RE: Dynam/T definition and associated ASIPROC entry

Max Singley

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Apr 27, 2016, 8:16:40 AM4/27/16

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I’m not sure what the DYNAM-T recommendations are, but we run DYNAM-T with 7F0-7F4 defined as the dummy entries and have never had any kind of issue.

Have fun,
Max E. Singley
Technical Services Project Leader
Alex Lee, Inc.
Email: max.s...@alexlee.com Tel: 828-725-4894
A responsive and reliable production environment doesn't just happen by accident.

From: VSE-L [mailto:vse-l-bounces+max.singley=alexl...@lists.lehigh.edu] On Behalf Of Allan Peterson
Sent: Tuesday, April 26, 2016 7:13 PM
To: VSE Discussion List <vs...@lehigh.edu>
Subject: Dynam/T definition and associated ASIPROC entry

I would like to review this entry in my ASIProc, as to why there are there are 16 of these when I only have 8 device defined for actual tape drives
If I removed 4 of the dud drives from the ASIProc according to sypubcnt latest run that would give me 242 CUU’s in use and thus I could allow for 8 drives for the VTL
If I could reduce the # of Dynam/T dummy drives I could use that to for the 2216 or more disk

ADD 7F0:7FF,3490E,DVCDN                DUMMY TAPE UNITS (DYNAM/T)

From the Dynam definition options I have
// EXEC CACCDBU0,SIZE=1M                                                 000055
ALTER DTOPTIONS CPU(*) REFRESH(YES) -                                    000056
DUMMY(7F0,7FF)                    -                                      000057

Thoughts appreciated.

Allan

Allan Peterson
Telco Administrator
DDI: +6494428615 | Mobile: +6421750529 | Fax: +6494428601
Email: Allan.P...@revera.co.nz | Web: www.revera.co.nz:



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Dieltiens Geert via VSE-L

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Apr 27, 2016, 8:51:26 AM4/27/16

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IIRC, you only need these dummy devices if you use the TDYNASN "ASSGN SYSnnn,DUMMY" feature.
Unless you do a lot of parallel "dummy" tape-processing, 7F0-7F4 should be sufficient.

Also, we use 7F5 as dummy device for POFFLOAD backup/restore to Dynam/T controlled tapes.
// EXEC CACCDBU0
ALT DTOPTIONS CPU(*) PWRCUU(7F5) REFRESH(YES)
/*

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Frank M. Ramaekers

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Apr 27, 2016, 9:14:49 AM4/27/16

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I think it's important to tell us how many "real" tape drives you have (to show the ration of dummy to real).

Frank M. Ramaekers Jr.

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From: VSE-L [mailto:vse-l-bounces+framaekers=ailif...@lists.lehigh.edu] On Behalf Of Max Singley
Sent: Wednesday, April 27, 2016 7:16 AM
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daniel....@skynet.be

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Apr 27, 2016, 2:54:51 PM4/27/16

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Hello Allan,

Follow the good advice from my old friend Geert! He did answerd exactly
what is right.
All the best to you all! ... and particularly to Geert.
Daniel

Daniel de Viron
Independant consultant z/VM and z/VSE
Rue haute 42
1435 Corbais
Belgium
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Allan Peterson

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Apr 27, 2016, 3:17:02 PM4/27/16

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If everything was working as it should be 8 real drives ,but, at the moment only 3.
Hence the having a look at VTL

Dieltiens Geert via VSE-L

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Apr 28, 2016, 2:39:09 AM4/28/16

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Yo Daniel, thanks! All the best to you as well...

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From: VSE-L [mailto:vse-l-bounces+geert.dieltiens=inf.van...@lists.lehigh.edu] On Behalf Of daniel....@skynet.be
Sent: woensdag 27 april 2016 20:55
To: vs...@lists.lehigh.edu
Subject: Dynam/T definition and associated ASIPROC entry

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daniel....@skynet.be

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Apr 28, 2016, 2:36:31 PM4/28/16

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Hello Allan,
As Geert noted in his reply, the number of virtual devices have no relation
with the number of real devices.
The number of virtual devices has to be high enough to fullfill the number
of concurrent EXEC TDYNASN ... ASSGN SYSxxx,DUMMY. If you have maximum 2
concurrent TDYNASN with 1 ASSGN SYSxxx,DUMMY 2 dummy device would be
enough. But with experience, it show that having 5 dummy devices (by
default 7F0:7F4) would be sufficient in all cases. In nearly 27 years
supporting CA DYNAM I alwais did use this address and never encountered any
probem.

Regards,