NAME

MP_SetOverridePath - manually override a logical unit path

SYNOPSIS

cc [ flag... ] file... -lMPAPI [ library... ]
#include <mpapi.h>
MP_STATUS MP_SetOverridePath(MP_OID logicalUnitOid,


     MP_OID pathOid);

PARAMETERS

logicalUnitOid

The object ID of the multipath logical unit.

pathOid

The object ID of the path logical unit.

DESCRIPTION

The MP_SetOverridePath() function is used to manually override the path for a logical unit. The path is exclusively used to access the logical unit until cleared. Use MP_CancelOverride to clear the override.

This API allows the administrator to disable the dri ver's load balance algorithm and force all I/O operations to a specific path. The existing path weight configuration is maintained. If the administrator undoes the override (by calling MP_CancelOverridePath), the driver starts load balancing based on the weights of available paths (and target port group access state for asymmetric devices).

If the multipath logical unit is part of a target with asymmetrical access, executing this command could cause failover.

RETURN VALUES

MP_STATUS_INVALID_OBJECT_TYPE

The logicalUnitOid or pathOid does not specify any valid object type. This is most likely to happen if an uninitialized object ID is passed to the API.

MP_STATUS_INVALID_PARAMETER

The logicalUnitOid has a type subfield other than MP_OBJECT_TYPE_MULTIPATH_LU, or if pathOid has an object type other than MP_OBJECT_TYPE_PATH_LU.

MP_STATUS_OBJECT_NOT_FOUND

The logicalUnitOid, pathOid owner ID, or object sequence number is invalid.

MP_STATUS_SUCCESS

The operation is successful.

MP_STATUS_UNSUPPORTED

The implementation does not support the API.

MP_STATUS_PATH_NONOPERATIONAL

The driver cannot communicate through selected path

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Standard: ANSI INCITS 412 Multipath Management API
MT-Level	Safe