Rez,
Do you have a analysis of what Compression cost/dsn?
Regards,
Tobias Cafiero
Data Resource Management
Tel: (212) 855-1117
R Hey <[email protected]>
Sent by: IBM Mainframe Discussion List <[email protected]>
02/24/2010 03:16 AM
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Re: SMS compression cost & size
Ron,
Your example is an 'exception', it was decided to do it for that DS to
gain the
benefit. That's OK by me.
It wasn't decided to COMP all VSAM/PS(FB/VB) DS that are over 5 CYL, which
is the case I question. I've seen thousands of GDS, under 5 Cyl, being
COMP'd, & they quickly go to ML2, so they are not read many times. This
doesn't make sense to me, if one is short on CPU.
I should have said:
I don't see why anyone would compress ALL DS under 500 Cyl these days,
just to save space, when one is short on CPU.
> there is more to compression than just the size of the dataset.
Amen.
Rgds,
Rez
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