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Configuring Multipathing on Linux

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INSTALLING MPIO ON LINUX

The basic components for Linux multipathing are described below.

•

dm_multipath kernel module – Reroutes I/O, supports failover for paths & path groups.

•

mpathconf utility – Configures and enables device mapper multipathing

•

multipath command – Lists & configures multipath devices. Start with

/etc/rc.sysinit, or udev when a block device is added.

•

multipathd daemon – Monitors paths; as paths fail and come back, it may initiate path

group switches. Provides for interactive changes to multipath devices. This must be restarted

for any changes to the

/etc/multipath.conf file

•

kpartx command - Creates device mapper devices for the partitions on a device.

Use this command for DOS-based partitions with DM-MP. The

kpartx is provided in its own

package, but the device mapper-multipath package depends on it.

The basic steps for installing DM Multipath are listed here:

1. Install

device-mapper-multipath RPM.

2. On OL 6.4 or RHEL, run

mpathconf --enable to enable multipathing.

3. If necessary, edit the

multipath.conf configuration file to modify default values and save

the updated file.

4. Start the multipath daemon.

Common mpathconf Settings

Here are some common multipathing configuration settings:

mpathconf --find_multipaths y

mpathconf --with_module y

mpathconf --with_chkconfig

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Dell Acceleration Appliances for Databases Manual de usuario Pagina 55