Command line interface (sgicm-config-cluster-cmd ).
The clulockd daemon, which stores locks on the shared partition.
The clumembd daemon, which performs network heartbeats and checks the liveliness of other members in the cluster.
The cluquorumd daemon, which computes new membership, implements quorum, enforces I/O fencing, and reads/writes membership information to the shared partition.
The clurmtabd daemon, which synchronizes NFS mount point entries by polling the /var/lib/nfs/rmtab file.
The clusvcmgrd daemon, which starts/stops and checks the status of services running in the cluster.
Messages that SGI Cluster Manager software sends between the members to request operations or distribute information to ensure that services remain highly available.
The service will not be moved to a machine that has newly joined the cluster even if the new machine is the preferred member according to the failover domain. The system administrator must manually relocate the service in order to move it back to the preferred member.
If two members cannot talk to each other, they look at the status on the shared partition disk to decide which member should survive and be part of the cluster membership. If the disk cannot be accessed or membership on the disk does not include a given machine, all SGI Cluster Manager processes on the machine exit.
A failover domain option that is considered when a member rejoins the cluster.
The process by which one member restarts the highly available applications of a failed member.
The list of members in the cluster where a service can be online.
A failover domain option that is considered when a failure occurs and a new target member for the service must be determined.
The time it takes to detect a member failure.
Graphical user interface (sgicm-config-cluster ).
The number of microseconds before a heartbeat is sent to all other members in the cluster.
Messages that SGI Cluster Manager software sends between the members that indicate a machine is up and running.
The number of heartbeats missed before a member is declared as failed.
Applications that are monitored by the SGI Cluster Manager software. If one member fails, the other member restarts the highly available applications of the failed member. To clients, the services on the replacement member are indistinguishable from the original services before failure occurred. It appears as if the original member has crashed and rebooted quickly. The clients notice only a brief interruption in the highly available service.
A full-size PCI expansion board that provides basic system I/O capabilities via the PCI bus.
System component that provides the base I/O functionality for the system; it contains the electronics and hardware necessary to boot.
SGI system controller used to monitor and manage the server.
The machine being configured.
Logical volumes that are local to one member at a time and are not shared across the cluster. They may change ownership upon failover or moving a service.
A higher preference for a service to be started on that member.
A machine or system partition that is defined as part of a cluster.
A device that provides four DB9 serial ports from a 36-pin connector.
Ensures that only the member that can contact the tiebreaker IP address can form a cluster. The tiebreaker is the IP address of a machine or a router that does not participate in the cluster. Usually, it is the IP address of a network router that connects the members to the external world (clients).
A failover domain option that causes the service to start on the first member defined if it is available.
See shared partitions and system partition.
The other member in the cluster, to which the local system controller is connected.
The set of software that allows a service to be highly available without modifying the application itself.
One of the two disk partitions without filesystems where SGI Cluster Manager keeps configuration, cluster, and service status information. See also shared partition and shadow partition.
A failover domain option that permits failover only to the members listed.
Serial ATA disk.
A number that identifies the service (the ID is automatically determined and is not user-configurable).
One of the two disk partitions without filesystems where SGI Cluster Manager keeps configuration, cluster, and service status. The shadow partition is the backup partition. See also primary partition and shared partitions .
The two disk partitions without filesystems (primary partition and shadow partition) where SGI Cluster Manager keeps configuration, cluster, and service status information.
Network partition in which both members attempt to form individual clusters.
Symbolic link
A machine that is logically divided into multiple servers. Also referred to as an Altix partition.