BDAM (was: five char device address)

2011-10-07 Thread John Gilmore
Edward Jaffe wrote:

| Brighter future?! BDAM is supported for 1TB EAV and getting a
'facelift' with zHPF
| channel programs. Where's the 'darkness' in that? As long as your
addresses are
| relative and not absolute, you are AOK!

and I very largely agree.  In the right hands even old-style BDAM can
provide much better performance than VSAM.  (The tradeoff is that one
must usually write more code than would be required if VSAM were
used.)

New users of BDAM do, however, need to be aware of its problematic
characteristics in some situations.  Because of its
record-preallocation scheme it should, for example, be avoided if its
key space would always be very sparsely populated.

There are other design alternatives to be canvassed too.  In some but
certainly not all cases, BSAM with NOTE and POINT can serve as well as
BDAM, again at the price of more code to write or cannibalize.

John Gilmore  - Ashland, MA 01721, USA

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Re: five char device address

2011-10-06 Thread MONTERO ROMERO, ENRIQUE ELOI
Hi,

Really we are near to reach the last available address, hopefully, i am not the 
one who has to deal with the problem ;-).

To move from 3390-3 to -54, several old applicactions only accept -3 model, in 
my concern, a bad programming.
I will tell to our (iocds) guy about the 5 digit device address, maybe he will 
get some idea...

Thanks a lot once again,
 
Enrique Montero

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Re: five char device address

2011-10-06 Thread R.S.

W dniu 2011-10-05 22:52, Vernooij, CP - SPLXM pisze:

Edward Jaffeedja...@phoenixsoftware.com  wrote in message
news:4e8c7d99.8020...@phoenixsoftware.com...

On 10/5/2011 7:15 AM, MONTERO ROMERO, ENRIQUE ELOI wrote:

is it possible to define device addresses over the 4 dev address?

I mean, the limit address of a device is , so what happens when

need to define more devices?, can be defined 5 chars address devices
(F) ?




Device numbers are already five digits long if you include the

subchannel set

ID. Many IOS messages format a five digit device number. For example:

IBM Documentation
IOS126I DEVICE s IS KEPT OFFLINE. text



We discovered IEE174I, which changed when we moved from z9 to z196. The
actual change was since the z10, which is why we did not notice this as
a 'z196 change'.
Kees.

  D M=chp(d4) 
IEE174I 22.49.08 DISPLAY M 524
CHPID D4:  TYPE=1B, DESC=FICON SWITCHED, ONLINE
DEVICE STATUS FOR CHANNEL PATH D4
  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
0063 +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +
0064 +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +



What misleading is first digit. One coul thing it can be any number, but 
it cannot actually. One can think it; any device, but (for 1st ditig=0) 
it cannot.
Indeed, the output on z10 look the same. but I think, the change depends 
on OS version, not the machine type.


Regards
--
Radoslaw Skorupka
Lodz, Poland


--
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Re: five char device address

2011-10-06 Thread Vernooij, CP - SPLXM
R.S. r.skoru...@bremultibank.com.pl wrote in message
news:4e8ccbd2.4000...@bremultibank.com.pl...
 W dniu 2011-10-05 22:52, Vernooij, CP - SPLXM pisze:
  Edward Jaffeedja...@phoenixsoftware.com  wrote in message
  news:4e8c7d99.8020...@phoenixsoftware.com...
  On 10/5/2011 7:15 AM, MONTERO ROMERO, ENRIQUE ELOI wrote:
  is it possible to define device addresses over the 4 dev address?
 
  I mean, the limit address of a device is , so what happens
when
  need to define more devices?, can be defined 5 chars address devices
  (F) ?
 
 
  Device numbers are already five digits long if you include the
  subchannel set
  ID. Many IOS messages format a five digit device number. For
example:
 
  IBM Documentation
  IOS126I DEVICE s IS KEPT OFFLINE. text
 
 
  We discovered IEE174I, which changed when we moved from z9 to z196.
The
  actual change was since the z10, which is why we did not notice this
as
  a 'z196 change'.
  Kees.
 
D M=chp(d4) 
  IEE174I 22.49.08 DISPLAY M 524
  CHPID D4:  TYPE=1B, DESC=FICON SWITCHED, ONLINE
  DEVICE STATUS FOR CHANNEL PATH D4
0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
  0063 +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +
  0064 +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +
 
 
 What misleading is first digit. One coul thing it can be any number,
but 
 it cannot actually. One can think it; any device, but (for 1st
ditig=0) 
 it cannot.
 Indeed, the output on z10 look the same. but I think, the change
depends 
 on OS version, not the machine type.
 
 Regards
 -- 
 Radoslaw Skorupka
 Lodz, Poland

The first digit is also the CSS id here. It pops up when moving to z10,
see OA16525.

Kees.

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Re: five char device address

2011-10-06 Thread John Eells

MONTERO ROMERO, ENRIQUE ELOI wrote:

Hi,

Really we are near to reach the last available address, hopefully, i am not the 
one who has to deal with the problem ;-).

To move from 3390-3 to -54, several old applicactions only accept -3 model, in 
my concern, a bad programming.
I will tell to our (iocds) guy about the 5 digit device address, maybe he will 
get some idea...

Thanks a lot once again,

Enrique Montero

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People often get confused about this, so just to make sure it's clear: 
No matter what you do, you cannot have more than 65,280 devices defined 
to z/OS (that is not coincidentally the number of subchannels in 
subchannel set zero).


What you can do is move PPRC secondary and PAV alias definitions from 
subchannel set 0 to subchannel sets 1 and 2, if they are available on 
your processor.  This will free subchannels in subchannel set zero that 
you could use to define additional devices.


--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
ee...@us.ibm.com

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Re: five char device address

2011-10-06 Thread R.S.

W dniu 2011-10-06 08:04, MONTERO ROMERO, ENRIQUE ELOI pisze:

Hi,

Really we are near to reach the last available address, hopefully, i am not the 
one who has to deal with the problem ;-).

To move from 3390-3 to -54, several old applicactions only accept -3 model, in 
my concern, a bad programming.
I will tell to our (iocds) guy about the 5 digit device address, maybe he will 
get some idea...


Tell us about the application. There are some limitations for some 
dataset types, but some of the limitations are relieved, or can be 
bypassed.
Example: PS dataset is limited to 64k TRK which means a little more than 
3390-3. However you can use DSNTYPE=LARGE or extended format dataset 
instead of regular PS.


--
Radoslaw Skorupka
Lodz, Poland


--
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przeznaczone wycznie do uytku subowego adresata. Odbiorc moe by jedynie 
jej adresat z wyczeniem dostpu osób trzecich. Jeeli nie jeste adresatem 
niniejszej wiadomoci lub pracownikiem upowanionym do jej przekazania 
adresatowi, informujemy, e jej rozpowszechnianie, kopiowanie, rozprowadzanie 
lub inne dziaanie o podobnym charakterze jest prawnie zabronione i moe by 
karalne. Jeeli otrzymae t wiadomo omykowo, prosimy niezwocznie 
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Re: five char device address

2011-10-06 Thread Vernooij, CP - SPLXM
R.S. r.skoru...@bremultibank.com.pl wrote in message
news:4e8db89c.7010...@bremultibank.com.pl...
 W dniu 2011-10-06 08:04, MONTERO ROMERO, ENRIQUE ELOI pisze:
  Hi,
 
  Really we are near to reach the last available address, hopefully, i
am not the one who has to deal with the problem ;-).
 
  To move from 3390-3 to -54, several old applicactions only accept -3
model, in my concern, a bad programming.
  I will tell to our (iocds) guy about the 5 digit device address,
maybe he will get some idea...
 
 Tell us about the application. There are some limitations for some 
 dataset types, but some of the limitations are relieved, or can be 
 bypassed.
 Example: PS dataset is limited to 64k TRK which means a little more
than 
 3390-3. However you can use DSNTYPE=LARGE or extended format dataset 
 instead of regular PS.
 
 -- 
 Radoslaw Skorupka

Yes, interesting applications. Although they cannot be that 'old',
3390-s are around for 2 decades or so. 
Your example of the 65k PS limit is still not limiting a dataset to a
3390-3, it will fit perfectly on a 3390-54.
How can an application demand a 3390-3? I know an application that
demands its dataset to be within the first 256 cylinders of the volume,
this is ancient private excp processing from the 70's, this is 'old'.

So, where is the 3390-3 limit?

Kees.

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e-mail or attachment is strictly prohibited, and may be unlawful. If you have 
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Re: five char device address

2011-10-06 Thread Edward Jaffe

On 10/6/2011 7:18 AM, R.S. wrote:


Tell us about the application. There are some limitations for some dataset 
types, but some of the limitations are relieved, or can be bypassed.
Example: PS dataset is limited to 64k TRK which means a little more than 
3390-3. However you can use DSNTYPE=LARGE or extended format dataset instead 
of regular PS.


This seems confused. The 64K track limitation is on the size of the data set 
itself, not the size of the volume on which it resides. Our systems have many 
ordinary DSORG=PS data sets resident in the cylinder-managed portion of an EAV 
that has a total size of 262,668 cylinders. We don't need DSNTYPE=LARGE data 
sets to have a 'large' 3390 volume.


--
Edward E Jaffe
Phoenix Software International, Inc
831 Parkview Drive North
El Segundo, CA 90245
310-338-0400 x318
edja...@phoenixsoftware.com
http://www.phoenixsoftware.com/

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Re: five char device address

2011-10-06 Thread R.S.

W dniu 2011-10-06 16:31, Vernooij, CP - SPLXM pisze:

R.S.r.skoru...@bremultibank.com.pl  wrote in message
news:4e8db89c.7010...@bremultibank.com.pl...

W dniu 2011-10-06 08:04, MONTERO ROMERO, ENRIQUE ELOI pisze:

Hi,

Really we are near to reach the last available address, hopefully, i

am not the one who has to deal with the problem ;-).


To move from 3390-3 to -54, several old applicactions only accept -3

model, in my concern, a bad programming.

I will tell to our (iocds) guy about the 5 digit device address,

maybe he will get some idea...


Tell us about the application. There are some limitations for some
dataset types, but some of the limitations are relieved, or can be
bypassed.
Example: PS dataset is limited to 64k TRK which means a little more

than

3390-3. However you can use DSNTYPE=LARGE or extended format dataset
instead of regular PS.

--
Radoslaw Skorupka


Yes, interesting applications. Although they cannot be that 'old',
3390-s are around for 2 decades or so.
Your example of the 65k PS limit is still not limiting a dataset to a
3390-3, it will fit perfectly on a 3390-54.
How can an application demand a 3390-3? I know an application that
demands its dataset to be within the first 256 cylinders of the volume,
this is ancient private excp processing from the 70's, this is 'old'.

So, where is the 3390-3 limit?


Kees,
AFAIK there is (were?) a problem with PS files used by ADABAS. ADABAS 
use its onw access method called ADAM, and the limitation was related to 
cylinder number or something else. The problem was even with 3390-9 disks.

BTW: I agree disks larger than 3390-3 are available for really long time.


Regards
--
Radoslaw Skorupka
Lodz, Poland


--
Tre tej wiadomoci moe zawiera informacje prawnie chronione Banku 
przeznaczone wycznie do uytku subowego adresata. Odbiorc moe by jedynie 
jej adresat z wyczeniem dostpu osób trzecich. Jeeli nie jeste adresatem 
niniejszej wiadomoci lub pracownikiem upowanionym do jej przekazania 
adresatowi, informujemy, e jej rozpowszechnianie, kopiowanie, rozprowadzanie 
lub inne dziaanie o podobnym charakterze jest prawnie zabronione i moe by 
karalne. Jeeli otrzymae t wiadomo omykowo, prosimy niezwocznie 
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+48 (22) 829 00 33, e-mail: i...@brebank.pl
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Re: five char device address

2011-10-06 Thread Rick Fochtman

---snip---
Yes, interesting applications. Although they cannot be that 'old', 
3390-s are around for 2 decades or so.


Your example of the 65k PS limit is still not limiting a dataset to a 
3390-3, it will fit perfectly on a 3390-54. How can an application 
demand a 3390-3? I know an application that demands its dataset to be 
within the first 256 cylinders of the volume, this is ancient private 
excp processing from the 70's, this is 'old'.


So, where is the 3390-3 limit?
---unsnip--
Any program using BDAM with calculated relative or absolute disk 
addresses can run afoul of device limitations; that's mainly why these 
types of things are discouraged. If you really think you need BDAM with 
calculated addresses, consider the use of VSAM RRDS instead. Fewer 
device dependancies and a far brighter future.  :-)


Rick

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Re: five char device address

2011-10-06 Thread Edward Jaffe

On 10/6/2011 1:04 PM, Rick Fochtman wrote:
Any program using BDAM with calculated relative or absolute disk addresses can 
run afoul of device limitations; that's mainly why these types of things are 
discouraged. If you really think you need BDAM with calculated addresses, 
consider the use of VSAM RRDS instead. Fewer device dependancies and a far 
brighter future.  :-)


Brighter future?! BDAM is supported for 1TB EAV and getting a 'facelift' with 
zHPF channel programs. Where's the 'darkness' in that? As long as your addresses 
are relative and not absolute, you are AOK!


--
Edward E Jaffe
Phoenix Software International, Inc
831 Parkview Drive North
El Segundo, CA 90245
310-338-0400 x318
edja...@phoenixsoftware.com
http://www.phoenixsoftware.com/

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Re: five char device address

2011-10-06 Thread Rick Fochtman

---snip---

Any program using BDAM with calculated relative or absolute disk 
addresses can run afoul of device limitations; that's mainly why 
these types of things are discouraged. If you really think you need 
BDAM with calculated addresses, consider the use of VSAM RRDS 
instead. Fewer device dependancies and a far brighter future.  :-)



Brighter future?! BDAM is supported for 1TB EAV and getting a 
'facelift' with zHPF channel programs. Where's the 'darkness' in that? 
As long as your addresses are relative and not absolute, you are AOK!


--unsnip-
ISTR reading somewhere that DBAM was now Class-C. Perhaps the old memory 
banks got scrambled somewhere.  :-(


Rick

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Re: five char device address

2011-10-06 Thread Ed Gould
 Rick,
Hehe we had an oem product that modified BDAM to search key (equal and low) I 
could be wrong it#39;s been 40 years. It was a one or two byte zap.

It#39;s all hazy but I do remember them looking through microfiche and having 
to maintain the zap as we got stuck with ownership. I sure was glad I 
wasn#39;t in that meeting.

Ed

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five char device address

2011-10-05 Thread MONTERO ROMERO, ENRIQUE ELOI
Hi to all,

is it possible to define device addresses over the 4 dev address?

I mean, the limit address of a device is , so what happens when need to 
define more devices?, can be defined 5 chars address devices (F) ?

Best regards,

Enrique Montero.

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Re: five char device address

2011-10-05 Thread R.S.

W dniu 2011-10-05 16:15, MONTERO ROMERO, ENRIQUE ELOI pisze:

Hi to all,

is it possible to define device addresses over the 4 dev address?

I mean, the limit address of a device is , so what happens when need to 
define more devices?, can be defined 5 chars address devices (F) ?


There is no simple YES/NO answer.
Generally speaking, NO device adresses are 4-digits.
However since times of z9 machine and (AFAIK) zOS 1.7 t's possible to 
move 3390A aliases to another cosmos leaving more addresses for 
regular devices. It's called MSS - multiple subchannel set. Nowadays 
it's also possible to use MSS1 for PPRC secondary devices (AFAIK new 
device types in HCD dialogs).


What happens when you reach the limit? You HAVE A PROBLEM!
Possible solutions:
1. Move aliases to MSS1. That should relieve the constraint.
2. Use less aliases. Not so stupid, when you also start using HyperPAV.
3. Use bigger device types. Vast majority of devices are disks. You can 
have plenty of 3390-3, or plenty/3 of 3390-9 or less 3390-54, or quite 
few EAV devices.
4. Use duplicate device addresses. This is solution for multiple CPCs 
NOT SHARING all the disks. Example: CPC A is connected to DASD1 and 
DASD2. CPC B is connected to DASD1 and DASD3. So, DASD2 and 3 can be 
addressed using the same device numbers.




BTW: Do you really have such problem?

--
Radoslaw Skorupka
Lodz, Poland


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Re: five char device address

2011-10-05 Thread Edward Jaffe

On 10/5/2011 7:15 AM, MONTERO ROMERO, ENRIQUE ELOI wrote:

is it possible to define device addresses over the 4 dev address?

I mean, the limit address of a device is , so what happens when need to 
define more devices?, can be defined 5 chars address devices (F) ?



Device numbers are already five digits long if you include the subchannel set 
ID. Many IOS messages format a five digit device number. For example:


IBM Documentation
IOS126I DEVICE s IS KEPT OFFLINE. text

Explanation:  During IPL, it was determined that a device was kept offline
for a specific reason. The reason is described by the message text.

In the message text:

s The subchannel set ID and device number of the device kept
  offline.

text  Describes the reason the device is kept offline and is as
  follows:

  A PRIMARY OF A SPECIAL PAIR IS ONLY EXPECTED IN SUBCHANNEL SET y
  Where 'y' is the subchannel set selected for IPL.

  During device initialization, this device was found to be
  operating in Primary mode as part of a Special pair and was
  found in a subchannel set that was not selected for IPL.
  Devices operating in Primary mode are only expected in the
  subchannel set that was selected for IPL. See z/OS HCD
  Planning for information on Special pairs.

  During IPL, the system determines which subchannel set to
  use for devices that are accessible from multiple subchannel
  sets based on:

  o   The SCHSET parameter specified in the LOADxx parmlib
  member. See z/OS MVS Initialization and Tuning
  Reference.

  o   The operator's response to IEA111D if it was issued. See
  z/OS MVS System Messages, Vol 6 (GOS-IEA).
/IBM Documentation

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Re: five char device address

2011-10-05 Thread Vernooij, CP - SPLXM
Edward Jaffe edja...@phoenixsoftware.com wrote in message
news:4e8c7d99.8020...@phoenixsoftware.com...
 On 10/5/2011 7:15 AM, MONTERO ROMERO, ENRIQUE ELOI wrote:
  is it possible to define device addresses over the 4 dev address?
 
  I mean, the limit address of a device is , so what happens when
need to define more devices?, can be defined 5 chars address devices
(F) ?
 
 
 Device numbers are already five digits long if you include the
subchannel set 
 ID. Many IOS messages format a five digit device number. For example:
 
 IBM Documentation
 IOS126I DEVICE s IS KEPT OFFLINE. text
 

We discovered IEE174I, which changed when we moved from z9 to z196. The
actual change was since the z10, which is why we did not notice this as
a 'z196 change'.
Kees.

 D M=chp(d4) 
IEE174I 22.49.08 DISPLAY M 524   
CHPID D4:  TYPE=1B, DESC=FICON SWITCHED, ONLINE  
DEVICE STATUS FOR CHANNEL PATH D4
 0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  
0063 +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  
0064 +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  

Kees.

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