Oh, I'm not too sure how well z/OS will tolerate a "read only" disk. I
remember doing it long ago with MVS 3.8j and VM/370. I'd get some
strange I/O errors at times.
Even when you open a dataset for just INPUT, OPEN may want to rewrite
the F1 DSCB to update the last reference date if is not already set to
today. This will fail if the disk is read/only.
However, IBMLINK finds some APARS from 1982 (OZ56722, OZ60158, OZ63205)
which modified O/C/E to be tolerant of a "write inhibit" error on the
DSCB if opening the dataset for INPUT. The APARs mention VM but us
oldtimers remember that 3330s and 3350s had a switch to put the disk
into read/only mode. Unless IBM has regressed those changes in the
last 20 years, VM volumes in R/O mode should work.
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: [EMAIL PROTECTED]
sales info: [EMAIL PROTECTED]
tech support: [EMAIL PROTECTED]
web: www.innovationdp.fdr.com
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