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Conference rdgeng::cics_technical

Title:Discussion of CICS technical issues
Moderator:IOSG::SMITHF
Created:Mon Mar 13 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:192
Total number of notes:680

185.0. "Can i start cicsip manually ?" by DEKVC::DOOGYUPARK () Thu Apr 24 1997 05:58

Hi,

I have a question on control of connection from IBM clients.

We have about 1000 IBM clients and Dunix CICS.

If a region crashes and re-starts , then as soon as the region is up
at worst case,800 clients may try to connect to the region at the 
same moment.

The region have 6 listeners(ld),therefore 6 ip port defined in the system.

So,if it is possile to start listeners(cicsip) manually then i can 
start the 6 cicsip in a sufficient time interval so that can avoid the rushes 
of client's requests.

Is it possible ?


p.s.: Of course,all requests will be queued within CICS , but i don't know 
      how many requests could be queued.
      I have a experience that if the queued requests are much more than the
      number of cicsas then the region fall into hang.
      And we are impatient to wait the region to come back to normal state.
       

Thanks a lots,
dg.
T.RTitleUserPersonal
Name		DateLines
185.1region startup delays...LJSRV2::nqsrv422.nqo.dec.com::WorkbenchTue Apr 29 1997 19:1125
Hi,

I don't know if this will help or not, but a customer I worked with had
a similar situation with everyone trying to log back in simultaneously
after a region crash, sometimes taking up to an hour to recover.

In our case, the delay in the region starting was related to recovering
all the aborted terminal sessions.  If you are doing a warm re-start
(and I presume you are...), you should see all the recovery procedures
run for the database, the region and all previously logged in users, before 
the region is available for users to log in (all these events show up in
the console.msg file...)

We never did find a way to throttle the number of users logging in.  We
had ~150 users, and 20-30 cicsas servers running.  Hint - if you haven't
done this already, make sure you are starting all cicsas server processes
up front when the region starts - don't allow it to happen dynamically,
or you will likely see worse performance due to server startup overhead.

I have not seen the problem you aluded to regarding the number of
pending login requests queued .vs. cicsas servers running.

rgds,

Duane
185.2Any DEKVC::JUNMOKSONGFri May 16 1997 23:007
    Hi,
    I am in USA now and we , CICS instructor and me , discussed with
    your problem and he said to check RegionPool Size ,that is , default is
    1k. As you know, we can check  that by CSTD on  cicsterm.
    I hope this help you.
    Regards,
    Jun-Mok Song