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Preety
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Joined: 15 Mar 2005
Posts: 23
Topics: 12
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 Posted: Wed Mar 30, 2005 3:22 am Post subject: maximum no. members in a PDS |
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Hi All,
I had a question of which I know the answer but one of my friend is saying the answer is wrong.The question was :
What will be the maximum no. of members we can create for a PDS having Space Units - TRKS, Primary quantity 100 , Secondary quantity 50 and Directory blocks 60
a) 359
b) 259
c) 459
d) it depends on some other factor not listed above
e) there is no limit
According to me the answer should be 359 as the relation between no. of directory blocks and maximum no. of members in a PDS is (6*no. of directory blocks)-1.
He has changed some other parameter while allocating a PDS and is able to make max 21 members when no. of directory blocks is given 1 which according to me should be (6*1)-1. i.e 5.
Can anyone clarify.
Thanks,
PM |
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Mervyn
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Joined: 02 Dec 2002
Posts: 415
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Location: Hove, England
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| Posted: Wed Mar 30, 2005 5:33 am Post subject: |
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Preety,
Your algorithm is correct for something like an ISPF source library, because of the ISPF statistics that are held in the directory. Make a copy of one of your libraries, then delete the statistics using ISPF option 3.5. If you then check out the dataset information using option 3.2, you will find a large difference in the directory block usage.
Load libraries have a whole load of other stuff in their directories, too.
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Preety
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Joined: 15 Mar 2005
Posts: 23
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| Posted: Wed Mar 30, 2005 5:49 am Post subject: |
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Hi,
I am not able to get what you have explained.
Colud you please elaborate more. Also please let me know which is the other parameter other than directory blocks on which it depends.
Thanks,
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Preety
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Joined: 15 Mar 2005
Posts: 23
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| Posted: Wed Mar 30, 2005 6:32 am Post subject: |
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Hi,
I have received the solution.
After allocating a PDS if we write "Stats off" in the command line in edit session of any 1 member it allows more members to be created.
Thanks,
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chandra
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Joined: 26 Sep 2003
Posts: 130
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| Posted: Wed Mar 30, 2005 6:37 am Post subject: |
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Preety,
The number of member entries that fit in a directory block is as follows:
1) For a data set with ISPF statistics: 6 entries per block.
2) For a data set without ISPF statistics: 21 entries per block.
3) For a load module data set: 4 to 7 entries depending upon
attributes.
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Preety
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Joined: 15 Mar 2005
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| Posted: Wed Mar 30, 2005 6:50 am Post subject: |
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Thanks Mervyn and Chandra.
It's quite interesting. Could you please let me know in case of load module what are the other attributes?
Regards,
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kolusu
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Joined: 26 Nov 2002
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Location: San Jose
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Mervyn
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Joined: 02 Dec 2002
Posts: 415
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Location: Hove, England
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| Posted: Wed Mar 30, 2005 9:59 am Post subject: |
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Preety,
I couldn't find a manual showing the structure of a PDS directory for a load library. This is part of the tutorial for File-Aid option 3.1, which will give you an idea of what is contained:
| Code: |
File-AID -------------- LIBRARY UTILITY - I OPTION ------------------- TUTORIAL
COMMAND ===>
PDS DIRECTORY DISPLAY (OPTION I)
The File-AID directory display lists the Directory entry of a selected
module in a readable form. At the top, the Library name and Member name
are listed, along with the TTR of the member. Next is a hex display list
of the Directory entry followed by the segment status information (SSI),
if present.
For load libraries (RECFM=U), the bottom half of the screen will display
the entry point of the module along with its size in hexadecimal and
decimal. Finally, the linkage editor attributes of the module are listed.
If Disposition is OLD for the PDS, some attributes are modifiable.
Attributes displayed and their meanings are:
RENT .............. whether or not the module is reentrant
REUS .............. whether or not the module is reusable
REFR .............. whether or not the module is refreshable
OL ................ whether or not the module is only loadable
EXEC .............. whether or not the module is executable
RMODE ............. the residency mode the module was linked with
(24-bit or any)
AMODE ............. the addressing mode the module was linked with
(24-bit, 31-bit or any)
OVLY .............. whether or not the module is overlay
DC ................ whether or not the module is downward compatible
EP ZERO ........... whether or not the module has entry point zero.
TEST .............. whether or not the module was linked with 'test'
RLD ............... whether or not the module contains RLD items.
PAGE ALIGN ........ whether or not page alignment is required
with previous versions of the linkage editor.
SCTR .............. whether or not the module was linked in scatter mode.
NE ................ whether or not the module is editable.
ZERO ORIGIN ....... whether or not the origin of the first block
of text is zero (assigned by the linkage editor).
TEST SYMBOLS ...... whether or not the module contains testran symbols.
1 BLOCK/NO RLD .... whether or not the module contains just 1 block
of text with no RLD items.
APF CODE .......... the authorization level assigned at link time.
On the FUJITSU operating system, load libraries (RECFM=U) which have
been linked using the F4 linkage editor may cause additional linkage
editor attributes of the module to be listed. Those attributes and
their meanings are:
EXTENDED .......... whether or not the module was linked with address
extension (YES = EXTENDED, NO = BASIC)
SECTION ........... the addressing mode the module was linked with
(24-bit, 31-bit or any)
DYNAMIC ........... whether or not the module was linked with the
dynamic linkage structure
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