Storix-software SBAdmin Device-Mapper Multipath Devices Manuale Utente Scaricare il pdf (Pagina 2)

Storix System Backup Administrator 2 Device-Mapper Multipath Guide

Storix is a registered trademark of Storix, Inc in the USA. SBAdmin is a trademark of Storix, Inc in the USA and other countries

SBAdmin and DM-Multipath Guide

The purpose of this guide is to provide the steps necessary to use SBAdmin in an environment where SAN

storage is used in conjunction with device-mapper multipath devices. When a system is using dm-multipath

devices, there are several considerations that need to be addressed. The device naming, tools available, and

device modules loaded become critical issues in discovery of devices and recreation of those devices upon

restore. The information in this guide should provide the necessary information to create backups from systems

using dm-multipath devices or for users who want to migrate a system backup to multipath devices. This guide

is not intended to assist users in the initial setup of dm-multipath devices. For information on initially setting up

dm-multipath devices, contact your Linux OS support vendors directly.

Requirements for DM-Multipath support

Software requirements

Support for dm-multipath devices has been available to Linux users for a few years, however, how the

devices are created and supported by distributions has changed greatly over time as the technology

matures. Below is the

minimal level of the tools and file sets that SBAdmin has tested and will support.

dm-multipath-tools version 0.4.5 (also known as device-mapper-multipath)

device-mapper version 1.02

udev version 039-10

Device detection requirements

Device naming

If you plan on creating backups from a system using dm-multipath devices, the SBAdmin software must be

able to recognize those devices prior to creating the backup. There are a number of ways your multipath

devices can be named (WWID, dm-[0-9], mpath[a-z], mpath[0-9], etc). How the devices are named depends

on three factors: The “user_friendly_names” setting in /etc/multipath.conf, aliases setup in

/etc/multipath.conf and UDEV rules.

One requirement for dm-multipath support with SBAdmin is the setting “user_friendly_names yes” in

/etc/multipath.conf.

Another requirement is a UDEV rule in place that creates a symbolic link from the device node to the device

in /dev/mpath. Some Linux distributions already create these links. If your Linux distribution does not,

SBAdmin has a sample UDEV rule that you may apply. It is designed to create the proper links and allow

SBAdmin to discovery the devices. This rule may be found as /opt/storix/config/dm_mpath_udev_rule. To

apply the rule to your system:

1. Copy the rule into place

# cp /opt/storix/config/dm_mpath_udev_rule /etc/udev/rules.d/99-storixmpath.rules

2. Trigger the UDEV rule with one of the following commands (depending on your version of UDEV)

# udevadm trigger

# udevtrigger

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