If the loadlib has a very small blocksiZe (e.g. 1000 bytes, which we found in an IMS load library) that causes a frequently loaded module to be in MANY extents, there can be response time impact of seconds per transaction when those multi-extent members are loaded. Using half-track blocksize will mitigate against that kind of stupidity we found in our IMS folks who had chosen that small blocksize "to make more use of disk space" (which was itself an incorrect choice).
Barry Herbert W. “Barry” Merrill, PhD President-Programmer MXG Software Merrill Consultants 10717 Cromwell Drive Dallas, TX 75229 [email protected] http://www.mxg.com - FAQ has Most Answers [email protected] – invoices/PO/Payment [email protected] – technical tel: 214 351 1966 - expect slow reply, use email fax: 214 350 3694 – prefer email, still works -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Jake anderson Sent: Sunday, August 10, 2014 1:26 AM To: [email protected] Subject: Extents more than One for load modules library Hi All, I see some of a product load modules have extents more than 1 like 2 and 4. I still the product runs with no error and abend. Are there any impact to the product if the libraries are more than 1 ? Could you please suggest me if it is good to run the product with extents more than 1. Jake ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
