CHAPTER 1 Product Overview
1.4 Hardware technologies
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CA92344-0534-07
cannot be corrected by Error Checking Correction (ECC), such as multi-bit error, which attains a continuous
and stable system operation.
In the PRIMEQUEST 2000 series, the Memory Mirror function is selected from the following Memory Mirror
Mode.
-
Full Mirror: All memory in all SB and Memory Scale-up Board of specific partition is mirrored.
-
Partial Memory Mirror: The memory included in only the Home SB of the partition is duplicated.
-
Address Range Mirror: All memory in all SB and Memory Scale-up Board of specific partition is mirrored,
and duplicated rate can be configured arbitrarily.
Available Memory Mirror Mode in each model is shown below.
Table 1.4 Available Memory Mirror Mode
Memory Operation
Mode
PRIMEQUEST
2400E3/2800E3/2800B3
PRIMEQUEST
2400E2/2800E2/2800B2
PRIMEQUEST
2400E/2800E/2800B
Full Mirror
Supported
Supported
Supported
Partial Memory Mirror Supported
Supported
Supported
Address Range Mirror Supported
Not supported
Not Supported
Using the Memory Mirror, the partition can keep operating even if duplicated memory fails. The failed
memory will be removed from the partition (memory degradation) at next reboot. In full mirror mode and
partial mirror mode, the operation when there is memory degradation due to a memory fault can be selected
from the following.
-
Mirror Keep Mode: The memory duplication is maintained even after memory degradation.
-
Capacity Keep Mode: The memory capacity is maintained by cancelling the memory duplication either
partially or in full.
For the details on the Memory Mirror function, see ‘3.2.5 Memory Mirror’ in “
PRIMEQUEST 2000 Series
Administration Manual
” (CA92344-0537).
1.4.5 Memory Sparing Function
The PRIMEQUEST 2000 series is provided with a Memory Sparing function.
The Memory Sparing function prepares spare rank (a rank means unit of the block of memory module.) to
endure rank errors. If predictive failure of a rank is detected, copying the data of the rank into the spare rank
not to use failed rank will be able to keep the partition operating.
The Memory Spare function is enabled by the MMB Web-UI.
-
In PRIMEQUEST 2400E3/2800E3/2800B3/2400E2/2800E2/2800B2, up to half number of total ranks on
a DDR channel per DDR channel can be spared.
-
In PRIMEQUEST 2400E/2800E/2800B, one rank on a DDR channel per DDR channel can be spared.
Note
The PRIMEQUEST2000 series does not support Memory Sparing between CPU sockets and between DDR
Channels. When using Memory Sparing, it is necessary to mount the DIMM in such a way so as to have
multiple Ranks in a DDR Channel. If Memory Spare Mode is selected at the order placement, corresponding
PRIMEQUEST systems are shipped in such a way so as to fulfil this condition.
1.4.6 Reserved SB Function
PRIMEQUEST 2400E3/2800E3/2400E2/2800E2/2400E/2800E models support Reserved SB function.
The Reserved SB function is the function where a faulty SB is automatically removed from the partition, and
the Reserved SB which is previously configured is added to a partition when the partition is powered on.
SB reserved for switching at the time of failure, is called Reserved SB. Since the partition is automatically
reconfigured / restarted, there is improved operation continuity.
For details on the Reserved SB function, see ‘3.2.3 Reserved SB’ in “
PRIMEQUEST 2000 Series
Administration Manual
” (CA92344-0537).
