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Chapter 2: Storage System Configurations
Dual-Interface/Dual-Processor Configuration
The dual-interface/dual-processor configuration has one host with two
SCSI-2 interfaces, each connected by a SCSI-2 bus to a different SP in the
storage system.
For better performance with this configuration, you can bind some physical
disk units on one SP and some other physical disk units on the other SP. The
SP that binds a physical disk unit is the default owner of that physical disk
unit.
The storage system can continue running after failure of a disk module
within a redundant RAID group. It cannot continue after a SCSI-2 interface
or an SP fails unless you manually transfer disk ownership. Table 2-3 lists
these features.
Table 2-3
Error Recovery: Dual Interface/Dual-Processor Configuration
Failing Component
Continue After
Failure?
Recovery
Disk module
Yes
Applications continue running. System operator replaces
module.
Storage-control
processor
Yes
I/O operations fail to disk units owned by a failing SP. System
operator can transfer control of the failed SP’s disk units to the
working SP, shut down the host, power off and on the storage
system, reboot the host, and, when convenient, replace the SP
and transfer control of disk units to the replacement SP.
Fan module
Yes
Applications continue running. Silicon Graphics SSE or other
authorized service provider replaces module.
Power supply
Yes
If redundant power supply module is present, applications
continue running; otherwise, storage system fails. Service
provider replaces power supply.
