Hi List,

I have a FlashCopy question about withdrawing FC relationships.  To set
the stage, I have a DMX-4 and a DS6800 in my environment.  Every night I
run a job that does FlashCopy full volume copies of all my volumes to a
complete set of target volumes using copy commands like this:

COPY FULL IDD(ZOSCAT) ODD(SNPCAT) FR(REQ) FCNC DUMPCOND PURGE

This is followed by DUMPing the SNP volumes to tape using DFDSS and this
syntax:

DUMP INDDNAME(DASD1) OUTDD(TAPE1,TAPE1D) ALLD(*) ALLX OPT(4)

Then the following night, I run a job immediately before my FlashCopy
job to break the FC relationships, using a sequence of:

FCWITHDR SDEVN(1100) TDEVN(1240)    /* ZOSCAT */   

The reference manual says 

"If you use the FCNOCOPY keyword, you must withdraw the FlashCopy
relationship when the copy is no longer needed to free up the subsystem
resources that maintain the FlashCopy relationship. You can withdraw the
FlashCopy relationship by performing one of the following tasks:  
Initiate a dump of the target of the copy and specify the FCWITHDRAW
keyword on the DUMP command
Initiate the TSO FCWITHDR command."

Here's my question:  If I skip the FCWITHDR step, does the system do an
implicit FCWITHDR when I run the COPY command against the same set of
source/target volumes the next night?  My question comes about because
we are in the process of migrating volumes from the DS6800 to the DMX
and the FCWITHDR job hasn't been kept current.  The COPY steps run just
fine and I'm getting good backups, but I just don't know if there are
some internal resources within either the DMX or the DS6800 that aren't
being freed.

TIA

Rex


PS, I don't want to add the FCWITHDRAW keyword to the DSS DUMP job
because I can use the FC target for doing dataset level restores the
next day in case somebody inadvertently clobbers a dataset.  Much faster
tan getting the tapes back from offsite.

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