Cisco Cisco C880 M4 Server
CHAPTER 2 Component Configuration and Replacement (Add, Remove)
2.1 High availability configuration
2.1 High availability configuration
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C122-E175-01EN
2.1.2 Memory Mirror
In the Cisco C880 server, the Mirror Mode and the Partial Mirror Mode are supported as the memory mirror,
in which the function with the CPU is used. Full Mirror/Partial Mirror can be selected from the MMB Web-UI.
in which the function with the CPU is used. Full Mirror/Partial Mirror can be selected from the MMB Web-UI.
TABLE 2.2 Memory Mirror Mode
Mirror type
Description
Full Mirror
Memory Mirroring is executed to memories on all SBs included in a partition.
Partial Mirror
Memory Mirroring is executed to memories on only Home SB included in a
partition. Memory Mirroring is not executed for an SB which is not the Home
SB.
partition. Memory Mirroring is not executed for an SB which is not the Home
SB.
Memory Mirror RAS
This section describes the operation when there is an error in the DIMM in the Memory Mirror status.
-
The Memory operation when using the Memory Mirror is selected from the MMB Web-UI.
-
Mirror maintenance mode (the default)
When restarting the system, the failed DIMM and the paired DIMM are not incorporated. The other normal
DIMMs will maintain the Memory Mirror.
When restarting the system, the failed DIMM and the paired DIMM are not incorporated. The other normal
DIMMs will maintain the Memory Mirror.
- The Memory Mirror status will be maintained because only the normal DIMM would be used.
- Since the DIMM area suspected to have failed will be degraded, the memory capacity seen from the
operating system will be reduced.
-
Memory capacity maintenance mode
The Memory Mirror status of the memory mirror group in which the memory suspected to have failed will
be deleted after the system is restarted. Up to six The DIMM (DIMM with the same NN number as the
DIMM#NNM), including the failure suspected memory are not incorporated. The memory mirror group
maintains the status of the Memory Mirror.
The Memory Mirror status of the memory mirror group in which the memory suspected to have failed will
be deleted after the system is restarted. Up to six The DIMM (DIMM with the same NN number as the
DIMM#NNM), including the failure suspected memory are not incorporated. The memory mirror group
maintains the status of the Memory Mirror.
For details on the memory mirror group, see ‘
TABLE 2.3
Memory mirror group
Memory mirror group 1
Memory mirror group 2
Memory mirror group 3
Memory mirror group 4
DIMM#0A0
DIMM#0C0
DIMM#1A0
DIMM#1C0
DIMM#0A1
DIMM#0C1
DIMM#1A1
DIMM#1C1
DIMM#0A2
DIMM#0C2
DIMM#1A2
DIMM#1C2
DIMM#0A3
DIMM#0C3
DIMM#1A3
DIMM#1C3
DIMM#0A4
DIMM#0C4
DIMM#1A4
DIMM#1C4
DIMM#0A5
DIMM#0C5
DIMM#1A5
DIMM#1C5
DIMM#0B0
DIMM#0D0
DIMM#1B0
DIMM#1D0
DIMM#0B1
DIMM#0D1
DIMM#1B1
DIMM#1D1
DIMM#0B2
DIMM#0D2
DIMM#1B2
DIMM#1D2
DIMM#0B3
DIMM#0D3
DIMM#1B3
DIMM#1D3
DIMM#0B4
DIMM#0D4
DIMM#1B4
DIMM#1D4
DIMM#0B5
DIMM#0D5
DIMM#1B5
DIMM#1D5
-
Since the memory mirror group having a failure suspected DIMM operates in the Non Mirror, the status
would be Partial Memory Mirror.
would be Partial Memory Mirror.
-
Since half the number of DIMMs having a failure suspected DIMM in a Partial Mirrored memory group will
not be incorporated, the memory capacity seen from the operating system will be maintained.
not be incorporated, the memory capacity seen from the operating system will be maintained.
The memory incorporation status before and after the system restart is shown below.