HP StorageWorks Clustered File System 3.6.1 Windows Storage Server Edition administration guide (AG515 - 96007, August 2008)

64
7
Configure the SAN
SAN configuration includes the following:
• Import SAN disks into the cluster.
• Deport SAN disks from the cluster.
• Display information about SAN disks.
Overview
SAN Configuration Requirements
Be sure that your SAN configuration meets the requirements specified in
the HP StorageWorks Clustered File System Setup Guide.
Storage Control Layer Module
The Storage Control Layer (SCL) module manages shared SAN devices. It
operates as a process (SCLd) running on each server in the cluster and is
created by the SANPulse process.
The primary function of the SCL module is to ensure that when a server
drops out of the cluster unexpectedly, it is physically disabled from
further access to the imported SAN storage devices. This step enables HP
Clustered File System to perform any needed filesystem recovery
operations to ensure filesystem integrity and then to continue running
safely on the remaining set of servers.
As part of managing shared SAN devices, the SCL also gives each disk a
globally unique device identifier that all servers in the cluster use to