Installation guide

• NCR UNIX MP-RAS EMPATH for EMC Disk Arrays

• NCR UNIX MP-RAS RDAC for Engenio Disk Arrays

• ONStor SDM multipath

• IBM System Storage Multipath Subsystem Device Driver (SDD)

• Accusys PathGuard

• Infortrend EonPath

• OpenVMS

• FreeBSD - GEOM_MULTIPATH and GEOM_FOX modules

• Novell NetWare

• Sun StorEdge Traffic Manager Software

• ATTO Technology multipath driver Fibreutils package for QLogic HBAs

• RDAC package for LSI disk controllers

• lpfcdriver package for Emulex HBAs

• Veritas Dynamic Multi Pathing (DMP)

• Pillar Data Systems

• Axiom Path

• iQstor MPA

Setting Up Multipathing

If you choose to use it, set up multipathing before you install Adaptive Server.

There are several multipath applications are available. Native Linux device mapper multipath

support (DM) has been added to the Linux 2.6 kernel tree with the release of 2.6.13, and has

been backported into Red Hat Enterprise Linux 4 in Update 2 and into Novell SUSE Linux

Enterprise Server 9 in Service Pack 2. To setup multipathing on Linux:

Edit the /etc/multipath.conf file by commenting out the following lines at the top

of the file. This section of the configuration file, in its initial state, blacklists all devices.

You must comment it out to enable multipathing:

blacklist {

devnode "*"

}

Run these commands:

# modprobe dm-multipath – add multipathing module to Linux kernel

# modprobe dm-round-robin – add multipathing round-robin module to

Linux kernel

# /etc/init.d/multipathd start – start multipath service

# multipath – automatically detect multiple paths to devices and

configure multipathing

# chkconfig multipathd on – turn on multipath service

# multipath –l – displays all paths to devices

The /dev/mapper/mpathN devices are persistent and they are created early in the

boot process. Therefore these are the device names that should be used to access the

multipathed devices.

CHAPTER 5: Planning Your Adaptive Server Installation

Installation Guide 35