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Configuring your Environment for Software RAID
Configuring the Environment
Chapter 3 67
that are of identical sizes. Differences in disk set size results in a
mirror being created of a size equal to the smaller of the two disks.
Be sure to create the mirror using the persistent device names of the
component devices. For more information on creating and managing
a mirrored device, see “Creating a Multiple Disk Device” on page 72.
4. Create volume groups and logical volumes on the MD mirror device
Once the MD mirror device is created, you need to create volume
groups and logical volumes on it. You must use the Volume Group
Exclusive activation feature. This protects against a volume group
which is already active on one node to be activated again
(accidentally or on purpose) on any other node in the cluster. For
more information on creating volume groups and configuring
exclusive activation, see “Creating Volume Groups and Configuring
VG Exclusive Activation on the MD Mirror” on page 74.
5. Configure the package control script and the Extended Distance
cluster configuration script
In order to let Serviceguard know of the existence of the mirror
created in the previous step and hence make use of it, it must be
configured as part of a package. This MD device must be specified in
the Extended Distance Cluster configuration file raid.conf. Copy
the raid.conf.template in the software bundle as raid.conf to the
package directory and edit it to specify the RAID configuration
parameters for this package. Using the details mentioned in this file
Serviceguard will start, stop and monitor this MD mirror for the
package. For details on how to configure the package control script
and raid.conf see “Configuring the Package Control Script and RAID
Configuration File” on page 76.
IMPORTANT Every time you edit the raid.conf file, you must copy this edited file
to all nodes in the cluster.
6. Start the package
Starting a package configured for Software RAID is the same as
starting any other package in Serviceguard for Linux.
You also need to keep in mind a few guidelines before you enable
Software RAID for a particular package. Following are some of these
guidelines you need to follow: