VERITAS Volume Manager 4.1 Administrator's Guide

Chapter 2 71

See “Changing Device Naming for TPD-Controlled Enclosures” on page 78 for details of how

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

Autodiscovery of EMC Symmetric Arrays

In VxVM 4.0, there were two possible ways to conﬁgure EMC Symmetrix arrays:

• With EMC PowerPath installed, such devices could be conﬁgured as foreign devices as

described in “Adding Foreign Devices” on page 75.

• Without EMC PowerPath installed, DMP could be used to perform multipathing.

On upgrading a system to VxVM 4.1, an ASL provided by VERITAS makes information about

any existing EMC PowerPath devices available to VxVM. Such devices can be discovered by

DDL, and conﬁgured into DMP as autoconﬁgured disks with DMP nodes, even if PowerPath is

being used to perform multipathing. There is no longer any need to conﬁgure such arrays as

foreign devices.

NOTE To allow DMP to receive correct enquiry data, the Common Serial Number

(C-bit) Symmetrix Director parameter must be set to enabled.

Administering the Device Discovery Layer

Dynamic addition of disk arrays is possible because of the existence of the Device Discovery

Layer (DDL) which is a facility for discovering disks and their attributes that are required for

VXVM and DMP operations.

Administering the DDL is the role of the vxddladm utility which is an administrative

interface to the DDL. You can use vxddladm to perform the following tasks:

• List the types of arrays that are supported.

• Add support for an array to DDL.

• Remove support for an array from DDL.

• List information about excluded disk arrays.

• List the supported JBODs.

• Add JBOD support for disks from different vendors.

• Remove support for a JBOD.

The following sections explain these tasks in more detail. For further information, see the

vxddladm(1M) manual page.

Listing Details of Supported Disk Arrays

To list all currently supported disk arrays, use the following command