User's Guide

Table 16 Multipathing software by operating system

Multipathing SoftwareOS

Windows native MPIOWindows Server 2012

Windows native MPIOWindows Server 2008 R2

HP MPIO

Windows Server 2003

device-mapperLinux

For Windows Server 2003, HP uses a specific DSM: HPMpioDSMFor3Par_Kit_Ver_1_0_23_1

After the migration preparation phase is complete, the host might need to be shut down and

reconfigured to use the native multipathing software DSM for MDM.

NOTE: For MDM, when reconfiguring a host to use the native Microsoft MPIO DSM on Windows

2008 R2 or Windows 2012, use 3PARdataVV as the device hardware ID.

When reconfiguring a host to use the native Linux device-mapper DSM, whitelist the HP 3PAR-specific

information in multipath.conf.

For more information about the multipath.conf file, see the HP 3PAR Red Hat Enterprise Linux

and Oracle Linux Implementation Guide. This document is available on the following website:

HP Storage Information Library (http://www.hp.com/go/storage/docs)

For MDM, the data transfer migration phase is then started, and the host is brought back online.

This process ensures that the host is never multipathing between the source EMC Storage system

and the destination HP 3PAR StoreServ Storage system. Even if the native multipathing software

DSM is already configured, it is necessary to restart the host after unzoning the source EMC Storage

system from the host.

IMPORTANT: If you unzone the host and EMC Storage system but do not reconfigure the host

DSM, the host/cluster will experience an outage, because it will not be able to communicate with

the destination HP 3PAR StoreServ Storage system.

Network and Fabric Zoning Requirements

Data migration requires the necessary zoning to create paths between the source and destination

storage systems and any hosts involved in the migration. The data paths used are shown in

Figure 1 (page 33).

• Two unique paths must be zoned between the source and destination storage systems. To

create two paths, the two controller ports on the source EMC Storage system must be connected

to two peer ports on the destination HP 3PAR StoreServ Storage system. See “Zoning the

Source EMC Storage to the Destination HP 3PAR StoreServ Storage System” (page 33).

• The paths between the host and the source EMC Storage system are unzoned before the

migration starts. The timing for this depends on the operating system of the host and the

migration type.

• During data migration, paths must be zoned between the host and destination HP 3PAR

StoreServ Storage system. The time at which these paths are created is determined by the

operating system of the host and the migration type.

32 Preparing for Data Migration