HSA has been getting significantly larger over recent generations of zSeries hardware. The first significant bump was z900 to z990, where z990 was quite a bit larger HSA than z900. The z9-EC Technical Guide (SC24-7124) includes the following statement:
-=-=-=-=- Note: The size of the HSA on the z9 EC may be significantly larger than on a z990 or z890 system. It may range from less than 2 GB to up to 4.5 GB for a fully configured system. Especially for systems with relatively small memory sizes, caution is requested. We recommend using the HSA Estimator for z9 EC, available on Resource Link, to be able to plan for a sufficient amount of memory. -=-=-=-=- If you've managed a 1 gig HSA on a z9 processor (your post didn't mention whch exact processor it was), I'd say you're doing great. But, beware - HSA can increase at the installation of new Driver levels or even MCLs, depending on what function is included in each, so if you choose to run so close to the limit, keep this in mind. When our z9 was installed, the topic of "HSA increase planning" was covered during the IBM Solutions Assurance process. It was covered in the checklist I was asked to fill out, and it was covered in detail in the "Must Read" document I was given. I was grateful for the reminder during the Solutions Assurance process, even though I was already aware that HSA was much larger in current machines than the machines we were moving from. Brian On Sat, 4 Aug 2007 13:14:52 -0400, Pinnacle wrote: >The HSA on our 9672 running OS/390 V2R10 is a whopping 64M, compared to >1344M on the z9 at z/OS V1R8. We eliminated the DYNAMIC attribute on 1024 >DASD devices, and that dropped HSA to 1024M. WTF is HSA so ridiculously >large on the current hardware/software, for essentially the same I/O config? > >Regards, >Tom Conley ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
