Mixed feelings. Probably not a good idea to set it to 0, but with a VTAM outage it's usually easier or just as easy to IPL then recycle VTAM and everything that needs it. So one way or another you're probably looking at an IPL when VTAM crashes.
The problem with 0 is other subsystems that may crash or may not be able to be brought down cleanly once you do run out of (E)CSA. So if you want to micro-manage, you can set it to IEASYSxx defined ECSA minus some reserved amount. Obviously setting it to 0 is a "set it and forget it" setting. I haven't been the one responsible for VTAM and TCP/IP in a while now, but I usually have set CSA24 to no limit and CSALIMIT to about 80% of IEASYSxx ECSA. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:[email protected] z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html On Fri, 8 Jan 2010 09:53:47 +0800, David Stephens <[email protected]> wrote: >Hi Tommy, > >I think you've already found out that setting the CSA limit to zero in >VTAM isn't a great idea. I'm always hesitant to set storage limits on >any subsystem to zero (or no limit) - I've had a couple of similar >problems over the years. > >David Stephens >Lead Systems Programmer >[email protected] >www.longpelaexpertise.com.au ><http://www.longpelaexpertise.com.au/images/logo.gif> >Ph. 0404 757 821 (from Australia) > >(Longpela Expertise Logo) >Longpela Expertise - System z Mainframe Consultants >Read new expert Mainframe articles every quarter in our LongEx Mainframe >Quarterly <http://www.longpelaexpertise.com.au/ezine> > > > >Tommy Tsui wrote: >> Hi all, >> >> One of IBM expert tell our shop to setup the CSA limit =0 in VTAM, but >> we found IST561I STORAGE UNAVAILABLE: CRA4 BUFFER POOL problem when >> one of mq server abnormal connect/reconnect to our host system. As we >> set the CSA limit to 0 therefore VTAM use up all MVS ECSA. All >> commands cannot be issued includes VTAM and MVS command. We IPL the >> LPAR finally. Is it a good practise to set the CSA limit to 0. Anyone >> can share ? >> >> >> Any help will be appreciated. >> >> ---------------------------------------------------------------------- ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
