS) ODS(?UID.MCDS) IEMPTY  because the cluster is 
being redefined.  Would it be a problem if I was not deleting the cluster and 
performed the IMPORT using the IEMPTY parm?
I have run a test with the IEMPTY parm and without and they both work.  My 
question is do I need to use the IEMPTY parm?
I read in the doc z/OS V1R9.0 DFSMShsm Storage Administration Guide that the 
IMPORT function redefines a VSAM data set by using a copy of the catalog 
information saved in the EXPORT copy of the data set

Here is my jcl:
//STEP1    EXEC PGM=IDCAMS,COND=(0,NE)
//SYSPRINT DD  SYSOUT=*
//SYSIN   DD   *
  LISTC ENT(SYS2.MCDS) ALL
/*
//STEP2   EXEC PGM=IEFBR14,COND=(0,NE)
//MCDS    DD DSNAME=SYS2.MCDS.BKUP,UNIT=SYSALLDA,
//        DISP=(,CATLG,DELETE),SPACE=(CYL,(250,200))
/*
//STEP3   EXEC PGM=IDCAMS,COND=(0,NE,STEP4)
//SYSPRINT DD  SYSOUT=*
//SYSIN   DD   *
   EXPORT SYS2.MCDS ODS(SYS2.MCDS.BKUP) TEMPORARY
/*
//STEP4   EXEC PGM=IDCAMS,COND=(0,NE)
//SYSPRINT DD  SYSOUT=*
//SYSIN   DD   *
   IMPORT IDS(SYS2.MCDS.BKUP) ODS(SYS2.MCDS) IEMPTY
/*
//STEP5     EXEC PGM=IDCAMS,COND=(0,NE)
//SYSPRINT DD  SYSOUT=*
//SYSIN   DD   *
  LISTC ENT(SYS2.MCDS) ALL
/*

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