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Date:         Wed, 10 Mar 1999 09:13:25 -0500
Reply-To:     RAITHEM <RAITHEM@WESTAT.COM>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         RAITHEM <RAITHEM@WESTAT.COM>
Subject:      Re: Inquiry on mvs
Comments: To: WIELKI ANDRE <andre.wielki@INSEE.FR>
Content-Type: text/plain; charset=US-ASCII

Andre Wielki posted the following:

>In our organization, there is a discussion about the size by default we >must put for the saswork on mvs with disks 3390. I think most of you will >be curious to know the usage of the length for the sas609 version > in the others mvs places. If the users send to me the information, i >promise to make a little tabulate on the answers. The information needed >are type of disk , some indication about the datasets (many little, big >one , large or narrow observations) and lrecl and blocksize of your sas >609 call procedure (6144 , 27648 or other). > >In a second time, one of the specialist in mvs (Raithel for example and >others) will make comments on the results in term of performances. >

Bonjours, Andre! I would definitely like to participate in your survey. For my part, I always block the SAS Work data set, on 3390 DASD, at 27648 bytes. This ensures that I get two physical blocks per track and that I am using 98.8% of the track area. (This is wildly opposed to the 6144-byte block size that puts 8 physical blocks on each track and uses 92% of the track area). I use the 27648 block size for both my batch and my interactive SAS tasks.

Good luck in your survey; I will look forward to reading the results!

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Michael A. Raithel "The man who wrote the book on performance." E-mail: raithem@westat.com Author: Tuning SAS Applications in the MVS Environment +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ...everywhere you go you see them searching; everywhere you go you feel their pain; everyone is looking for the answer; well, look again... ---The Moody Blues +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


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