Red Hat DEVICE-MAPPER MULTIPATH 5.2 Manual de usuario descargar pdf (Pagina 5)

DotHill – Linux Device Mapper Multipath “How To” for Storage Revision 4

Example #2:

devices {

device {

vendor "DotHill "

product "R/Evo 2730-2R"

path_grouping_policy multibus

getuid_callout "/sbin/scsi_id -g -u -s /block/%n"

}

4. Preview your multipath devices by running the following command:

# multipath -v2 -d

5. Configure the system startup scripts to start the multipathd daemon at boot time:

# chkconfig --add multipathd

# chkconfig multipathd on

6. Create your devices and start DM-MP with the two commands below. (This step is only

required the first time; on reboot it will be performed as a part of system startup.)

# multipath

# /etc/init.d/multipathd start

7. Your multipath virtual devices should now appear in the /dev/mapper directory ready for

use with names of the form mpathn.

3 Introduction

The Device Mapper is a new infrastructure in the Linux 2.6 kernel that provides a way to create

virtual block devices. These Device Mapper devices support striping, mirroring, snapshots, con-

catenation and multipathing. In this document we will discuss only the multipathing feature.

Device Mapper block devices are also supported by the Logical Volume Manager (LVM2). DM-

MP depends upon the combination of the DM-MP kernel modules and the multipath-tools user-

space package.

3.1 Features of DM-MP

DM-MP provides the following features:

• Unified View: Provides a single view of a storage resource

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Red Hat DEVICE-MAPPER MULTIPATH 5.2 Manual de usuario Pagina 5