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

84 Administering disks
Discovering and configuring newly added disk devices
See “Changing device naming for TPD-controlled enclosures” on page 91 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 137 for details of
how to find out the TPD configuration information that is known to DMP.
Autodiscovery of EMC Symmetrix 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 88.
■ Without EMC PowerPath installed, DMP could be used to perform multipathing.
On upgrading a system to VxVM 4.1 or later release, existing EMC PowerPath 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 need to
configure such arrays as foreign devices.
To use DMP with PowerPath, you should be aware of the following scenarios:
PowerPath DMP Array mode
Installed The libvxemc ASL handles
EMC arrays and DGC claiming
internally. PowerPath handles
failover.
There is n o need to install the
Cx600 ASL or APM.
Explicit failover.
Not installed; the array is not
Cx600
DMP handles multipathing.
The libvxemc ASL handles
the EMC Symmetrix array.
Any.
Not installed; the array is
Cx600
DMP handles multipathing.
The Cx600 ASL and APM must
be installed.
Any.