rpinion865<https://www.mail-archive.com/[email protected]&q=from:%22rpinion865%22> wrote: >Is it not true that even though you get the zEDC engines on the z15 and z16, >you still have to pay for the exploitation by enabling Featurename('ZEDC') in >parmlib's IFAPRDxx?
David Jousma wrote: >To answer your other question, yes, ZEDC is a chargeable feature >(although very inexpensive) and is turned on in IFAPRD00. OK, I’ll try to clarify.... On z15/LinuxONE III models and higher the zEDC hardware is on-chip, standard, no additional charge, no feature code needed. “It’s just there.” In z/OS there’s an optional, chargeable software feature called “z/OS zEDC.” This licensed, chargeable feature (like other optional z/OS elements) is enabled in an IFAPRDxx parmlib member. However, if you don’t enable this chargeable element it’s still possible to exploit zEDC on z/OS to some degree. As one example, Java applications using java.util.zip’s zlib library (available in the IBM Semeru Runtimes) can exploit zEDC even without enabling the z/OS zEDC feature. Here’s how the z/OS 3.1 documentation explains it: “...With IBM Integrated Accelerator for zEDC compression on the z15 [and higher], you use IFAPRDxx only for enabling asynchronous processing (by using the FPZ4 authorized services). Entitlement of the zEDC priced feature of z/OS is not required for using zlib-based functions.” Anticipating the next question, I haven’t found a good, current list of zEDC exploiters and whether they require the z/OS zEDC feature or not. It’d be a fairly long list, and the list keeps growing. But if the product’s or component’s documentation lists the z/OS zEDC feature as a prerequisite (or a recommendation) then that’s an indicator it uses (or can use) the FPZ4 authorized services. IBM offers some tools that can help determine whether the z/OS zEDC feature would be of benefit, and how much. This whitepaper illustrates such an analysis: https://www.ibm.com/support/pages/system/files/inline-files/zEDC_White_Paper.pdf ————— Timothy Sipples Senior Architect Digital Assets, Industry Solutions, and Cybersecurity IBM Z/LinuxONE, Asia-Pacific [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
