>>> On Tue, May 22, 2007 at 10:21 AM, in message <[EMAIL PROTECTED]>, "McKown, John" <[EMAIL PROTECTED]> wrote: > Yes, I know this will be a stupid question. But I will ask anyway > because I have no fear (or was that no sense?). A zAAP engine is used by > z/OS to run Java code. The only reason for such an engine was because of > the CPU demands of Java and the fact that adding the required CPU power > using a general purpose engine would drive up the other software costs. > That is, a zAAP engine is a marketing ploy to "sell" Java (an maybe some > other Java-dependant software such as WAS). It is not a solution to a > technical problem with Java on z/OS. Therefore, there is no need/reason > for Linux on System z to ever support a zAAP (or zIIP or other specialty > engine which is "marketing" oriented). True?
Understand that _all_ the specialty engines are "marketing" driven. There's no technical problem being solved by an IFL, either. They're all intended to make "new workloads" more attractive on System z hardware. The IFL was first, which caused a bit of an uproar in the z/OS customer base, so the zIIPs and zAAPs weren't far behind. One thing about the zIIPs to keep in mind is that only up to 40% of "eligible" DB2 workload can be offloaded. You'd need more than a couple CPs worth of DB2 workload to be eligible to fully utilize one. That's not the case on an IFL, and as Robert pointed out, if there is a lull in the incoming DB2 work, that capacity can be used by z/VM or other guests. Now, if the version of DB2 that is available for Linux would only be upgraded to have all the features and functionality of the z/OS version, it would be much easier to move workload from standard CPs to IFLs. Which, perhaps, is the reason why that hasn't happened so far. Mark Post ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
