Linux on 390 Port <LINUX-390@VM.MARIST.EDU> wrote on 05/23/2007 11:40:26 AM:
> >>> 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 > While the zIIPS and zAAPS and IFL's may be all ideas brought forth by marketing, the fact is, they exist. I know that there are folks out there that would love to see a zAAP processor be available to deal with Java within WebSphere, without having to incur any z/VM and/or Linux processor license charges. WebSphere in a large scale environment is exceptionally resource hungry in both memory and cycles. I personally feel it would be cost effective over the life of a z/series processor to toss a couple zAAPS into the z/VM & Linux on z/Series mix and not have to pay additional z/VM charges and Linux license charges as those processors would be dedicated only to Java processing. I would think that would help sell WebSphere for Linux on z/Series, not harm it. As far as a Linux full fledged DB2 is concerned, I can say that if the Linux DB2 were feature set identical to the z/OS version we would have converted it to Linux already. That does not help IBM in the software licensing department, however. -J ---------------------------------------------------------------------- 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
