In that case, maybe it is time to report a security bug to the Support Center. :(
The description of Write Count, Key, and Data does say that the rest of the track is erased; however, it does not say how effective the erasure is. Apparently, not very. I wonder what XRC is doing to be able to see the rest of the track. The normal CCWs documented in GA32-0099-06 do not appear to be capable of doing it. Maybe what is needed is an obliterating write instead of a formatting write. Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[email protected]] On Behalf Of Marcy Cortes > Sent: Tuesday, February 24, 2009 8:24 PM > To: [email protected] > Subject: Re: Clear_Tdisk question > > Does look like z/OS guys can read stuff off after a > formatting write though. They told me they found addresses > and other such corp properties data with their utility (DSS?) > > So probably not good enough for Alan :) > > But when you have to have more than one o/s eating the same > disk drive, security is always going to be questionable. > z/VM depends on z/OS to do long distance mirroring, at least > with IBM product. Not sure if the other vendors do. > > > Marcy > > > "This message may contain confidential and/or privileged > information. If you are not the addressee or authorized to > receive this for the addressee, you must not use, copy, > disclose, or take any action based on this message or any > information herein. If you have received this message in > error, please advise the sender immediately by reply e-mail > and delete this message. Thank you for your cooperation." > > > > ________________________________ > > From: The IBM z/VM Operating System > [mailto:[email protected]] On Behalf Of Steve Wilkins > Sent: Tuesday, February 24, 2009 3:57 PM > To: [email protected] > Subject: Re: [IBMVM] Clear_Tdisk question > > > > Yes, it is a formatting write. There are no more records on > each track after Record 1. > > Steve Wilkins > z/VM I/O Strategy > IBM VM Development > > Inactive hide details for "Schuh, Richard" ---02/24/2009 > 06:43:06 PM---I presume that it was done as a formatting > write so that"Schuh, Richard" > ---02/24/2009 06:43:06 PM---I presume that it was done as a > formatting write so that there are no > > > > From: > "Schuh, Richard" <[email protected]> > > To: > [email protected] > > Date: > 02/24/2009 06:43 PM > > Subject: > Re: Clear_Tdisk question > ________________________________ > > > > > I presume that it was done as a formatting write so that > there are no more visible fields following record 1. That > would at least be a logical erasure of the rest of the track. > If that satisfies Chuckie, or even if it satisfies Alan, it > is all right with me for them to use the fast erase method. > > Is it possible to not include T-disk space in the remote copy? > > > Regards, > Richard Schuh > > > > > -----Original Message----- > > From: The IBM z/VM Operating System > > [mailto:[email protected]] On Behalf Of Marcy Cortes > > Sent: Tuesday, February 24, 2009 2:08 PM > > To: [email protected] > > Subject: Re: Clear_Tdisk question > > > > Apparently does writes 1 4096 byte record on a detach. > > Onto the next rabbit hole to peak into... > > > > > > Marcy > > > > "This message may contain confidential and/or privileged > > information. If you are not the addressee or authorized to > > receive this for the addressee, you must not use, copy, > > disclose, or take any action based on this message or any > > information herein. If you have received this message in > > error, please advise the sender immediately by reply e-mail > > and delete this message. Thank you for your cooperation." > > > > > > -----Original Message----- > > From: The IBM z/VM Operating System > > [mailto:[email protected]] On Behalf Of Schuh, Richard > > Sent: Tuesday, February 24, 2009 1:33 PM > > To: [email protected] > > Subject: Re: [IBMVM] Clear_Tdisk question > > > > Have you tried to define a T-disk and run DDR to see what had > > been done without formatting the disk? I see where it says > > that binary zeros are written, but it doesn't say how many. I > > suppose it could do a formatting write and just write one > > record of any size. I don't know if that would satisfy the > > statement or intent. > > > > > > Regards, > > Richard Schuh > > > > > > > > > -----Original Message----- > > > From: The IBM z/VM Operating System > > > [mailto:[email protected]] On Behalf Of Marcy Cortes > > > Sent: Tuesday, February 24, 2009 1:04 PM > > > To: [email protected] > > > Subject: Clear_Tdisk question > > > > > > We have XRC choking on a VM tdisk volume. Its mod 3 - > tdisk 1-3338. > > > > > > When clearing Tdisk, does VM write 1 4096 byte record per > > track? XRC > > > support is trying to figure out what's going on. > > > > > > > > > > > > > > > Marcy > > > > > > > > > "This message may contain confidential and/or privileged > > information. > > > If you are not the addressee or authorized to receive > this for the > > > addressee, you must not use, copy, disclose, or take any > > action based > > > on this message or any information herein. If you have > > received this > > > message in error, please advise the sender immediately by > > reply e-mail > > > > > and delete this message. Thank you for your cooperation." > > > > > >
