NonStop S-Series Operations Guide (G06.27+)

ServerNet Fabrics: Monitoring and Recovery

HP NonStop S-Series Operations Guide—522459-008

12-6

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 9-15.

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 11-8 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.