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Altos T350 F2 FAQ (Frequently Asked Questions)
22.
Does Altos T350 F2 support RAIM (Redundant Array of Independent Memory)?
ANSWER:
No.
23.
What is "Lockstep mode"?
ANSWER:
In Lockstep Channel Mode, each memory access is a 128-bit data access that spans
channel A and channel B (channel C and channel D). Lockstep Channel mode is the only RAS
mode that supports x8 SDDC. Lockstep Channel Mode requires that channel A and channel B
(channel D and channel E) must be populated identically with regards to size and
organization.
Each bit of the ECC code appears in a pair of lockstepped channels. The symbols are arranged
so that the data from every x8 DRAM is mapped to two adjacent symbols, so any failure of
the DRAM can be corrected. The correction capabilities in lockstep mode are:
•
Correction of any x4 or x8 DRAM device failure
•
Detection of 99.986% of all single bit failures that occur in addition to a x8 DRAM
failure. The Integrated Memory Controller will detect a series of failures on a specific
DRAM and use this information in addition to the information provided by the code to
achieve 100% detection of these cases.
•
Detection of all permutations of 2 x4 DRAM failures.
24.
How do I enable memory lockstep?
ANSWER:
Please enter BIOS Setup during POST.
a.
Please select Advanced.
b.
Please select Memory Configuration.
c.
Please select
Memory
RAS and Performance Configuration
d.
You would see below options:
Select Memory RAS Configuration [Maximum Performance]
e.
Please change the setting of Select Memory RAS Configuration. You will see the following
options available.
•
Maximum Performance
•
Mirroring
•
Lockstep
•
Sparing
f.
Please select Lockstep
NOTE. The Sparing only available with quad rank DIMM
NOTE. The Mirroring, Sparing or Lockstep option might not be available if the memory
population does not follow the guideline.
g.
Please save the setting before exiting from BIOS Setup.
25.
Is there any guideline about the memory DIMM population for memory lockstep?
ANSWER:
Please refer to Altos T350 F2 Product Spec.
26.
What is "Independent mode"? Does it mean the DIMM A1, B1 C1 and D1 of processor 1 no need
to be the same (capacity, model, etc) in Independent mode?
ANSWER:
Independent mode is the general mode without Mirror, lockstep functions enabled.
Please populate the same DIMM at DIMM A1, B1 C1 and D1 of Processor 1.