Managing Serviceguard Fifteenth Edition, reprinted May 2008

Understanding Serviceguard Software Components
Serviceguard Architecture
Chapter 3 63
Network Manager Daemon: cmnetd
This daemon monitors the health of cluster networks, and performs local
LAN failover. It also handles the addition and deletion of relocatable
package IP addresses for both IPv4 and IPv6.
Lock LUN Daemon: cmldisklockd
If a lock LUN is being used, cmdisklockd runs on each node in the
cluster and is started by cmcld when the node joins the cluster.
Utility Daemon: cmlockd
Runs on every node on which cmcld is running (though currently not
actually used by Serviceguard on HP-UX systems).
CFS Components
The HP Serviceguard Storage Management Suite offers additional
components for interfacing with the Veritas Cluster File System on some
current versions of HP-UX (see “About Veritas CFS and CVM from
Symantec” on page 29). Documents for the management suite are posted
on http://docs.hp.com.
Veritas CFS components operate directly over Ethernet networks that
connect the nodes within a cluster. Redundant networks are required to
avoid single points of failure.
The Veritas CFS components are:
• GAB (Group Membership Services/Atomic Broadcast) - When
Veritas Cluster Volume Manager (CVM) 4.1 or later, or Veritas
Cluster File System (CFS), is deployed as part of the Serviceguard
Storage Management Suite bundles, the file /etc/gabtab is
automatically configured and maintained by Serviceguard.
GAB provides membership and messaging for CVM and the CFS.
GAB membership also provides orderly startup and shutdown of the
cluster file system.
• LLT (Low Latency Transport) - When Veritas CVM or CFS is
deployed as part of the Serviceguard Storage Management Suite
bundles, the LLT files /etc/llthosts and /etc/llttab are
automatically configured and maintained by Serviceguard.
LLT provides kernel-to-kernel communications and monitors
network communications for CFS.