Tribblix: manual page: mpathadm.8

MPATHADM(8) Maintenance Commands and Procedures MPATHADM(8)

NAME

mpathadm - multipath discovery and administration

SYNOPSIS

mpathadm subcommand direct-object [options] [operand]

DESCRIPTION

The mpathadm command enables multipathing discovery and management.
The mpathadm command is implemented as a set of subcommands, many
with their own options, that are described in the section for that
subcommand. Options not associated with a particular subcommand are
described under OPTIONS. The mpathadm subcommands operate on a
direct-object. These are described in this section for each
subcommand. The direct-objects, initiator-port, target-port, and
logical-unit in the subcommands are consistent with SCSI standard
definitions.

The mpathadm command supports the following subcommands, which are
described in detail in subsections that follow.

list
Display a list of discovered instances for a given
object.

show
Display information about a given object instance.

modify
Modify properties of an object.

enable
Enable an object.

disable
Disable an object.

failover
Cause target port group failover for a logical-unit.

override
Set a path to be used over other paths on a logical-unit.

The mpathadm subcommands operate on a direct-object. These are
described in this section for each subcommand.

list Subcommand
The syntax for the list subcommand is:

# mpathadm list direct-object [operands...]

The list subcommand displays data for following direct-objects:

mpath-support [mpath-support-name, ...]

List the multipathing support that can be administered by this
CLI. This presents itself in the form of a library name
registered through the MPAPI framework. If no mpath-support name
mpath-support-name is specified, all registered multipathing
support libraries will be displayed.

initiator-port [initiator-port-name, ...]

List the initiator ports that are discovered on this system. If
no initiator-port-name is specified, all discovered initiator
ports are displayed.

{logical-unit | lu} [options] [logical-unit-name, ...]

List the information on multipath logical units. If no logical-
unit-name is specified, all discovered logical-units will be
displayed.

Options for list logical-unit are as follows:

-n, --name name

Return the logical unit name that is associated with the
given name string. This name can be extracted from the
output of the mpathadm show lu command.

-t, --target-port target-port-name

Return the list of logical units names that are associated
with the given target-port-name.

show Subcommand
The syntax for the show subcommand is:

# mpathadm show direct-object [operands...]

The show subcommand displays detailed information for following the
direct-objects:

mpath-support [mpath-support-name, ...]

Show the detailed information on the given mpath-support-name if
the name exists. If the given mpath-support-name supports only a
limited set of device products, the list of device products will
be listed as part of the output.

initiator-port initiator-port-name[,initiator-port-name, ...]

Show the detailed information for the given initiator-port-name.

{logical-unit | lu} [logical-unit-name, ...]

Display the detailed information on multipath logical unit(s),
including path and target port group information. Note that the
name property in the logical unit information represents the
identifier for this LUN, derived from the hardware, and used by
this system. If the name is derived from SCSI Inquiry Vital
Product Data (VPD) page 83h, the name type property represents an
associated identifier type defined by the SCSI standards.

modify Subcommand
The syntax for the modify subcommand is:

# mpathadm modify direct-object [options] [operands...]

The modify subcommand modifies characteristics of the following
direct-objects:

mpath-support [options] mpath-support-name, ...

Configuration management of an mpath-support. Options to modify
mpath-support are as follows:

-a, --autofailback on | off

Set autofailback. Applicable only when mpath-support provides
auto failback support.

-p, --autoprobe on | off

Set autoprobing. Applicable only when mpath-support provides
auto probing support.

-b, --loadbalance loadbalance-type

Change the default load balance type. The loadbalance type is
one of the supported types listed in the show mpath-support
output.

{logical-unit | lu} [options] logical-unit-name, ...

Configuration management of a logical unit. Options to modify
logical-unit are as follows:

-a, --autofailback on | off

Set autofailback. Applicable only when mpath-support provides
auto failback support

-p, --autoprobe on | off

Set autoprobing. Applicable only when mpath-support provides
auto probing support.

-b, --loadbalance loadbalance-type

Set load balance type for the logical unit. Applicable only
when load balance configuration is supported at the logical
unit level.

enable Subcommand
The syntax for the enable subcommand is:

# mpathadm disable [options]

The enable subcommand supports the following direct-objects to be
enabled:

path -i initiator-port-name -t target-port-name
-l logical-unit-name

The path that consists of the specified initiator port, target
port, and logical unit will be enabled.

disable Subcommand
The syntax for the disable subcommand is:

# mpathadm disable [options]

The disable subcommand supports the following direct-objects to be
disabled:

path -i initiator-port-name -t target-port-name
-l logical-unit-name

The path that consists of the specified initiator port, target
port, and logical unit will be disabled.

failover Subcommand
The syntax for the failover subcommand is:

# mpathadm failover direct-object [operand]

The failover subcommand supports failover for the following direct-
objects:

{logical-unit | lu} logical-unit-name

The target port group will failover when the given logical-unit
is asymmetric and supports explicit state change. The currently
active target port group will be changed to the standby state and
the standby target port group will be active.

override Subcommand
The syntax for the override subcommand is:

# mpathadm override [options]

The override subcommand controls whether or not the following direct-
objects override another:

path {-i initiator-port-name -t target-port-name | -c}
-l logical-unit-name

Cause a path that consists of the specified initiator port,
target port, and logical unit to override other paths on the
logical unit. Once a path overrides other paths, the mpath-
support uses only that path regardless of any other path
selection configuration. The -c option cancels the setting. The
path that consists of the specified initiator port, target port,
and logical unit will be disabled.

Options for override path are as follows:

-i, --initiator-port initiator-port-name

Represent the initiator port element of a path. Options -t
and -l must also be included.

-t, --target-port target-port-name

Represent the target port element of a path. Options -i and
-l must also be included.

-l, --logical-unit logical-unit

Represent the logical unit element of a path. Options -i and
-t must also be included.

-c, --cancel

Cancels overriding setting for the given logical unit. Option
-l must also be included.

OPTIONS

The following options are supported:

-V, --version
Display the version information.

-?, --help
Display context help. Can be used following an
mpathadm command with no arguments, following a
subcommand, or following a subcommand direct-object
combination. Responds with help information
appropriate for your entry. For example, if you
enter:

# mpathadm add mpath-support-help

... mpathadm responds with a display of the options
available for that combination of subcommand and
direct-object.

EXAMPLES

Example 1: Obtaining a List of Multipathing Support

The following command uses the list subcommand to list all currently
registered mpath-support libraries.

# mpathadm list mpath-support
mpath-support: libmpscsi_vhci.so

Example 2: Displaying the Properties of a Particular Multipathing

Support

The following command uses the show subcommand to display the
properties for a currently registered mpath-support library.

# mpathadm show mpath-support libmpscsi_vhci.so
mpath-support: libmpscsi_vhci.so
Vendor: Sun Microsystems
Driver Name: scsi_vhci
Default Load Balance: round-robin
Supported Load Balance Types:
round-robin
logical-block
Allows To Activate Target Port Group Access: yes
Allows Path Override: no
Supported Auto Failback Config: 1
Auto Failback: on
Failback Polling Rate (current/max): 0/0
Supported Auto Probing Config: 0
Auto Probing: NA
Probing Polling Rate (current/max): NA/NA
Supported Devices:
Vendor: SUN
Product: T300
Revision:
Supported Load Balance Types:
round-robin
Vendor: SUN
Product: T4
Revision:
Supported Load Balance Types:
round-robin

Example 3: Obtaining a List of Initiator Ports Discovered Through the

mpath-support Libraries

The following command uses the list initiator-port subcommand to
display a list of initiator ports discovered by the currently
registered mpath-support libraries.

# mpathadm list initiator-port
Initiator-Port: iqn.1986-03.com.sun:01:080020b7ac2b.437a3b3e,4000002a0000
Initiator-Port: 2000000173018713
Initiator-Port: 2000000173818713

Example 4: Displaying the Properties of a Particular Initiator Port

The following command uses the show initiator-port subcommand to
display the properties of a particular initiator port discovered
using the list initiator-port subcommand in an example above.

# mpathadm show initiator-port 2000000173018713
initiator-port: 2000000173018713
Transport Type: Fibre Channel
OS device File: devices/pci@1f,4000/pci@2/SUNW,qlca@5/fp@0,0:fc

Example 5: Displaying the Properties of a Particular Logical Unit

The following command uses the show logical-unit subcommand to
display the properties of the logical unit with the specified name.

# mpathadm show lu /dev/rdsk/c4t60003BA27D2120004204AC2B000DAB00d0s2
Logical Unit: /dev/rdsk/c4t60003BA27D2120004204AC2B000DAB00d0s2
mpath-support libmpscsi_vhci.so
Vendor: SUN
Product: T4
Revision: 0301
Name Type: SCSI Inquiry VPD Page 83 type 3
Name: 60003ba27d2120004204ac2b000dab00
Asymmetric: yes
Current Load Balance: round-robin
Logical Unit Group ID: NA
Auto Failback: on
Auto Probing: NA

Paths:
Initiator Port Name: 2000000173818713
Target Port Name: 20030003ba27d212
Override Path: NA
Path State: OK
Disabled: no

Initiator Port Name: 2000000173018713
Target Port Name: 20030003ba27d095
Override Path: NA
Path State: OK
Disabled: no

Target Port Group:
ID: 2
Explicit Failover: yes
Access State: standby
Target Ports:
Name: 20030003ba27d212
Relative ID: 0

ID: 5
Explicit Failover: yes
Access State: active
Target Ports
Name: 20030003ba27d095
Relative ID: 0

Example 6: Enabling a Path

The following command uses the enable path subcommand to enable the
path with the specified initiator port, target port, and logical
unit.

# mpathadm enable path -i 2000000173018713 -t 20030003ba27d095 \
-l /dev/rdsk/c4t60003BA27D2120004204AC2B000DAB00d0s2

Example 7: Modifying mpath-support To Turn On autofailback

# mpathadm modify mpath-support -a on libmpscsi_vhci.so

ATTRIBUTES