RE: Mount DASD as read-only



In the *OLD*, *OLD* days, the 1311(1401/1441/1460-series machines), 2311 AND
the 2314 disk drives had a read-only switch. For operators, it was a great
way to get rid of a nuisance programmer by convincing him he had a problem
with his program's logic since it would cough-up a very cryptic error
message. Usually worked once per programmer.

Kent

Kent Ramsay
Senior System Programmer, SRDC
P 425.564.9735 | F 425.564.9701
www.webMethods.com

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxxx
Of Ed Gould
Sent: Sunday, February 19, 2006 11:17 AM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: Mount DASD as read-only

On Feb 19, 2006, at 12:00 AM, Ted MacNEIL wrote:

I remember, in the ancient past, that there was a switch on the
device to make
it read-only.

How do you physically make a logical device that is spread over
umpteen volumes read-only?
You would need a switch for each cylinder/track on each disk.


Ted:

This was in the *OLD* days when each drive had its own enclosure (although
the 2314's might have had them as well).

It been ages but IIRC the 3350's and maybe the 3330's they were there as
every once in a while one would get turned on in error. This was before
(IIRC) the VTOX date/time stamp was available.

Ed

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