Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 2, Administering Disks

Discovering and Configuring Newly Added Disk Devices

The new disk array does not need to be already connected to the system when the

package is installed. If any of the disks in the new disk array are subsequently connected,

first run the ioscan command, and then run either the vxdisk scandisks or the

vxdctl enable command to include the devices in the VxVM device list.

Enabling Discovery of New Devices

To have VxVM discover a new disk array, use the following command:

# vxdctl enable

This command scans all of the disk devices and their attributes, updates the VxVM device

list, and reconfigures DMP with the new device database. There is no need to reboot the

host.

Note This command ensures that dynamic multipathing is set up correctly on the array.

Otherwise, VxVM treats the independent paths to the disks as separate devices,

which can result in data corruption.

Removing Support for a Disk Array

To remove support for the vrtsda disk array, use the following command:

# swremove vrtsda

If the arrays remain physically connected to the host after support has been removed, they

are listed in the OTHER_DISKS category, and the volumes remain available.

Third-Party Driver Coexistence

The third-party driver (TPD) coexistence feature of VxVM 4.1 allows I/O that is controlled

by third-party multipathing drivers to bypass DMP while retaining the monitoring

capabilities of DMP. Provided that a suitable ASL is available, devices that use TPDs can

be discovered without requiring you to set up a specification file, or to run a special

command. In previous releases, VxVM only supported TPD coexistence if the code of the

third-party driver was intrusively modified. The new TPD coexistence feature maintains

backward compatibility with such methods, but it also permits coexistence without

require any change in a third-party multipathing driver.

See “Changing Device Naming for TPD-Controlled Enclosures” on page 72 for

information on how to change the form of TPD device names that are displayed by

VxVM.

See “Displaying Information About TPD-Controlled Devices” on page 116 for details of

how to find out the TPD configuration information that is known to DMP.