4.1.0 HP PolyServe Matrix Server administration guide (T5392-96073, October 2010)

6 Configure the SAN
SAN configuration includes the following:
• Import or deport SAN disks. After a disk is imported, it can be used for PSFS
filesystems.
• Change the partitioning on SAN disks.
• Display information about SAN disks.
Overview
SAN configuration requirements
Be sure that your SAN configuration meets the requirements specified in the HP
PolyServe Matrix Server installation 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 Matrix Server 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 is also responsible for providing
each disk with a globally unique device name that all servers in the cluster can use
to access the device. Although the identifiers (such as psd2 or psd2p6) appear on
certain PolyServe Management Console windows, they are generally only needed
for internal use by Matrix Server.
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