HP 3PAR SUSE Linux Enterprise Implementation Guide

Setting Up Veritas DMP Multipathing
For Active/Active multipath load balancing and failover, install Veritas Storage Foundation and
High Availability Software, following the instructions provided in the Veritas Storage Foundation
installation and administrator guides, available on the following website:
Symantec
NOTE: If you are using QLogic HBAs, the QLogic non-failover driver should be installed for
Veritas DMP support.
Device-mapper (DM) multipath modules should not be configured when Veritas DMP is used for
multipathing.
Check the configuration of the Device-mapper module with chkconfig --list multipathd
and turn it off with chkconfig multipathd off.
It is required to have the Veritas Array Support Library (ASL) for the HP 3PAR StoreServ Storage
installed on the SUSE host if you are using a Veritas Storage Foundation version prior to 5.0mp3.
As of 3PAR OS 3.1.2, the virtual volume (VV) WWN increased from 8 bytes to 16 bytes. The
increase in WWN length may cause the Symantec ASL to incorrectly identify the array volume
identification (AVID) number, subsequently resulting in use of a different naming convention for
DMP disk devices.
NOTE: This issue does not occur with Storage Foundation 6.1, which is compatible with both
8-byte and 16-byte WWNs.
The standard naming convention is as follows:
<enclosure_name><enclosure_number>_<AVID>
For example:
3pardata4_5876
3pardata4_5877
3pardata4_5878
If the virtual volumes in use report a 16-byte WWN, the ASL extracts an AVID number of 0 for all
VVs, and Symantec sequentially enumerates the DMP devices to generate a unique DMP disk
name. In this case, the resulting disk names would be:
3pardata4_0
3pardata4_0_1
3pardata4_0_2
The name scheme used does not impact DMP functionality. However, if you want the DMP name
to contain the VV AVID number, Symantec provides updated ASLs that will properly extract the
AVID number. If AVID naming is desired, use the following ASL versions:
Storage Foundation 5.1 (all) 3PAR ASL version 5.1.134.100 or later
Storage Foundation 6.0 to 6.0.4 ASL version 6.0.400.100 or above
To obtain the Veritas ASL for the HP 3PAR StoreServ Storage, complete the following tasks:
1. Download the latest Veritas ASL for the HP 3PAR Storage System from the following website:
Symantec
Select 3PAR as the vendor. For ASLs for SFHA versions earlier than 5.0, see this Symantec
technical note:
Symantec
NOTE: Specific models of HP 3PAR Storage arrays may not be listed on the website, but
the ASL works on all models of HP 3PAR Storage arrays.
34 Configuring a Host with Fibre Channel