Release Notes Device Mapper Multipath Enablement Kit for HP StorageWorks Disk Arrays (AA-RWF9B-TE, March 2008)

Over view
This release notes discusses the most recent product information about HP Device Mapper Multipath
(HPDM Multip
ath) Enablement Kit for HP StorageWorks Disk Arrays Version 4.0.0 sof tware. HPDM
Multipath so
ftware kit is an HP released Device Mapper multipath binary, based on Device Mapper
Multipath included in Linux OS distributions, with enablement for HP StorageWorks Disk Arrays. Device
Mapper is an infrastructure in the Linux kernel. It provides a generic way to create virtual layers of block
devices. It supports striping, mirroring, snapshots, concatenation, and multipathing. The multipath feature
is p rovided with combination of DM Multipath kernel modules and multipath-tools user-space pa ckage.
HPDM Multipath offers the following features:
• Detects path failure and automatically reroutes (failover) I/O to an available alternate path, if
an existi
ng connection fails
• Provides an option to perform failback of the LUN to the repaired paths
• Implements failover or failback actions transparently without disrupting applications
• Monitors
each path and notifies if the path status changes
• Facilitates I/O load balancing among the multiple paths
• Provides C LI with display options to configure and manage Multipath features
• Provide
s an option to customize names for the HPDM M u ltipath devices
• Provides device name persistence across reboots and/or SAN changes
• Provides policy-based path grouping for the user to customize the I/O flow through specific
set of paths
• Provid
es online LUN addition and deletion support
What’s New
HPDM Multipath provides the following add itional features as p art of 4.0.0 version:
• Provides support for RHEL4.5/RHEL 4 .6/RHEL 5.1/SLES 9 SP4/SLES10 SP1 along with
RHEL5/SLES9 SP3/SLESS10 OS d istributions
• Provides support for the HP StorageWorks EVA4 400 Disk Arrays
• Prov ides support for HP Stor ageW orks MSA1000/1500 Disk Arrays
• Provides support for HP StorageWorks MSA2000 Product fami ly Disk Arrays
(MSA2012fc/MSA2 212fc/MSA2012i)
• Provid es support for XP20000 / 24000 Disk Arrays
• Provi des support for EVA iSCSI devices on RHEL5/RHEL5.1/SLES9 SP3/SLES9SP4/SLES10/SLES10
SP1
Documentation Updates
The first page of this release notes document contains the following identifying information:
• V ersion number, whi c h indicates the software version .
• Da
te of Publication, which changes each time the document is updated.
Installation Notes
Installation instructions for the HP Device Mapper Multipath are documented in the installation and
reference guide for HP Device Mapper Multipath Enablement Kit for HP StorageWorks Disk Arrays
provided in Adobe Acrobat (.pdf) format.
Device Mapper Multipath Enablement Kit for HP StorageWorks D isk Arrays
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