Portal | Manuals | References | Downloads | Info | Programs | JCLs | Master the Mainframes
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Usergroups Profile Log in to check your private messages Log in
 

 

Why CDS for DFHSM should not have seconadry extents

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> All Other Mainframe Topics
View previous topic :: :: View next topic  
Author Message
praveensinha
Warnings : 1

New User


Joined: 02 Oct 2009
Posts: 64
Location: Hyd

PostPosted: Wed May 05, 2010 2:42 pm    Post subject: Why CDS for DFHSM should not have seconadry extents
Reply with quote

Question 1.Why CDS for DFHSM should not have seconadry extents ??
I googled n found following reasons

A deadlock may occur
CDS issues a messages

Can any one explain this ?

Question 2
What are multicluster CDS( I know the limit of cluster is 4 )..I want to know ,how it is different from single cluster CDS?
Back to top
View user's profile Send private message

expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Wed May 05, 2010 4:02 pm    Post subject:
Reply with quote

I don't really know why IBM suggest (i.e. tell you) that the CDS should be single extent, but obviously you have googled and found one example of what may happen. I usually follow the IBM recommendations without very many questions as I believe that they do know what they are talking about.

A multi cluster CDS is when the current CDS will not fit on one volume, or perhaps for performance reasons. It is possible to split a CDS into two (possibly more - but it is a good few years since having had to do this) so you will need DD names such as BCSD and BCDS2 etc. etc.

It is all very well explained in the fine manuals along with the CDS split analyser.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> All Other Mainframe Topics All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts Finding unreferenced datasets without... Alan Playford JCL & VSAM 5 Tue Jul 12, 2016 9:07 pm
No new posts SDSF REXX for DFHSM vasanthz IBM Tools 7 Mon May 11, 2015 7:16 pm
No new posts DFHSM - CPU & EXCP vasanthz JCL & VSAM 1 Thu Dec 19, 2013 9:22 pm
No new posts DFHSM: message - FUNCTION NOT PROCESS... pietras65 JCL & VSAM 3 Fri Sep 13, 2013 3:13 pm
No new posts DFHSM JOURNAL dataset filling up very... RK1 All Other Mainframe Topics 4 Mon Jul 29, 2013 5:30 pm


Facebook
Back to Top
 
Mainframe Wiki | Forum Rules | Bookmarks | Subscriptions | FAQ | Tutorials | Contact Us