User Guide

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Failing
component
Continue after
failure? What happens and how to recover
Disk module Yes Provides the same features as the basic configuration but with
better performance and higher availability. With RAID of any
level supported by MPE/iX, applications continue running.
System Administrator or service provider replaces module.
SP Yes If one SP fails, the System Administrator can access the LUNs
owned by the failed SP by accessing the remaining
operational SP with the other host. If a host adapter fails, the
System Administrator can access the LUNs in the array with
the other host adapter. The System Administrator must
change the path and SP ownership of the LUNs for the failed
SP or failed host adapter by using SYSGEN and ioconfig,
respectively. There is no automatic transfer of LUN ownership
or path for this configuration type.
Fan failure
within fan pack
Yes Applications continue running. System Administrator or
service provider replaces module.
Power supply Yes If a redundant power supply module is present, applications
continue running; otherwise, disk array fails. Service provider
replaces power supply and System Administrator restarts the
operating system, if necessary.
SCSI-2 adapter/
cable
No* I/O operations fail to all physical disk units configured on SP
attached to a failed SCSI-2 adapter/cable. System
Administrator can transfer control to the other SP by changing
host(s) and array configurations.