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Altos R360 F2 FAQ (Frequently Asked Questions)
Mirroring
•
Lockstep
•
Sparing
•
f.
Please select Sparing
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.
16.
How does memory sparing work?
ANSWER: Altos R360 F2 systems implements the tracking register per rank (not per DIMM) to maintain a
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history of error occurrence (Single-Bit error), and a programmable register to hold the fail-over error threshold
level. If the count of errors on any rank exceeds that value, fail-over will commence.
Once fail-over has been initiated the memory controller (integrated in the processor) must execute every write
twice; once to the primary rank, and once to the spare rank. (This requires that the spare rank must be least
the size of the largest primary rank in use.) The duplicate write function will have copied every data location
to the spare rank. At that point, the memory controller (integrated in the processor) can switch the spare into
primary use, and take the failing rank off-line.
Note that this entire mechanism requires no software support once it has been programmed and enabled,
until the threshold detection has been triggered to request a data copy. Hardware will detect the threshold
initiating fail-over, and escalate the occurrence of that event as directed. Whatever software routine responds
to the threshold detection will select a victim rank and initiate the memory copy. Hardware will automatically
isolate the "failed" rank once the copy has completed. The data copy is accomplished by address aliasing
within the memory control interface, thus it does not require reprogramming of the DRAM row boundary
(DRB) registers, nor does it require notification to the operating system that anything has occurred in memory.
17.
Is there any guideline about the memory DIMM population for memory sparing?
ANSWER:
ANSWER: Please refer to Altos R360 F2 Product Spec.
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18.
Does Altos R360 F2 support memory mirroring for 6 DIMMs?
ANSWER: Yes, Altos R360 F2 can supports memory mirroring for 2, 4, 6, 8 DIMMs.
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19.
When fail-over of memory mirroring occurred, will there be any log in SEL to indicate the fail-over?
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ANSWER: Yes, there will be a log in SEL when fail-over of memory mirroring occurred.
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20.
Can Smart Server Manager monitor the status of memory sparing/mirroring?
ANSWER: No, Smart Server Manager cannot monitor the status of memory sparing/mirroring on Altos R360 F2.
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Current hardware implementation of Altos R360 F2 doesn't support the status monitoring of memory
sparing/mirroring.
21.
Does Altos R360 F2 support hot-plug memory?
ANSWER: No.
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22.
Does Altos R360 F2 support RAIM (Redundant Array of Independent Memory)?
ANSWER: No.
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23.
What is "Lockstep mode"?
ANSWER: In Lockstep Channel Mode, each memory access is a 128-bit data access that spans channel A and
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