Brian Peterson wrote:
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.
[...]
IMHO it is related to two "features":
1. Number of LPARs increased significantly on z/x90 and further on z9
2. Now HSA is "prepared" for upgrades. It is almost impossible to get
failure during dynamic HCD ACTIVATE because of lack of space in HSA.
(my opinion based on my experience only).
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.
Maybe, but I never observed HSA size change caused by MCL. I could miss
something, but I believe the changes were (*if* they were) insignificant.
BTW: IMHO it is impossible to have 1GB HSA on z9. At least 1.5-1.7GB.
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.
As usually, here in Poland, IBM "specialists" do not even try to do
System Assurance process, nor inform about any technical "gotcha". <g>
However I did some testings when new shining z9 was delivered some time
ago. I defined "rich configuration" (>16 LPARs, a lot of devices, 4
CSSes, each at max. size). then I created "minimal config" (2 LPARs, 1
CSS, very few devices, CSS size cut to number of devices). Then compared
HSA consumtion. The difference was approx. 20-30% AFAIK.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
ul. Senatorska 18
00-950 Warszawa
www.brebank.pl
Sd Rejonowy dla m. st. Warszawy
XII Wydzia Gospodarczy Krajowego Rejestru Sdowego,
nr rejestru przedsibiorców KRS 0000025237
NIP: 526-021-50-88
Wedug stanu na dzie 01.01.2007 r. kapita zakadowy BRE Banku SA (w caoci
opacony) wynosi 118.064.140 z. W zwizku z realizacj warunkowego
podwyszenia kapitau zakadowego, na podstawie uchwa XVI WZ z dnia 21.05.2003
r., kapita zakadowy BRE Banku SA moe ulec podwyszeniu do kwoty 118.760.528
z. Akcje w podwyszonym kapitale zakadowym bd w caoci opacone.
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