Administering dynamic multipathing (DMP) 133

Disabling and enabling multipathing for specific devicesEnabling or disabling controllers with shared disk groups

Prior to release 5.0, VxVM did not allow enabling or disabling of paths or controllers connected to a disk that is part of a shared Veritas Volume Manager disk group. From VxVM 5.0 onward, such operations are supported on shared DMP nodes in a cluster.

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 133.See “Enabling multipathing and making devices visible to VxVM” on page 134.Disabling multipathing and making devices invisible to VxVM

Note: Some of the operations described in this section require a reboot of the system.

1Select 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.

2Select 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.