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Date:         Sun, 4 Nov 2007 19:20:05 EST
From:         Robert Zenuk <Robzenuk@AOL.COM>
Subject:      Re: Sharing logstreams between CICS regions
Content-Type: multipart/alternative;

I do not believe you can share the DFHLOG and DFHSHUNT Logstreams between CICS regions (CF or DASD-only). You can have multiple DFHLOG and DFHSHUNT CF Logstreams in a single CF Structure and "share" the CF Structure, but I do not believe it is posible to share the actual Logstreams.

With CF Logstreams you can share a User Journal or Log of Logs Journal across multiple regions across multiple LPAR's in the same Sysplex. With DASD-only Logstreams you can only share a User Journal or Log of Logs Journal across multiple regions on a single LPAR.

We abandon CF Logstreams about 7 years ago since we only use DFHLOG and DFHSHUNT Logstreams and our number of regions at the time (350) caused us to push the maximum number of Logstreams per Structure (12 IIRC) and Structures per CF (255 at the time) and still maintain good performance and keep 50% available Control Space. Since there is no sharing benefit to CF Logstream for DFHLOG and DFHSHUNT and we could not measure any significant performance difference, we chose to go with DASD-only for all CICS Logstreams.

Here is the recent Redbook on the topic:

_ (

Hope This Helps,


In a message dated 11/4/2007 2:55:10 PM US Mountain Standard Time, roland@SCHIRADIN.DE writes:

AFAIK you can share log streams only in the coupling facility. However I never done it and we use DASD-only.

Perhaps someone was already on this road. I would connect these regions and define them remote in the three regions. Who is responsible for a data loss? Who receive the call?


-----Original Message----- From: CICS List [mailto:CICS-L@LISTSERV.UGA.EDU] On Behalf Of George Dranes Sent: Sunday, November 04, 2007 12:17 AM To: CICS-L@LISTSERV.UGA.EDU Subject: Sharing logstreams between CICS regions

I have a couple of production CICS regions which are not connected at all. The two regions do have 4 VSAM files shared between them (opened for update with share option 3,3, the programmers have been warned numerous times about this!). We use DFHJ02 for user journalling of these VSAM files. I assume setting up one DFHJ02 logstream to be shared by both regions is the way to go rather than having a separate logstream for each region? Thanks for the help!

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