Red Hat DEVICE-MAPPER MULTIPATH 5.2 Uživatelský manuál stáhnout pdf (Strana 8)

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

callout program. For the SANnet storage arrays it is constructed from the Logical Unit Device

Identifier on the device identification page (page 0x83 of the vital product data pages).

Alias – An alias is the name that DM-MP uses in displaying information about a multipath

device. By default, the alias is set to the WWID of the device. However, by enabling the

“

user_friendly_names” option in the multipath.conf file, the alias is set to a name of the

form mpathn. While this form of the alias is guaranteed to be unique on a host, it may not be the

same on all hosts using that multipath device, and it may change. The association between user-

friendly names and their WWIDs is cached in the file /var/lib/multipath/bindings. This file

should usually not need to be modified by hand. To ensure that the multipath devices have the

same names on all hosts accessing them this file can be propagated to all the hosts.

The alias can optionally be set to any arbitrary value in the configuration file.

5 Installing DM-MP

5.1 RedHat Linux 4

Ensure that the Device Mapper and the Multipath tools packages are installed on the system.

For RHEL4 the packages are (check for later versions):

device-mapper-1.02.25-2.e14

device-mapper-multipath-0.4.5-31.e14

You must configure the host to start the Device Mapper Multipath daemon, multipathd, at boot

time. Installing the package will not make this happen.

5.1.1 Multipath Setup

Complete the following steps on your RHEL4 host to start the multipathd daemon at boot time:

1. Run the following command to determine whether the daemon is configured to start:

# chkconfig --list multipathd

2. If is not configured, run the following commands to start the multipathd daemon during boot

time:

# chkconfig --add multipathd

# chkconfig multipathd on

For more information please see CHKCONFIG(8).

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Red Hat DEVICE-MAPPER MULTIPATH 5.2 Uživatelský manuál Strana 8