You can always READ without any risk of corrupting data, so if you know that
data is being update only from say ONLY one sysplex, the risk of corruption
should be minimal. Just time when you read the data to ensure you get the
'latest' version.
There is an exposure even if you only do updates from one system,
although it is small.
In the VTOC, a DSCB may be rewritten to update the "last reference date"
even for a dataset opened only for INPUT.
If the same dataset was opened for OUTPUT on the updating system, and
needs to update fields in the DSCB (such as the last block pointer),
these rewrites may collide and the update from the system open for
OUTPUT may get lost. Later, if the dataset is opened for output again,
the original updates may be overlaid. This can also affect backup
programs.
--
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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