On Tue, 2008-04-08 at 09:38 +0800, Jason To wrote:
> David, how did you code your ACS routine to select different storage
> classes? Can you send me a sample? TIA.
Rather than mail it to you I'll post it. Maybe someone else will see
something *I've* done wrong.
Our DC routine assigns a DATACLAS of 'SMSEXT' if we want the dataset to
be system-managed and extended-format (pretty much the default
condition), and 'SMSCOMP' if we additionally want the dataset to be
compressed (assigned on a special case basis).
The SC routine selects a storage class based on the DATACLAS name and
the dataset's &SIZE. Here's an extract:
FILTLIST EXTCLASS INCLUDE('SMSCOMP','SMSEXT')
/*
* IF THE DATA CLASS IS EXTENDED FORMAT, THEN CHOOSE
* A STORAGE CLASS BASED ON THE DATASET SIZE.
*
* THE EXTENDED FORMAT STORAGE CLASSES DIFFER FROM EACH
* OTHER ONLY BY THEIR "SUSTAINED DATA RATE" SPECIFICATIONS.
* THESE ARE WHAT DRIVE THE SMS STRIPING DECISION -- YOU
* GET ONE STRIPE FOR EVERY 4MB/SEC.
*/
IF (&DATACLAS = &EXTCLASS) && (&DSORG = 'PS') THEN DO
SELECT
WHEN (&SIZE > 256MB) SET &STORCLAS = 'STRIPED8'
WHEN (&SIZE > 128MB) SET &STORCLAS = 'STRIPED4'
WHEN (&SIZE > 64MB) SET &STORCLAS = 'STRIPED2'
OTHERWISE SET &STORCLAS = 'MANAGED'
END
EXIT
END
The STRIPED(2/4/8) storage classes are defined with SUSTAINED DATA RATES
of 8/16/32.
The number of stripes I assign versus the dataset size was arbitrary. I
have eight ESCON paths to my Iceberg, so that's the max stripe count I
ever set.
--
David Andrews
A. Duda and Sons, Inc.
[EMAIL PROTECTED]
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