RE: Mount DASD as read-only

I remember when the cleaning crew flipped one on a 3350, which is the last device I remember having the switch.
Took several hours to determine what had happened due to the midnight phenomenon.

Dennis Roach
United Space Alliance
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-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxxx
Behalf Of Ed Gould
Sent: Sunday, February 19, 2006 1:17 PM
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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