EMC 300-000-978 REV A03 Configuring VCS to, Recognize, PowerPath Volume, Manager Resources, File

		PowerPath in a Cluster Environment
Configuring VCS to	After the PowerPath Volume Manager VCS Agent has been installed
Recognize	on a host, you must configure VCS to recognize the agent. To do so,
PowerPath Volume	edit the VCS configuration file, main.cf, to include the EMCTypes.cf
Manager Resources	file.

The EMCTypes.cf file, which is installed on the host during installation of the PowerPath Volume Manager VCS Agent, defines the EMCvg resource type. The EMCvg resource type describes a PowerPath Volume Manager volume group to VCS.

Figure 2-1 shows the definition of the EMCvg resource type.

type EMCvg (

static int NumThreads = 1 static int OnlineRetryLimit = 5 static int OnlineTimeout = 300

static str ArgList[] = { VgName, OpenOption, VgRename, VgNewName, RemovePath, StorageElements, VolumeNames}

NameRule = rad_ + "$symdg_name" str VgName

str OpenOption = RW str VgRename

str VgNewName str RemovePath

str StorageElements[] str VolumeNames[]

)

Figure 2-1EMCvg Resource Type Definition

Refer to the PowerPath for UNIX Volume Manager User’s Guide for a description of the attributes in the EMCvg resource type.

EMC recommends that you leave the OnlineTimeout parameter for VERITAS Cluster Server (VCS) at the default value, 300 seconds. If the volume groups configured as EMCvg resources contain more than approximately 500 volumes, set OnlineTimeout to 600 seconds.

These values are guidelines only. The threshold for increasing the value of the OnlineTimeout parameter is highly configuration dependent, influenced primarily by the structure of the volumes. Experiment with different values to determine the optimal settings for your configuration.

PowerPath in a VERITAS Cluster Server Cluster 2-11

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