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.
<snip>
--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
ee...@us.ibm.com
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