GFS kernel module on each node that communicates with the Meta Data Server and provides simultaneous access to a shared file system.
See also Meta Data Server.
A resource categorized as userApplication used to group resources into a logical collection.
A shared boundary between a service provider and the application that uses that service.
A predefined group of object definition value choices used by RMS Wizard kit to create object definitions for a specific type of application.
The part of an object definition that specifies how the base monitor acts and reacts for a particular object type during normal operations.
The procedure by which RMS automatically switches control of userApplication over to another host after specified conditions are detected.
See also directed switchover, failover, switchover, and symmetrical switchover.
Availability describes the need of most enterprises to operate applications via the Internet 24 hours a day, 7 days a week. The relationship of the actual to the planned usage time determines the availability of a system.
This PRIMECLUSTER module resides on top of the basic OS and provides internal interfaces for the CF (Cluster Foundation) functions that the PRIMECLUSTER services use in the layer above.
See also Cluster Foundation.
The RMS module that maintains the availability of resources. The base monitor is supported by daemons and detectors. Each host being monitored has its own copy of the base monitor.
linuxBMC (Baseboard Management Controller)
A dedicated processor for monitoring and diagnosis of environmental factors (e.g. temperature, voltage) and parts and units.
A resource defined in the configuration file that has at least one parent. A child can have multiple parents, and can either have children itself (making it also a parent) or no children (making it a leaf object).
See also resource, object, parent, and leaf object.
A set of computers that work together as a single computing source. Specifically, a cluster performs a distributed form of parallel computing.
See also RMS configuration.
The set of PRIMECLUSTER modules that provides basic clustering communication services.
See also base cluster foundation.
The set of private network connections used exclusively for PRIMECLUSTER communications.
The state in which communication with some of the nodes that constitute the cluster has been stopped.
Cluster Resource Management facility
Facility that manages hardware units that are shared among multiple nodes.
Concatenated virtual disks consist of two or more pieces on one or more disk drives. They correspond to the sum of their parts. Unlike simple virtual disks where the disk is subdivided into small pieces, the individual disks or partitions are combined to form a single large logical disk. (Applies to transitioning users of existing Fujitsu Technology Solutions only.)
See also simple virtual disk, striped virtual disk.
The linking of multiple physical disks. This setup allows multiple disks to be used as one virtual disk that has a large capacity.
The RMS configuration file that defines the monitored resources and establishes the interdependencies between them. The default name of this file is config.us.
Crash dump collection facility
The facility that collects crash dumps if an OS error (panic, etc.) occurs. The crash dump collection facility includes kdump.
Nodes that maintain the configuration, dynamic data, and statistics in a SIS configuration.
See also gateway node, service node, Scalable Internet Services.
A process that monitors the state of a specific object type and reports a change in the resource state to the base monitor.
The RMS procedure by which an administrator switches control of userApplication over to another host.
See also automatic switchover, failover, switchover, and symmetrical switchover.
Collection of SDX objects. The shared type disk class is also a resource unit that can be used by the PRIMECLUSTER system. A disk class is sometimes simply called a "class."
A collection of disks or low-order groups that become the unit for mirroring, striping, or concatenation. Disk and low-order groups that belong to the same disk group are mutually mirrored, striped, or concatenated according to the type attribute (mirror, stripe, or concatenation) of that disk group.
A disk group is sometimes simply called a "group."
A node state that indicates that the node is unavailable (marked as down). A LEFTCLUSTER node must be marked as DOWN before it can rejoin a cluster.
See also UP, LEFTCLUSTER, node state.
The process of detecting an error. For RMS, this includes initiating a log entry, sending a message to a log file, or making an appropriate recovery response.
LAN standard that is standardized by IEEE 802.3. Currently, except for special uses, nearly all LANs are Ethernets. Originally the expression Ethernet was a LAN standard name for a 10 megabyte per second type LAN, but now it also used as a general term that includes high-speed Ethernets and gigabyte Ethernets.
Event Notification Services (CF)
This PRIMECLUSTER module provides an atomic-broadcast facility for events.
The process by which a user application automatically transfers processes and data inherited from an operating system to a standby system because some failure has occurred.
With SIS, this process switches a failed node to a backup node. With RMS, this process is known as switchover.
See also automatic switchover, directed switchover, switchover, symmetrical switchover.
One of the LAN duplexing modes presented by GLS.
This mode uses a multiplexed LAN simultaneously to provide enhanced communication scalability between Linux(R) servers and high-speed switchover if a LAN failure occurs.
A network with the ability to withstand faults (fault tolerant). Fault tolerant is the ability to maintain and continue normal operation even if a fault occurs in part of the computer system. A fault tolerant network is therefore a network that can continue normal communication even if a flat occurs in part of the network system.
Gateway nodes have an external network interface. All incoming packets are received by this node and forwarded to the selected service node, depending on the scheduling algorithm for the Service.
See also service node, database node, Scalable Internet Services.
See disk group.
An object type which has generic properties. A generic type is used to customize RMS for monitoring resources that cannot be assigned to one of the supplied object types.
See also object type.
A local file system that features high-speed file access and file system switchover after a system failure. High-speed file access is available through the serial block allocation to file data, and file system switchover is assured through a file system consistency recovery function.
A GFS local file system is used by one node or by two nodes, in which case the file system is used as a switchover file system.
A shared file system that allows simultaneous access from multiple Linux(R) systems that are connected to shared disk units, while maintaining data consistency, and allows processing performed by a node to be continued by other nodes even if the first node fails.
A GFS shared file system can be mounted and used concurrently from multiple nodes.
This optional product provides volume management that improves the availability and manageability of information stored on the disk unit of the Storage Area Network (SAN).
This optional product provides direct, simultaneous accessing of the file system on the shared storage unit from two or more nodes within a cluster.
This PRIMECLUSTER optional module provides network high availability solutions by multiplying a network route.
A computer interface with windows, icons, toolbars, and pull-down menus that is designed to be simpler to use than the command-line interface.
This concept applies to the use of redundant resources to avoid single points of failure.
Group that does not belong to another group. A volume can be created in the highest-order group.
A numeric address that can be assigned to computers or applications.
See also IP aliasing.
internode communication facility
Communication function between cluster nodes that are used by PRIMECLUSTER CF. Since this facility is designed especially for communication between cluster nodes, the overhead is less than that of TCP/IP, and datagram communication services that also guarantee the message arrival sequence can be carried out.
This enables several IP addresses (aliases) to be allocated to one physical network interface. With IP aliasing, the user can continue communicating with the same IP address, even though the application is now running on another host.
See also Internet Protocol address.
A word that has special meaning in a programming language. For example, in the configuration file, the keyword node identifies the kind of definition that follows.
Time interval from when a data transmission request is issued until the actual response is received.
A bottom object in a system graph. In the configuration file, this object definition is at the beginning of the file. A leaf object does not have children.
A node state that indicates that the node cannot communicate with other nodes in the cluster. That is, the node has left the cluster. The purpose for the intermediate LEFTCLUSTER state is to avoid the network partition problem.
See also UP, DOWN, network partition, node state.
The file that contains a record of significant system events or messages. The base monitor, wizards, and detectors can have their own log files.
General term for a virtual disk device that the user can access directly. The user can access a logical volume in the same way as accessing a physical disk slice (partition). A logical volume is sometimes simply called a "volume." low-order group (GDS)
Group that belongs to another group. A volume cannot be created in a low-order group.
Address that identifies the office or node that is used by the MAC sublayer of a local area network (LAN).
GFS daemon that centrally manages the control information of a file system (meta-data).
A volume that is created in a mirror group. Data redundancy is created by mirroring.
A disk group of the mirror type. This a collection of mutually mirrored disks or low-order groups.
A setup that maintains redundancy by writing the same data to multiple slices. Even if an error occurs in some of the slices, this setup allows access to the volume to continue as long as a normal slice remains.
Component that monitors the state of a remote cluster node and immediately detects if that node goes down. This component is separate from the SA function.
The part of an operating system that is always active and translates system calls into activities.
This condition exists when two or more nodes in a cluster cannot communicate over the interconnect; however, with applications still running, the nodes can continue to read and write to a shared device, compromising data integrity.
LAN duplexed mode that is provided by GLS. The duplexed NIC is used exclusively, and LAN monitoring between the Linux(R) server and the switching HUB, and switchover if an error is detected are implemented.
Every node in a cluster maintains a local state for every other node in that cluster. The node state of every node in the cluster must be either UP, DOWN, or LEFTCLUSTER.
See also UP, DOWN, LEFTCLUSTER.
In the configuration file or a system graph, this is a representation of a physical or virtual resource.
See also leaf object, object definition, node state, object type.
An entry in the configuration file that identifies a resource to be monitored by RMS. Attributes included in the definition specify properties of the corresponding resource. The keyword associated with an object definition is object.
See also attribute, object type.
A category of similar resources monitored as a group, such as disk drives. Each object type has specific properties, or attributes, which limit or define what monitoring or action can occur. When a resource is associated with a particular object type, attributes associated with that object type are applied to the resource.
See also generic type.
The capability of adding, removing, replacing, or recovering devices without shutting or powering off the host.
operating system dependent (CF)
This module provides an interface between the native operating system and the abstract, OS-independent interface that all PRIMECLUSTER modules depend upon.
Oracle Parallel Server allows access to all data in the database to users and applications in a clustered or MPP (massively parallel processing) platform.
An object in the configuration file or system graph that has at least one child.
See also child, configuration file, and system graph.
IP address that is assigned directory to the interface (for example, hme0) of a network interface card. See also logical IP address. For information about the logical interface, see the explanation of logical interface in ifconfig(1M).
A server configured with actual hardware. This is used in contrast with a virtual machine, and is also referred to as a physical server.
The default host on which a user application comes online when RMS is started. This is always the hostname of the first child listed in the userApplication object definition.
Service modules that provide services and internal interfaces for clustered applications.
Private network addresses are a reserved range of IP addresses specified by RFC1918. They may be used internally by any organization but, because different organizations can use the same addresses, they should never be made visible to the public internet.
A resource accessible only by a single host and not accessible to other RMS hosts.
See also resource, shared resource.
State in which integrity is maintained among the nodes that configure the cluster system. Specifically, the CF state in all nodes that configure the cluster system is either UP or DOWN (there is no LEFCLUSTER node).
This is the capability of one object to assume the resource load of any other object in a cluster, and the capability of RAID hardware and/or RAID software to replicate data stored on secondary storage devices.
Reliant Monitor Services (RMS)
The package that maintains high availability of user-specified resources by providing monitoring and switchover capabilities.
A message that a detector uses to report the state of a particular resource to the base monitor.
A hardware or software element (private or shared) that provides a function, such as a mirrored disk, mirrored disk pieces, or a database server. A local resource is monitored only by the local host.
See also private resource, shared resource.
Database that manages information on hardware units that are shared among multiple nodes.
The resource database is managed by the cluster resource management facility.
A configuration in which two or more nodes are connected to shared resources. Each node has its own copy of operating system and RMS software, as well as its own applications.
Each component of the RMS Wizard Kit adds new menu items to the RMS Wizard Tools for a specific application.
See also RMS Wizard Tools, Reliant Monitor Services (RMS).
A software package composed of various configuration and administration tools used to create and manage applications in an RMS configuration.
See also RMS Wizard kit, Reliant Monitor Services.
Update method used to fix an application or maintenance within the cluster system. Fix application is enabled by applying fixes to each node sequentially without stopping jobs.
In the PRIMECLUSTER Concepts Guide, this term refers to the individual network paths of the redundant cluster interfaces that connect the nodes to each other.
Shutdown Agent. SA forcibly stops the target node by receiving instructions from the Shutdown Facility.
The ability of a computing system to dynamically handle any increase in work load. Scalability is especially important for Internet-based applications where growth caused by Internet usage presents a scalable challenge.
Scalable Internet Services (SIS)
Scalable Internet Services is a TCP connection load balancer, and dynamically balances network access loads across cluster nodes while maintaining normal client/server sessions for each connection.
A shell program executed by the base monitor in response to a state transition in a resource. The script may cause the state of a resource to change.
General term for disks that GDS manages. Depending on its use, a SDX disk may be called a single disk, a keep disk, a spare disk, or an undefined disk. An SDS disk is sometimes simply called a "disk."
General term for resources that GDS manages. The resources include classes, groups, SDX disks, and volumes.
Service nodes provide one or more TCP services (such as FTP, Telnet, and HTTP) and receive client requests forwarded by the gateway nodes.
See also database node, gateway node, and Scalable Internet Services.
shared disk connection confirmation
Function that checks whether that all shared disk units are turned on and all cable connections are correct when a node is started.
A resource, such as a disk drive, that is accessible to more than one node.
See also private resource, resource.
A facility that forcibly stops a node in which a failure has occurred. When PRIMECLUSTER decides that system has reach a state in which the quorum is not maintained, it uses the Shutdown Facility (SF) to return the cluster system to the quorum state.
Simple virtual disks define either an area within a physical disk partition or an entire partition.
See also concatenated virtual disk, striped virtual disk.
SDX disk that does not belong to a group and can be used to create a single volume.
A volume that is created in a single disk that not belong to a group. There is no data redundancy.
The state transition procedure receives a state transition instruction from the cluster control and controls activation and deactivation of the resource (start and stop of the application).
The high-speed network that connects multiple, external storage units and storage units with multiple computers. The connections are generally fiber channels.
A disk group of the stripe type. This is a collection of disks or low-order groups that become striping units.
Striped virtual disks consist of two or more pieces. These can be physical partitions or further virtual disks (typically a mirror disk). Sequential I/O operations on the virtual disk can be converted to I/O operations on two or more physical disks. This corresponds to RAID Level 0 (RAID0).
See also concatenated virtual disk, simple virtual disk.
A volume that is created in a striped group. Striping allows the I/O load to be distributed among multiple disks. There is no data redundancy.
Dividing data into fixed-size segments, and cyclically distributing and writing the data segments to multiple slices. This method distributes I/O data to multiple physical disks and issues I/O data at the same time.
The process by which a user application transfers processes and data inherited from an operating node to a standby node, based on a user request.
The process by which RMS switches control of userApplication over from one monitored host to another.
See also automatic switchover, directed switchover, failover, and symmetrical switchover.
This means that every RMS host is able to take on resources from any other RMS host.
See also automatic switchover, directed switchover, failover, and switchover.
When the power of one node is turned in the cluster system configured with PRIMEPOWER, this function turns on all other powered-off nodes and disk array unit that are connected to nodes through RCI cables.
A visual representation (a map) of monitored resources used to develop or interpret the configuration file.
See also configuration file.
A node state that indicates that the node can communicate with other nodes in the cluster.
See also DOWN, LEFTCLUSTER, node state.
A group that limits the environment setup, operation management, and other operations presented by Web-Based Admin View and the Cluster Admin GUI. There are four user groups: wvroot, clroot, cladmin, and clmon. Each user ID is registered in an appropriate user group by the operation system administrator of the management server.
Virtual IP address or host name that SIS uses to make multiple nodes of the cluster appear as a single-system image.
This is a common base enabling use of the Graphic User Interface of PRIMECLUSTER. This interface is in Java.
An interactive software tool that creates a specific type of application using pretested object definitions. An enabler is a type of wizard.
