Gfs Software Subsystems - Red Hat GFS 6.0 Administrator's Manual

Chapter 1. Red Hat GFS Overview

1.4. GFS Software Subsystems

GFS consists of the following subsystems:
Cluster Configuration System (CCS)
•
Fence
•
Pool
•
LOCK_GULM
•
LOCK_NOLOCK
•
Table 1-1 summarizes the GFS Software subsystems and their components.
Software Subsystem
Cluster Configuration
System (CCS)
Fence
Components
ccs_tool
ccs_read
ccsd
ccs_servd
fence_node
fence_apc
fence_wti
fence_brocade
fence_mcdata
fence_vixel
fence_rib
fence_gnbd
fence_egenera
fence_xcat
Description
Command used to create CCS archives.
Diagnostic and testing command that is
used to retrieve information from
configuration files through
CCS daemon that runs on all cluster nodes
and provides configuration file data to
cluster software.
CCS server daemon that distributes CCS
data from a single server to ccsd daemons
when a shared device is not used for storing
CCS data.
Command used by
lock_gulmd
fence operation is required. This command
takes the name of a node and fences it
based on the node's fencing configuration.
Fence agent for APC power switch.
Fence agent for WTI power switch.
Fence agent for Brocade Fibre Channel
switch.
Fence agent for McData Fibre Channel
switch.
Fence agent for Vixel Fibre Channel switch.
Fence agent for RIB card.
Fence agent used with GNBD storage.
Fence agent used with Egenera BladeFrame
system.
Fence agent used with xCAT-managed
cluster.
7
.
ccsd
when a