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 600 Gemini Avenue Mail Code USH-4A3L Houston, Texas 77058 Voice: (281) 282-2975 Page: (713) 736-8275 Fax: (281) 282-3583 E-Mail: [EMAIL PROTECTED] All opinions expressed by me are mine and may not agree with my employer or any person, company, or thing, living or dead, on or near this or any other planet, moon, asteroid, or other spatial object, natural or manufactured, since the beginning of time. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] Behalf Of Ed Gould Sent: Sunday, February 19, 2006 1:17 PM To: [email protected] 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
