> -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of Feller, Paul > Sent: Thursday, November 16, 2006 7:00 AM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: HSA size on Z9 BC > > > I'm not at the office so I can't check what the HSA size is > for our two z9 boxes. I do know that it is close to 1.3 to > 1.5 gig. The larger HSA size started with the z890 and z990 > boxes. I agree with what was said about IBM taking customer > storage for the HSA. It would be nice if IBM could find a > way to have some storage just for HSA. > > > Paul Feller
Either way, you're going to pay. If there is HSA-only memory, then you'll need to size that independantly of your "user memory". What happens when your IOCDS won't fit any more due to growth? You'll need an upgrade! Expensive. So long as IBM is up front about a 16GiB box not necessarily having 16GiB for use by an OS, then I'm OK with the HSA coming out of regular memory. Also remember that the z system boxes are becoming more heavily millicoded. Millicode is based on a subset of "normal" zArch instructions (the "hard wired" ones) plus "extra". If HSA memory were something special, the I'd bet that the millicode interface would be greatly complicated. Not that I know how it works now! Also remember that PRSM / LPAR management resides in the HSA as well. So as features are added, they take more memory. It would almost be like a shop which is running VSE or z/OS decides to go to z/VM, then complains that z/VM "takes up real memory to run!" And then ask why z/VM doesn't have its own memory pool, seperate from the guest's real memory pool. Oh, and that the z/VM memory pool be "free"? -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited.
