6-14
C122-B001-02EN
CHAPTER 6 Redundant Configuration
6.4.2
Redundancy of external storage
Mirroring between cabinets
PRIMECLUSTER GDS supports mirroring between cabinets. This, however, does
not include the case where a disk is used as a system disk.
shows an example where mirroring between cabinets is enabled using
external SCSI ports incorporated in an IO_Unit. In this example, external SCSI ports
of the same IO_Unit are used. To improve system reliability, use external SCSI ports
of different IO_Units.
Figure 6.10 Disk device mirroring between cabinets
Path redundancy
To connect PRIMEQUEST series machines to ETERNUS3000, ETERNUS6000, or
GR series machines over multiple paths (multipaths), use the ETERNUS multipath
driver. If one of the paths in use becomes unavailable, operation is switched to
another path working normally to continue operation. When this happens, an
application can continue operation, since access is not interrupted. To improve access
performance, use all usable paths to control the load balance (distribution of load).
For details, see the manual for the ETERNUS multipath driver.
IOU
Disk Device
Disk Device
Mirroring
Ext. SCSI Port
Ext. SCSI Port
PRIMEQUEST
Summary of Contents for PRIMEQUEST 440
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