>From a note many moons ago.... The z9 uses a fixed 2 GB for HSA "AND" that 2 GB is added to the box, over an above what memory you purchased.
i.e. your proposed 8 GB box will have 10 GB installed. Tom Duerbusch THD Consulting (however, I don't have any thing in writing from an IBM publication that this is so....but I haven't really looked either) >>> "Peter Webb, Toronto Transit Commission" <[EMAIL PROTECTED]> 7/20/2007 8:41 >>> AM >>> We're going for the minimum, which is 8GB. So that will be 2GB to HSA, 2GB for expanded store and 4GB for general use. Still a BIG increase. Peter -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Feller, Paul Sent: July 20, 2007 09:24 To: LINUX-390@VM.MARIST.EDU Subject: Re: Betr.: Re: Dynamic I/O Watch how much memory you get on the z9 BC. The size of the HSA jumps up a large amount. We just installed a z9 BC as an external coupling facility. We set it up for no dynamic IO changes and the HSA is still 1728 meg. Paul Feller AIT Mainframe Technical Support [EMAIL PROTECTED] (319)-355-7824 -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Peter Webb, Toronto Transit Commission Sent: Friday, July 20, 2007 8:06 AM To: LINUX-390@VM.MARIST.EDU Subject: Re: Betr.: Re: Dynamic I/O We are running on a MP2000 with 1 gig of memory. Out of that 1 gig comes the HSA plus additional storage CP needs to allocate dynamic devices. We have several VSE guests to support plus some CMS workload. Occasionally during the day, we have file transfers from VSE to Windows going through a 600 MB v-disk. The paging load during the file transfers just kills CMS response time. Even taking a bit more main storage to increase the HSA for dynamic I/O just isn't a good idea. Now, if our plans to purchase a z9 BC go through, we'll be laughing. Peter -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Pieter Harder Sent: July 19, 2007 15:41 To: LINUX-390@VM.MARIST.EDU Subject: Betr.: Re: Dynamic I/O I don't quite get your statement on memory demands. Dynamic I/O is done within the Hardware Storage Area (HSA) that is allocated fixed on Power-on-Reset after analyzing your IOCDS config. The dynamic requirements for issuing dynamic config commands is probably to small to measure. (Barton/Rob?) Best regards, Pieter Harder [EMAIL PROTECTED] tel +31-73-6837133 / +31-6-47272537 >>> "Peter Webb, Toronto Transit Commission" <[EMAIL PROTECTED]> 07/19/07 9:31 >>> Funny, I was just looking into using dynamic I/O on our box. See http://publibz.boulder.ibm.com/epubs/pdf/hcsg1b20.pdf, Part 2 Using Dynamic I/O Configuration. In our case we won't use it. We are memory constrained at times, and don't need the aggravation of performance problems caused by the extra memory demands of dynamic I/O. Peter -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Brad Hinson Sent: July 19, 2007 14:37 To: LINUX-390@VM.MARIST.EDU Subject: Dynamic I/O I've done a couple of disk changes recently that require updates to our IOCDS config, and it's getting hard to schedule a Power On Reset each time to recognize the changes. I see a checkmark on the HMC that indicates Dynamic I/O is possible if you have the right pieces in the config you import. Is anyone using Dynamic I/O, or can you point me to some docs (or perhaps another list) on this? Also, any docs on the format of the IODEVICE (and other) statemtents in this config would also be useful. Thanks, -- Brad Hinson <[EMAIL PROTECTED]> Sr. Support Engineer Lead, System z Red Hat, Inc. 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