Correct. When formatting your storage device, you can't format a full number of 
the same size. 

In fact, we formatted a large amount of model 54's(?) with 57 GB, a number of 
model 12 GB's for data that will never be able to fill a model 57 and formatted 
the remaining space with model 9's, 3' and 1's. in fact, IIRC, all volumes must 
be a multiple of 1111 cyls, a 3390 model 1.

Maybe if you really demand all volumes to be equal size, you could probably 
format them as model 51's or so.

It is all transparent to the system.

Regards,
Kees.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of Gonzalo Cengotita
Sent: 21 January, 2015 15:51
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: DASD Model-27 & 54 implementation

Hi,
I think there are not special considerations with model 27 or model 54.
Those dasd are just 3390-9 devices with a bigger size.

Regards,

Gonzalo Cengotita

2015-01-21 12:23 GMT+01:00 Buckton, T. (Theo) <the...@nedbank.co.za>:

> Hi,
>
> Please refer me to documents containing notes on implementing dasd 3390
> model27 & 54  - considerations and configuring DFSMS.
> We are running z/OS 2.1
>
> Regards
>
>
>
>
>
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-- 

*Gonzalo Cengotita*

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