NonStop NS-Series Operations Guide (H06.03+)

ServerNet Resources: Monitoring and Recovery
HP Integrity NonStop NS-Series Operations Guide—529869-001
7-7
Monitoring the ServerNet Fabrics Using SCF
The path from the processor in the FROM row to the processor in the TO column is
down because the processor in the TO column is down. For a processor that does
exist on your system, this status is abnormal. UNA overrides all other states.
Recovery Operations for the ServerNet Fabrics
For most recovery operations, refer to the SCF Reference Manual for the Kernel
Subsystem.
Recovery Operations for a Down Disk Due to a Fabric
Failure
When a path to a disk drive goes down due to a ServerNet fabric failure (either the
ServerNet X or Y fabric is down), the storage subsystem automatically switches the
paths of the disk drive if possible, so that the disk drive remains operational. This
switching might result in a disk drive being placed in the STOPPED state with a
substate of HARDDOWN.
You must restart any disk path that was using the fabric that went down. Otherwise the
storage subsystem never attempts to use that path, which creates a potential single
point of failure. For more information, refer to Recovery Operations for a Down Disk or
Down Disk Path on page 10-14.
Recovery Operations for a Down Path Between Processors
When the status is either DIS (disabled) or DN (down), you can restart all paths
between processors on the X fabric or Y fabric:
> SCF START SERVERNET $ZSNET.{X|Y}.*
Refer to the SCF Reference Manual for the Kernel Subsystem.
Recovery Operations for a Down Processor
If the status for an existing processor is <- DOWN or UNA, refer to Recovery
Operations for a Processor Halt on page 9-9 for more information about recovery
operations.
Recovery Operations for a File-System Error
For information about file-system errors, refer to the Guardian Procedure Errors and
Messages Manual.