CHAPTER 6 Redundancy
6.1 Redundancy
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CA92344-0534-07
Redundancy
CHAPTER 6
This section describes the redundancy configuration of components.
6.1
Redundancy
In the PRIMEQUEST 2000 series, such as the memory, I/O, transmission paths, the power supply system
and fan of the hardware configuration, most of the sections allow for redundancy, and achieve high reliability
and high availability.
6.2
Redundancy of components
For details on the components with redundancy configuration, see '3.3.1 Replaceable components' of
“
PRIMEQUEST 2000 Series Administration Manual
” (CA92344-0537)
6.3
Redundancy of HDD
This section describes the HDD redundancy in the PRIMEQUEST 2000 series.
6.3.1 Redundancy of the disk
In the PRIMEQUEST 2000 series, redundancy of system disk and data disk can be created using several
procedures.
1. The redundancy in the single volume
The redundancy in the single volume is achieved using the hardware RAID function to disk in SB, DU
within a cabinet or in an external RAID device.
2. The redundancy between multiple volumes
The redundancy of inter-volume is achieved by mirroring multiple disks with RAID0 configuration except
for RAID0 configuration in SB, DU within a cabinet or in external RAID devices by using software
mirroring such as PRIMECLUSTER GDS.
3. The redundancy between multiple redundant volumes
The redundancy of inter-volume is achieved by mirroring multiple disks with RAID configuration except
for RAID0 configuration in external RAID devices by using software mirroring such as PRIMECLUSTER
GDS.
Below table shows procedures of disk redundancy.
TABLE 6.1 System disk redundancy
# System volume
allocation
Redundancy procedure
Single volume Inter-volume
Boot path
1 Within a cabinet:
SB, DU
(RAID other
configuration
than RAID 0)
Outside a
cabinet:
External RAID
device
The redundancy in the single volume is
achieved using the hardware RAID function. The
volume is not affected even if the HDD of the
volume fails, and the system can continue
booting or running. (This excludes RAID 0
configuration)
Redundancy
is possible
Redundancy
is not possible
Redundancy
is not possible
2 Within a cabinet:
SB, DU
(RAID 0)
Outside a
cabinet:
External RAID
Although redundancy is not possible in a single
unit alone, it can be achieved by creating a
software mirroring configuration using multiple
volumes (using PRIMECLUSTER GDS and so
on). Even if a problem occurs in the volume on
one side, it is possible to continue the system
boot and system startup in the volume on the
Redundancy
is not possible
Redundancy
is possible
Redundancy
is possible
