Managing Serviceguard 11th Edition, Version A.11.16, Second Printing June 2004

Understanding Serviceguard Software Components
Serviceguard Architecture
Chapter 360
important that user processes should have a lower priority than 20,
otherwise they might prevent Serviceguard from updating the kernel
safety timer, thus causing the node to undergo a TOC.
Syslog Log Daemon: cmlogd
cmlogd is used by cmcld to write messages to syslog. Any message
written to syslog by cmcld it written through cmlogd. This is to prevent
any delays in writing to syslog from impacting the timing of cmcld.
Cluster Logical Volume Manager Daemon: cmlvmd
This daemon is responsible for keeping track of all the volume group(s)
that have been made cluster aware. When a volume group is made
cluster aware, a cluster node can only activate it in exclusive mode. This
prevents the volume group from being activated in write mode by more
than one node at a time.
Cluster Object Manager Daemon: cmomd
This daemon is responsible for providing information about the cluster to
clients—external products or tools such as Serviceguard Manager that
depend on knowledge of the state of cluster objects. Clients send queries
to the object manager and receive responses from it. This daemon may
not be running on your system; it is used only by clients of the object
manager.
cmomd accepts connections from clients, and examines queries. The
queries are decomposed into categories (of classes) which are serviced by
various providers. The providers gather data from various sources,
including, commonly, the cmclconfd daemons on all connected nodes,
returning data to a central assimilation point where it is filtered to meet
the needs of the exact client query. This daemon is started by inetd(1M).
There are entries in the /etc/inetd.conf file.
Cluster SNMP Agent Daemon: cmsnmpd
This daemon is used by the Serviceguard graphic interface (Serviceguard
Manager) to obtain information about the cluster. This daemon produces
the Cluster MIB. Details on the cluster MIB can be found on URL
http://docs.hp.com/hpux/ha under the Frequently Asked Questions area.