Date: Mon, 5 Nov 2007 08:32:59 -0700
Reply-To: CICS List <CICS-L@LISTSERV.UGA.EDU>
Sender: CICS List <CICS-L@LISTSERV.UGA.EDU>
From: Rick Woods <Rick.Woods@AZDOA.GOV>
Subject: Re: Sharing logstreams between CICS regions
Content-Type: TEXT/plain; charset="US-ASCII"
Thanks for the link to the Redbook!
>>> "Robert Zenuk" <Robzenuk@AOL.COM> 11/4/2007 5:20 PM >>>
I do not believe you can share the DFHLOG and DFHSHUNT Logstreams
CICS regions (CF or DASD-only). You can have multiple DFHLOG and
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.
DASD-only Logstreams you can only share a User Journal or Log of Logs
multiple regions on a single LPAR.
We abandon CF Logstreams about 7 years ago since we only use DFHLOG
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
CF (255 at the time) and still maintain good performance and keep 50%
available Control Space. Since there is no sharing benefit to CF
DFHLOG and DFHSHUNT and we could not measure any significant
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,
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
and define them remote in the three regions. Who is responsible for a
data loss? Who receive the call?
From: CICS List [mailto:CICS-L@LISTSERV.UGA.EDU] On Behalf Of George
Sent: Sunday, November 04, 2007 12:17 AM
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
update with share option 3,3, the programmers have been warned
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
region? Thanks for the help!
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