NonStop S-Series Operations Guide (G06.29+)

Disk Drives: Monitoring and Recovery

HP NonStop S-Series Operations Guide—522459-009

9-13

M8xxx Fibre Channel Disk Drives

The most common disk problems when Fibre Channel disk drives are connected

through an IOAM are intm-errors-exceeded and slow-IOs-threshold-exceeded errors

on the Fibre Channel loop.

Such errors are often normal. However, if they cause problems on a Fibre Channel

loop, power the affected disk down and up again. This procedure can solve the

problem temporarily.

Unless you are a qualified service provider, you cannot perform any physical actions

on these disk drives. However, operators can use OSM and SCF commands.

Recovery Operations for Disk Drives

These SCF commands control DISK objects:

For more information, see the SCF Reference Manual for the Storage Subsystem.

SCF Command Description

ABORT Terminates the operation of a disk drive immediately, leaving it in the

STOPPED state, HARDDOWN substate.

ALTER Changes attribute values for a storage device.

CONTROL Issues disk-specific commands.

PRIMARY For a disk drive, causes the backup processor to become the primary

processor and the primary processor to become the backup processor.

RENAME Changes the name of a disk drive.

RESET Puts a disk drive in a state from which it can be restarted.

START Initiates the operation of a disk drive.

STOP Terminates the operation of a disk drive in a normal manner.

SWITCH Switches paths to a disk drive.

Table 9-3. Common Recovery Operations for Disk Drives (page 1 of 3)

Problem Recovery

Free-space

fragmentation

Use the Disk Compression Program (DCOM) to consolidate disk space.

See Disk Compression Program (DCOM)

on page B-2.