"Christian Blesa" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > Hi folks!! > > Thanks a lot for your answers. I'm learning a lot with you. > > At DB2-list (http://www.idugdb2-l.org/archives/db2-l.html) I found > following discussion: > > **********************************************************************
> ********************************************************************** > The end > ********************************************************************** > > Last week, I assisted to MVS Performance course and instructor says that > interval of 300-500 pag/sec was the recommendation in 1991. Also he told > us that is possible that this values could be true today but we think that > it'll be too high. Maybe, 50 pag/sec could be a good value? > > If MVS is Multiple Virtual Storage... paging should be used, not? > Some general remarks: Be careful with old recommandations that were valid for old systems and configurations. AFAIK, System paging is the total paging in the system. When storage was expensive, the tradeoff was more towards more paging than it is now. There once was a ROT that no more than 5% of processor capacity should be used for paging. IIRC this resulted in 500 pages per second per engine for those day's machine types. IIRC, DB2 takes paging into consideration when deciding to let a page from its buffer be paged-in or to reread it from the database, chaning it to an active I/O. Blockpaging was introduced at some point in time. Paging performance also influences acceptable paging rates. Pages datasets on Ficon channels with PAV's will allow more paging than older Escon non-PAV pageds. I heard of systems running 1000's of pages/sec and running fine (Shane, was that you?). So, if there is a new ROT, it will depend on your system and configuration. 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. ********************************************************************** ---------------------------------------------------------------------- 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
