"Barbara Nitz" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > In addition to what Mark said: > > >Overspecification, such as specifying oh say 32 for a sysplex that has only > >4 systems is more likely to impact I/O times for the CDS and perhaps the > >memory to back control blocks that XCF and exploiters construct for all the > >systems that could possibly be in the sysplex. > > Underspecification is absolutely no problem, as adding a CDS with a bigger MAXSYS is a no-brainer. But try getting from overspecification to a correctly sized MAXSYS after experiencing the 'impact to I/O times': You're in for a sysplex-wide IPL! > > The impact to I/O times can be as severe as IPL failure! Especially in large sysplexes where a higher number of systems IPLs round-about the same time. I believe the serialization protocol is still dependent on a system 'owning' the CDS long enough to do the CFRM setup (policy reconciliation), and the CDSs have their own special protocol to serialize update access to the CDS. Check out a few of the newer (and older) apars dealing with I/O impact. > > Regards, Barbara
APARS? Check out the new Message Based protocol for the CFRM CDS. This reduces CDS I/O, but has (had?) a PE outstanding. Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- 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
