Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

127Administering dynamic multipathing (DMP)
Disabling and enabling multipathing for specific devices
Disabling and enabling multipathing for specific devices
You can use vxdiskadm menu options 17 and 18 to disable or enable multipathing. These
menu options also allow you to exclude or exclude devices from the view of VxVM.
See “Disabling multipathing and making devices invisible to VxVM” on page 127.
See “Enabling multipathing and making devices visible to VxVM” on page 128.
Disabling multipathing and making devices invisible to VxVM
Note: Some of the operations described in this section require a reboot of the system.
1 Select menu task 17 (
Prevent multipathing/Suppress devices from
VxVM’s view
) from the vxdiskadm main menu to prevent a device from being
multipathed by the VxVM DMP driver (vxdmp), or to exclude a device from the
view of VxVM. You are prompted to confirm whether you want to continue.
2 Select the operation you want to perform from the displayed list:
1 Suppress all paths through a controller from VxVM’s view
2 Suppress a path from VxVM’s view
3 Suppress disks from VxVM’s view by specifying a VID:PID
combination
4 Suppress all but one paths to a disk
5 Prevent multipathing of all disks on a controller by VxVM
6 Prevent multipathing of a disk by VxVM
7 Prevent multipathing of disks by specifying a VID:PID
combination
8 List currently suppressed/non-multipathed devices
? Display help about menu
?? Display help about the menuing system
q Exit from menus
Help text and examples are provided onscreen for all the menu items.
◆ Select option 1 to exclude all paths through the specified controller from the view of
VxVM. These paths remain in the disabled state until the next reboot, or until the
paths are re-included.
◆ Select option 2 to exclude specified paths from the view of VxVM.
◆ Select option 3 to exclude disks from the view of VxVM that match a specified
Vendor ID and Product ID.
◆ Select option 4 to define a pathgroup for disks that are not multipathed by VxVM. (A
pathgroup explicitly defines alternate paths to the same disk.) Only one path is made
visible to VxVM.
◆ Select option 5 to disable multipathing for all disks on a specified controller.