Technical Product Specification

Intel® Server Board S1600JP TPS BIOS Setup Interface
Setup Item
Options
Help Text
Comments
Demand Scrub
Enabled
Disabled
When enabled, executes
when an ECC error is
encountered during a normal
read/write of data and corrects
that data.
When enabled, Demand Scrub automatically
corrects a Correctable ECC Error
encountered during a fetch from memory by
writing back the corrected data to memory.
Correctable
Error Threshold
None
All
5
10
20
Threshold value for logging
Correctable Errors (CE) –
Threshold of 10 (default) logs
10th CE, "All" logs every CE
and “None”’ means no CE
logging. All and None are not
valid with Rank Sparing.
Specifies how many Correctable Errors must
occur before triggering the logging of a SEL
Correctable Error Event. Only the first
threshold crossing is logged, unless “All” is
selected. “All” causes every CE that occurs to
be logged. “None” suppresses CE logging
completely.
When Rank Sparing RAS Mode is configured,
“All” and “None” are not valid, so they will not
be presented as choices.
This threshold is applied on a per-rank basis.
The Correctable Error occurrences are
counted for each memory rank. When any
one rank accumulates a CE count equal to
the CE Threshold, then a single CE SEL
Event is logged, and all further CE logging is
suppressed.
Note that the CE counts are subject to a
“leaky bucket” mechanism that reduces the
count as a function of time, to keep from
accumulating counts unnecessarily over the
term of a long operational run.
This is also the Correctable Error threshold
used when Rank Sparing RAS Mode is
configured. When a CE threshold crossing
occurs in Rank Sparing Mode on a channel
which is in Redundant state, it causes a
Sparing Fail Over (SFO) event to occur. That
threshold crossing will also be logged as a
Correctable Error event if it is the first to occur
on the system.
An SFO event causes the rank with the error
to be replaced by the spare rank for that
channel and the channel goes to a non-
redundant state (with a “Redundancy
Degraded” SEL Event logged). There may be
an SFO for each channel in the system,
although only the first one can be logged as a
CE event.
Revision 1.9 85