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Document Overview
This white paper helps you understand the concepts and configuration of boot from SAN and
enabling multipath features for the Root partition on SAN in deployments using Device Mapper
multi-path. It includes recommendations for implementing and configuring operating system
installation partitions to enable the Device Mapper multipath feature on your Linux server.
Intended Audience
This document is intended for users who would be implementing the high availability features of
Boot-from-SAN and Root partition for the Linux operating system with Device Mapper multipath.
Assumptions
This document assumes that the user is familiar with the following:
• HP Fibre Channel Host Bus Adapters (HBAs) for Linux servers
• HP SAS Host Bus Adapters
• HP Smart Array Controllers
• HP StorageWorks Disk arrays
• Device Mapper multipath solution
• HP ProLiant servers
• HP ProLiant Gigabit Ethernet Multifunction server adapter
Introduction
Traditionally, servers were configured to install the operating system on internal direct attached
storage device (local disk). With advances in storage technologies, and the need for storage and
server consolidation, there is a need to enable booting from the Storage Area Network (SAN)
and providing high availability features for the operating system.
The high availability feature for the Boot device on SAN during the boot process is provided by
configuring the HBA BIOS with redundant boot paths. Many vendors refer to this feature as Boot
from SAN (BFS). For more information, see "Configuring Boot from SAN".
Linux operating system vendors have incorporated the multipathing feature for the operating
system installation partitions. For more information, see "Installing the operating system".
Supported Configuration
Device Mapper Multipath supports Boot-from-SAN operations on ProLiant and HP Integrity servers.
This functionality is specifically HBA/BIOS centric. For BFS-supported HP StorageWorks disk
arrays and HBAs, see Single Point of Connectivity Knowledge (SPOCK) at:
http://www.hp.com/storage/spock. You must sign up for a HP Passport to enable access.
High availability on installation partitions is supported by the following operating systems:
• Red Hat distribution - RHEL 5 Update 2 and above
• Novell distribution - SLES 10 SP2 and above
SLES 11 and above
Note: It is recommend to have separate devices for the /boot and root (/) partitions.
Enabling multipath features for the Installation partitions on SAN with HP Smart Array p700m
controller is supported only on SLES 10 SP2/SLES 11 operating system and above. Refer to the
product release documents for latest updates.
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