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C122-B001-02EN
CHAPTER 1 PRIMEQUEST Overview
1.2.1.4 System Mirror
System Mirror duplicates the address cross bar and data cross bar, the inside of the
chip set, and memory. Thus, even if a duplicated component fails, its mirror, the
normal component, can continue the system processing. The use of System Mirror
can thus increase reliability and improve continuity of business.
For example, even when a memory failure occurs, the side containing the faulty
memory can be stopped but the operation can be continued by using normal memory.
Thus, the entire system is not stopped and the operation can be continued.
System Mirror can be switched using the MMB Web-UI.
When System Mirror is not being used, only the address cross bar is duplicated.
Memory is not duplicated and up to the maximum amount of memory space can be
used.
To use System Mirror, a license key (optional product) is required.
For details of System Mirror, see Section
Figure 1.5 System Mirror
Remarks: This function is different from disk mirroring (RAID1), which writes data to
two hard disk drives at the same time. For disk mirroring, see Section
"Redundancy of an HDD (Use of PRIMECLUSTER GDS)."
Improved business continuity with System Mirror
The PRIMEQUEST System Mirror greatly improves business continuity.
shows a comparison of operation with and without System Mirror. In
operation without System Mirror, if a hardware failure occurs while the system is
operating, the system (task) stops. Then, the cause of the failure is investigated,
which is followed by repair work and other processing. Finally, the system is
recovered and restarted. The task remains stopped throughout this period.
System mirror mode
Crossbar
MMB
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MMB
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IOU
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IOU
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IOU
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IOU
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IOU
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IOU
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SB
#1
SB#0
SB
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IOU#0
- Duplicated chipset and
memory writin
- Interconnect
(address bus/data bus)
duplication
Содержание PRIMEQUEST 440
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Страница 122: ...4 16 C122 B001 02EN CHAPTER 4 Hardware System Management Figure 4 9 Example of the filter condition setting screen ...
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