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154 Administering dynamic multipathing (DMP)
Administering DMP using vxdmpadm
The disable operation fails if it is issued to a controller that is connected to the
root disk through a single path, and there are no root disk mirrors configured on
alternate paths. If such mirrors exist, the command succeeds.
Enabling I/O for paths, controllers or array ports
Note: This operation is not supported for controllers that are used to access disk
arrays on which cluster-shareable disk groups are configured.
Enabling a controller allows a previously disabled path, HBA controller or array
port to accept I/O again. This operation succeeds only if the path, controller or
array port is accessible to the host, and I/O can be performed on it. When
connecting Active/Passive disk arrays, the
enable operation results in failback
of I/O to the primary path. The
enable operation can also be used to allow I/O to
the controllers on a system board that was previously detached.
To enable I/O for a path, use the following command:
# vxdmpadm enable path=path_name
To enable I/O for the paths connected to an HBA controller, use the following
command:
# vxdmpadm enable ctlr=ctlr_name
To enable I/O for the paths connected to an array port, use one of the following
commands:
# vxdmpadm enable enclosure=enclr_name portid=array_port_ID
# vxdmpadm [-f] disable pwwn=array_port_WWN
where the array port is specified either by the enclosure name and the array port
ID, or by the array port’s worldwide name (WWN) identifier.
The following are examples of using the command to enable I/O on an array
port:
# vxdmpadm enable enclosure=HDS9500V0 portid=1A
# vxdmpadm enable pwwn=20:00:00:E0:8B:06:5F:19
Upgrading disk controller firmware
You can upgrade disk controller firmware without performing a system reboot
or unloading the VxVM drivers.
First obtain the appropriate firmware upgrades from your disk drive vendor.
You can usually download the appropriate files and documentation from the
vendor’s support website.