Hdd Redundancy; System Disk Redundancy; External Storage Redundancy; Table 6.1 System Disk Redundancy - Fujitsu PRIMEQUEST 1000 Series General Description Manual

PRIMEQUEST 1000 Series General Description
CHAPTER 6 Redundancy
6.3

HDD Redundancy

This section describes the redundancy of HDDs in the PRIMEQUEST 1000 series.
6.3.1

System disk redundancy

In the PRIMEQUEST 1000 series, redundancy can be created using several procedures, depending on the allocation
of the system volume.

TABLE 6.1 System disk redundancy

Location of allocated
system volume
Inside cabinet:
SAS array disk unit
(RAID)
Inside cabinet:
SAS disk unit
(Normal SAS)
Outside cabinet:
External RAID device
6.3.2

External storage redundancy

In the PRIMEQUEST 1000 series, redundancy of external storage containing user data can be implemented by
using the following procedure.
Redundancy procedure
Redundancy is implemented with a single volume
alone using the hardware RAID function. Even if
the HDD configuring the volume fails, the volume
is not affected, and the system can continue
booting or running. (This excludes the RAID 0
configuration.)
Redundancy, which is not possible with a single
volume alone, is made possible by creating a
software mirroring configuration using multiple
volumes (using PRIMECLUSTER GDS). If a
problem occurs with one volume, the system can
continue booting or running with another volume.
Redundancy is possible with a single volume alone
because the hardware RAID configuration is
created with an external RAID device.
Redundancy of boot paths is also possible using
the multipath configuration. Furthermore,
redundancy is made possible by creating a
software mirroring configuration using volumes in
multiple RAID cabinets (using PRIMECLUSTER
GDS).
If a problem occurs with one cabinet, the system
can boot or continue running with the other
cabinet.
Single
volume
Redundancy
possible
Redundancy
not possible
Redundancy
possible
128
Inter-volume Boot path
Redundancy Redundancy
not possible not possible
Redundancy Redundancy
possible possible
Redundancy Redundancy
possible possible
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