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133Administering dynamic multipathing (DMP)
Disabling and enabling multipathing for specific devices
Enabling 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.
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.