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

Storage Area Network (SAN). The SAN includes Fibre Channel switches and RAID
subsystems. Disks in a RAID subsystem are imported into the cluster and managed
from there. After a disk is imported, you can create PSFS filesystems on it.
Software components
The Matrix Server software is installed on each server in the cluster. It includes kernel
modules such as the PSFS filesystem, as well as several processes and drivers.
Matrix Server also includes a Management Console that provides a graphical interface
for configuring the cluster and monitoring its operation. The console can be run either
remotely or from any server in the cluster.
Following are some of the processes provided with Matrix Server:
ClusterPulse. Monitors the cluster, controls failover of virtual hosts and devices, handles
communications with the Management Console, and manages device monitors,
service monitors, and event notification.
Distributed Lock Manager (DLM). Provides a locking mechanism to coordinate server
access to shared resources in the cluster. All reads and writes to a PSFS filesystem
automatically obtain the appropriate locks from the DLM, ensuring filesystem
coherency.
grpcommd. Manages Matrix Server group communications across the cluster.
mxds. Manages the mxds datastore.
mxlogd. Manages global error and event messages. The messages are written to
the Matrix Server event log on each server.
PanPulse. Selects and monitors the network to be used for the administrative network,
verifies that all hosts in the cluster can communicate with each other, and detects any
communication problems.
SANPulse. Provides the cluster infrastructure for management of the SAN. SANPulse
coordinates filesystem mounts, unmounts, and crash recovery operations.
SCL. Manages shared storage devices. The SCL has two primary responsibilities:
assigning device names to shared disks when they are imported into the cluster, and
enabling or disabling a server’s access to shared storage devices.
SDMP. Arbitrates and ensures that only one cluster has access to shared SAN devices.
If a problem causes a cluster to split into two or more network partitions, the SDMP
process protects filesystem integrity by ensuring that only one of the network partitions
has access to the SAN.
Matrix Server includes the following drivers:
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