HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition Administration Guide (403103-005, January 2008)

Chapter 3: Introduction to HP Clustered File System 10
writes to a PSFS filesystem automatically obtain the appropriate locks
from the DLM, ensuring filesystem coherency.
grpcommd. Manages HP Clustered File System group communications
across the cluster.
mxds. Manages the mxds datastore.
mxlogd. Manages global error and event messages. The messages are
written to the HP Clustered File System 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 SMDP process protects filesystem integrity by
ensuring that only one of the network partitions has access to the SAN.
HP Clustered File System includes the following drivers:
psd. Provides cluster-wide consistent device names among all servers.
psv. Used by the HP Clustered File System CFS Volume Manager, which
creates, extends, recreates, or destroys dynamic volumes.
Shared SAN Devices
Before a SAN disk can be used, the disk will need to be imported into the
cluster. This step gives HP Clustered File System complete and exclusive
control over access to the disk. During the import, the disk is given a
unique global device name. The servers in the cluster use this name when
they need to access the disk.