Re: How to get a tape's DSCB

2012-10-04 Thread Anne & Lynn Wheeler
shmuel+...@patriot.net (Shmuel Metz , Seymour J.) writes: > No! The channel should pass CCW opcodes[1] on to the controller and > let the controller handle them. > > [1] Other than TIC. note that more recent zHPF for FICON with TCW ... batch up multiple channel commands for download. this is simi

Re: How to get a tape's DSCB

2012-10-04 Thread Shmuel Metz (Seymour J.)
In <77142d37c0c3c34da0d7b1da7d7ca343722f8...@nwt-s-mbx1.rocketsoftware.com>, on 10/03/2012 at 04:01 PM, Bill Fairchild said: >It does need to be done for DASD. No; something different needs to be done. >It is all handled by CCW prefixing. FSVI "it"; CCW prefixing is not a means of scannin

Re: How to get a tape's DSCB

2012-10-04 Thread Shmuel Metz (Seymour J.)
In , on 10/03/2012 at 10:37 AM, J R said: >Rather than IOS, the channel should do the checking. No! The channel should pass CCW opcodes[1] on to the controller and let the controller handle them. [1] Other than TIC. -- Shmuel (Seymour J.) Metz, SysProg and JOAT Atid/2

Re: How to get a tape's DSCB

2012-10-04 Thread Shmuel Metz (Seymour J.)
In <0f2549fd-fa84-4602-9164-d30466d42...@aim.com>, on 10/03/2012 at 08:35 AM, Paul Gilmartin said: >On Oct 3, 2012, at 08:15, McKown, John wrote: >> It would be very difficult and have a lot of overhead to have IOS (not iOS) >> check every CCW chain for "suspect" CCWs. ... >> >Doesn't that

Re: How to get a tape's DSCB

2012-10-03 Thread Jonathan Goossen
> Will that stunt works with VTS? I mean, since VTS is supposed to > *emulate* tapes (34980/3490/Magstar/etc), in theory you could do > that little trick. Possibe or not? What will those hardware do when > receiving such a CCW? It will not work with either of the two VTS systems that I have us

Re: How to get a tape's DSCB

2012-10-03 Thread Elardus Engelbrecht
Jonathan Goossen wrote: >> we ran into a company that had modified the 3490 microcode to read data that >> existed after the tapemark at the end of the overwriting data. Sounds messy, but, luckily, this is not my machine... ;-) >There are at least two software vendors that sell products that re

Re: How to get a tape's DSCB

2012-10-03 Thread Bill Fairchild
f Of Paul Gilmartin Sent: Wednesday, October 03, 2012 9:36 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How to get a tape's DSCB On Oct 3, 2012, at 08:15, McKown, John wrote: > It would be very difficult and have a lot of overhead to have IOS (not iOS) > check every CCW chain fo

Re: How to get a tape's DSCB

2012-10-03 Thread J R
direction could be cause for concern. > Date: Wed, 3 Oct 2012 16:43:16 +0200 > From: kees.verno...@klm.com > Subject: Re: How to get a tape's DSCB > To: IBM-MAIN@LISTSERV.UA.EDU > > With rewinding you mean: forward skipping? AFAIK this is prevented by > the ha

Re: How to get a tape's DSCB

2012-10-03 Thread Jonathan Goossen
> With rewinding you mean: forward skipping? AFAIK this is prevented by > the hardware and not overrable by software. Investigating the > recoverability of overwritten data on tapes in the past, we ran into a > company that had modified the 3490 microcode to read data that existed > after the tapem

Re: How to get a tape's DSCB

2012-10-03 Thread Vernooij, CP - SPLXM
prevent rewinding over tape marks. > > > > Date: Wed, 3 Oct 2012 09:15:50 -0500 > > From: john.mck...@healthmarkets.com > > Subject: Re: How to get a tape's DSCB > > To: IBM-MAIN@LISTSERV.UA.EDU > > > > It would be very difficult and have a lot of

Re: How to get a tape's DSCB

2012-10-03 Thread J R
0 > From: john.mck...@healthmarkets.com > Subject: Re: How to get a tape's DSCB > To: IBM-MAIN@LISTSERV.UA.EDU > > It would be very difficult and have a lot of overhead to have IOS (not iOS) > check every CCW chain for "suspect" CCWs. It is given as one of the reasons

Re: How to get a tape's DSCB

2012-10-03 Thread Paul Gilmartin
On Oct 3, 2012, at 08:15, McKown, John wrote: > It would be very difficult and have a lot of overhead to have IOS (not iOS) > check every CCW chain for "suspect" CCWs. ... > Doesn't that need to be done anyway for DASD channel programs? Or is that all handled by CCW prefixing? -- gil ---

Re: How to get a tape's DSCB

2012-10-03 Thread McKown, John
03, 2012 9:09 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: How to get a tape's DSCB > > On Wed, 3 Oct 2012 07:55:44 -0500, McKown, John wrote: > > >And, just to be complete, you are assuming that your customers will be > using IBM standard tape labels. Granted, who

Re: How to get a tape's DSCB

2012-10-03 Thread Paul Gilmartin
On Wed, 3 Oct 2012 07:55:44 -0500, McKown, John wrote: >And, just to be complete, you are assuming that your customers will be using >IBM standard tape labels. Granted, who doesn't? But it is an assumption. Also, >remember that in many shops, use of BLP to read the tape labels can be >protected

Re: How to get a tape's DSCB

2012-10-03 Thread Paul Gilmartin
On Wed, 3 Oct 2012 02:51:43 -0700, Lizette Koehler wrote: > >If this is something to be executed under TSO, Most shops do not allow for >the TSO User Address space to have MOUNT authority which is needed for a >tape to be allocated to a TSO session. That attribute is contained in the >TSO Segment

Re: How to get a tape's DSCB

2012-10-03 Thread J R
lm.com > Subject: Re: How to get a tape's DSCB > To: IBM-MAIN@LISTSERV.UA.EDU > > And on top of that: you cannot rely on installations allowing TSO users > to have the Mount attribute. With a limited number of physical tape > units, you don't want a couple of T

Re: How to get a tape's DSCB

2012-10-03 Thread Vernooij, CP - SPLXM
IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > > On Behalf Of Robin Atwood > > Sent: Wednesday, October 03, 2012 1:53 AM > > To: IBM-MAIN@LISTSERV.UA.EDU > > Subject: Re: How to get a tape's DSCB > > > > >You could also write a program

Re: How to get a tape's DSCB

2012-10-03 Thread McKown, John
A.EDU] > On Behalf Of Robin Atwood > Sent: Wednesday, October 03, 2012 1:53 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: How to get a tape's DSCB > > >You could also write a program to OPEN a tape dataset for input and > examine the DCB >parameters merged into yo

Re: How to get a tape's DSCB

2012-10-03 Thread Lizette Koehler
> -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf > Of Robin Atwood > Sent: Tuesday, October 02, 2012 11:53 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: How to get a tape's DSCB > > >You could also write a program

Re: How to get a tape's DSCB

2012-10-02 Thread Robin Atwood
>You could also write a program to OPEN a tape dataset for input and examine >the DCB >parameters merged into your DCB. Thanks to everyone who replied. Since this may form part of a product shipped to customers, I can't make any assumptions whether they have rmm or CA-1 installed. Therefore ope

Re: How to get a tape's DSCB

2012-10-02 Thread Robert A. Rosenberg
At 09:12 -0500 on 10/02/2012, Paul Gilmartin wrote about Re: How to get a tape's DSCB: On Tue, 2 Oct 2012 07:19:16 -0400, J R wrote: The DSCB (and OBTAINing it) is a DASD construct. For the equivalent with tape you have to read sequentially looking for labels.   Which, in turn, req

Re: How to get a tape's DSCB

2012-10-02 Thread Shmuel Metz (Seymour J.)
In , on 10/02/2012 at 10:14 AM, Robin Atwood said: >Subject: How to get a tape's DSCB There is none. A DSCB is an entry in a VTOC on DASD. >But of course, the tape *is* mounted. There is no "of course'; the fact that you can mount the volume at a later point in time

Re: How to get a tape's DSCB

2012-10-02 Thread Paul Gilmartin
On Tue, 2 Oct 2012 07:19:16 -0400, J R wrote: >The DSCB (and OBTAINing it) is a DASD construct. For the equivalent with tape >you have to read sequentially looking for labels. > Which, in turn, requires BLP, which is restricted at many sites. It this the reason that Rexx LISTDSI will report

Re: How to get a tape's DSCB

2012-10-02 Thread Mike Wood
Robin, If you have a tape manager such as rmm or CA-1, from ISPF you can normally issue the TI line command; both rmm and CA-1 support that. You can easily get data set details without mounting the tape. In addition, ISPF supports line commands for tape - but they have to be enabled via the con

Re: How to get a tape's DSCB

2012-10-02 Thread Lizette Koehler
, October 02, 2012 3:14 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: How to get a tape's DSCB > > I am investigating the use of catalogued tapes. We have created one such and you can > see it with ISPF 3.4, although line commands are prohibited . The existing code I am > wor

Re: How to get a tape's DSCB

2012-10-02 Thread Robin Atwood
I was hoping it would be easier than reading the labels! Thanks for the input. -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of J R Sent: 02 October 2012 19:19 To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How to get a tape's DSCB

Re: How to get a tape's DSCB

2012-10-02 Thread J R
The DSCB (and OBTAINing it) is a DASD construct. For the equivalent with tape you have to read sequentially looking for labels. > Date: Tue, 2 Oct 2012 10:14:14 + > From: robin.atw...@microfocus.com > Subject: How to get a tape's DSCB > To: IBM-MAIN@LISTSERV

Re: How to get a tape's DSCB

2012-10-02 Thread Binyamin Dissen
On Tue, 2 Oct 2012 10:14:14 + Robin Atwood wrote: :>I am investigating the use of catalogued tapes. We have created one such and you can see it with ISPF 3.4, although line commands are prohibited . The existing code I am working with dynamically allocates the DSN on the tape, reads the JF

How to get a tape's DSCB

2012-10-02 Thread Robin Atwood
I am investigating the use of catalogued tapes. We have created one such and you can see it with ISPF 3.4, although line commands are prohibited . The existing code I am working with dynamically allocates the DSN on the tape, reads the JFCB and then issues the OBTAIN macro to get DSCB informatio