W dniu 2010-07-22 19:46, John Eells pisze:
Paul Gilmartin wrote:
On Thu, 22 Jul 2010 15:50:15 +0300, GADI wrote:
Between 32GB and 3TB of RAIM.
Oops! Vocabulary time warp. When did "Storage" become "Memory"?
A while back. I don't recall exactly when but it's been something like
five years or longer when discussing real memory...at least, for
announcements and such.
Is Redundant array of independent memory (RAIM) much different from ECC?
Yes, very different. It's a RAID-like array for memory. So if you lose
enough ECC-based memory the hardware can still recover without
presenting a machine check. The HW announcement says:
Major redesign of memory subsystem for improved availability: IBM's most
robust error correction to date can be found in the memory subsystem. A
new redundant array of independent memory (RAIM) technology is being
introduced to provide protection at the dynamic random access memory
(DRAM), dual inline memory module (DIMM), and memory channel level.
Three full DRAM failures per rank can be corrected. DIMM level failures,
including components such as the controller application specific
integrated circuit (ASIC), the power regulators, the clocks, and the
board, can be corrected. Memory channel failures such as signal lines,
control lines, and drivers/receivers on the MCM can be corrected.
Upstream and downstream data signals can be spared using two spare wires
on both the upstream and downstream paths. One of these signals can be
used to spare a clock signal line (one upstream and one downstream).
Together these improvements are designed to deliver System z's most
resilient memory subsystem to date.
Are modules hot-pluggable?
Sorry, I don't know. If I happen to run into one of the HW team, I'll ask.
I know, cause I saw it (even swapped): NO.
You have to remove the book if you want to open the case. That's why the
memory cannot be hot-pluggable.
However:
a) the book itself can be hot-plugged and unplugged (although I'm aware
of serious problem caused by such process).
b) the memory can be enabled by microcode - like CP. It's even an option
for CIU.
--
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 01.01.2009 r. kapita zakadowy BRE Banku SA (w caoci
wpacony) wynosi 118.763.528 zotych. W zwizku z realizacj warunkowego
podwyszenia kapitau zakadowego, na podstawie uchway XXI WZ z dnia 16 marca
2008r., oraz uchway XVI NWZ z dnia 27 padziernika 2008r., moe ulec
podwyszeniu do kwoty 123.763.528 z. Akcje w podwyszonym kapitale zakadowym
BRE Banku SA bd w caoci opacone.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
