There are still some minor issues involved w/vvds, etc. placement, but there 
are very moinr, and for most volumes will make zero difference.

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Pommier, Rex
Sent: Monday, July 6, 2020 10:18 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: [External] Re: Vtoc and index sizing based on Mods

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Hi Peter,

I don't think anybody answered this question.  With modern (read: emulated) 
boxes I've been told the location of the VTOC/VTOCIX/VVDS don't matter anymore. 
 Back in the SLED days I was a stickler for placing the VTOC & IX  1/3 of the 
way into the volume, right next to each other to try to minimize head movement. 
 Now, with it all placed on "smoke and mirrors", and with huge cache sizes, the 
location doesn't matter, so I place them right at the beginning of the volumes 
so that I have the largest possible contiguous free space - at least until the 
first dataset on the volume is deleted.  :-)

Rex

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Peter
Sent: Saturday, July 4, 2020 11:22 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: [External] Re: Vtoc and index sizing based on Mods

Hello

Thank you so much

How do we determine the location of vtoc and index ?  Is it possible to place 
all the mod 27 in same location of cylinder and tracks ?

On Sat, 4 Jul, 2020, 9:44 PM Lizette Koehler, <stars...@mindspring.com>
wrote:

> It depends
>
> If the volume would have one dataset on it, like my SPOOL Volumes,
> then they are very small
>
> If like in my TSO Pool there are lots of tiny (15 track or less) then
> I make them huge.
>
> So it all depends on
>
> What the intent of the volume is (1 dataset vs Many Datasets) What
> size the volume is (Mod3/9/27/54/EAV)
>
> You will see an error message when the VTOC or VTOIX is too small.
>
>
>
> Hope this helps
>
> Lizette
>
>
> -----Original Message-----
> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On
> Behalf Of Peter
> Sent: Saturday, July 4, 2020 10:12 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Vtoc and index sizing based on Mods
>
> Hello Group
>
> Apology for being ignorant.
>
> Is there a formula or any constraints for initialising a specific dasd
> Mod ?
>
> How do arrive to a specific vtoc and index value while initialising a
> dasd ?
>
> Please help me to understand
>
> Peter
>
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