A component, residing on the , that provides end users with the ability to create rules triggered by alerts from the Veritas Provider Access Layer (VxPAL). These rules, or policies, associate certain sets of conditions with storage resources and define actions to be taken when these conditions are detected. The Action Agent is seamlessly integrated with the SF Manager so that users of the Console can monitor, define, and modify policies. Also Rule Manager.
A component (Windows service/UNIX daemon), residing on the Management Server, that retrieves and correlates SNMP and other data and sends alerts to the Action Agent for further processing using defined policies. The Alarm Service has a command-line interface - vxascmd - with which you can connect to the Alarm Service to obtain server and object information and perform various Alarm Service commands and queries.
One of several types of configurable notifications produced when an Action Agent alarm is triggered. An alert is dynamic, resetting itself automatically when a condition monitored by a policy returns to its specified CLEAR state.
The total amount of addressable storage in LUNs that is designated for use by specific hosts. A LUN is considered allocated when a host operating system has written a device handle for the LUN (in other words, claimed the LUN) or when the array has masked the LUN to a specific target.
The condition in which a constituent product or plug-in product [point product] is running on the Management Server, in conjunction with other constituent products. This is the opposite of the situation in which the product runs by itself.
Communication between clusters using either of the two core communication protocols defined by Symantec Cluster Server: GAB and LLT. The communication takes place by means of heartbeat signals sent between systems or fast kernel-to-kernel broadcasts.
A measurement representing a specific state or numerical value for objects in the storage network. The Alarm Service uses collectors to monitor and correlate status and performance information, using several different processes. The Alert Manager uses information gathered by collectors to trigger actions such as SMTP mail, Console alerts, commands, and logging.
A customizable report with which an operator can see the dependencies between the logical storage resources provided by Veritas Volume Manager and the underlying physical storage, and verify the connections to that storage as visible from various hosts on the network.
A collection of disks that share a common configuration. A disk group configuration is a set of records containing detailed information on existing Veritas Volume Manager objects (such as disk and volume attributes) and their relationships. Each disk group has an administrator-assigned name and an internally defined unique ID. The root disk group (rootdg) is a special private disk group that always exists.
A server component that provides an infrastructure and communications layer for object and cache management for many Symantec storage management products. In SF Manager the Domain Controller is installed on the Management Server. Also vxsvc.
A feature of Veritas Volume Manager designed to provide greater reliability and performance by using path failover and load balancing for multiported disk arrays connected to host systems through multiple paths. DMP detects the various paths to a disk using a mechanism that is specific to each supported array type. DMP can also differentiate between different enclosures of a supported array type that are connected to the same host system.
A feature with which administrators of multi-volume VxFS file systems can manage the placement of files on individual volumes in a volume set by defining placement policies that control both initial file location and the circumstances under which existing files are relocated. These placement policies cause the files to which they apply to be created and extended on specific subsets of a file system's volume set, known as placement classes. The files are relocated to volumes in other placement classes when they meet specified naming, timing, access rate, and storage capacity-related conditions.
A software tool that uses a unique methodology to discover information about a particular kind of resource on the storage network. In an SF Manager configuration, explorers running on both the Management Server and the managed host locate resources and discover information about them.
A collective name for the fibre optic technology that is commonly used to set up a storage area network (SAN) or virtual fabric (VSAN). A set of standards capable of transferring data between ports and through network devices at higher speeds and over significantly greater distances than SCSI technology, Fibre Channel supports point-to-point, loop, and fabric topologies.
In Veritas File System, a repository to track changes made to files in a file system. It can also contain information about file accesses (such as opens, reads, and writes) and I/O activity. FCL data is used in file placement policies to evaluate a file's activity level (access history and I/O temperature).
A means of organizing the addressable storage of one or more physical or virtual disks to give users and applications a convenient way of organizing files. File systems appear to users and applications as directories arranged in a hierarchy.
A class or collection of switches, hosts, and storage devices. Groups are useful for a number of different purposes such as meeting certain availability and redundancy requirements, or for administrative or tracking purposes.
A class or collection of network objects. Groups are useful for a number of different purposes such as meeting certain availability and redundancy requirements, or for administrative or tracking purposes. The supports two different types of groups: custom groups (user-defined collections of objects) and application groups (collections of objects determined by their common dependency on a specific application).
A common connection point for devices in the storage network. The hub may be unmanaged, IP-managed, or FC-managed. An unmanaged hub is passive in the sense that it serves simply as a conduit for data, moving the data from one storage resource to another. IP-managed and FC-managed hubs are intelligent, containing features an administrator can use to monitor the traffic passing through the hub and configure each port in the hub.
A conceptualization of the purpose of a disk or a volume. Connectivity reports in the SF Manager Console display data on intent satisfaction: a measure of how closely the storage device's actual usage aligns with its intended purpose.
An identifier for a computer or other device on a TCP/IP network, written as four eight-bit numbers separated by periods. Messages and other data are routed on the network according to their destination IP addresses.
The state in which a node is missing one of the two required heartbeat connections. When a node is running with one heartbeat only (in jeopardy), VCS does not restart the applications on a new node. This action of disabling failover is a safety mechanism that prevents data corruption.
A server component that provides object and cache management for many Symantec storage management products. In SF Manager the Local Controller can be installed on a Management Server or on a standalone host, where it also functions as a daemon for the Veritas Enterprise Administrator () Java console to connect to and manage the host. Also vxsvc.
A simple volume that resides on an extended partition on a basic disk and is limited to the space within the extended partitions. A logical volume can be formatted and assigned a drive letter, and it can be subdivided into logical drives.
A unique and discrete addressable unit or logical volume that may reside inside one or more simple or array storage devices. LUNs are exposed to the outside world through an addressing scheme presented to the host as SCSI LUN numbers. Each LUN has a unique device handle and represents a logical volume.
The creation of access paths between an addressable unit (AddrUnit) within a disk array and a port on the array. AddrUnits are storage volumes built out of the physical disks within the array. Array ports are connected to the SAN fabric and function as SCSI targets behind which the AddrUnits bound to those ports are visible.
The practice of enabling access to a particular addressable unit (AddrUnit) for a host on the storage network. This is done by creating an access control list associated with the LUN (the access path) between that AddrUnit and an array port to which it is bound. The access control list for a LUN contains the World Wide Name of each HBA port that is allowed to access that LUN within the array.
A component that assists the Management Server in discovering all of the resources in the storage network. The managed host is connected to the Management Server and consists of several agents that are also used by the Management Server.
Multiple physical access paths to a disk connected to a host system. Any software residing on the host (for example, the DMP driver) that hides multiple physical access paths from the user is said to provide multipathing functionality.
The condition that exists after all network connections between any two groups of systems fail simultaneously. When this happens, systems on both sides of the partition can restart applications from the other side resulting in duplicate services, or split-brain. A split brain occurs when two independent systems configured in a cluster assume they have exclusive access to a given resource (usually a file system or volume). The most serious problem caused by a network partition is that it affects the data on shared disks.
A single, unique addressable entity on a storage network. It is possible for objects to be present within objects. For example, while a tape array is an object, each individual tape drive within the array is also an object. A host is an object, and the HBA inside the host is also an object. Each object has one or more attributes and can be a member of one or more zones.
A class or collection of storage objects associated with applications, such as volumes and file systems. Groups are useful for a number of different purposes such as meeting certain availability and redundancy requirements, or for administrative or tracking purposes.
The route through which a host accesses data on a storage medium such as a disk in an array. The path consists of an HBA (host bus adapter) on the host, a SCSI or Fibre Channel connector, and a controller on the disk or disk array.
The physical components of a fabric, including all switches and all other SAN objects. You can configure one or more virtual fabrics - each one isolated from the others - based on the hardware components in the physical fabric.
A set of rules, or configuration settings, that are applied across a number of objects in the storage network. You establish policies to help you monitor and manage the network. Each policy associates certain sets of conditions with storage resources and defines actions to be taken when these conditions are detected.
The set of activities by which a user allocates storage to hosts and applications, for example creating LUNs in an array, setting up zoning between a host and an array, and giving the server access to the storage.
The synchronization of data between systems where shared storage is not feasible. The systems that are copied may be in local backup clusters or remote failover sites. The major advantage of replication, when compared to traditional backup methods, is that current data is continuously available.
Any of the individual components that work together to provide services on a network. A resource may be a physical component such as a storage array or a switch, a software component such as Oracle8i or a Web server, or a configuration component such as an IP address or mounted file system.
A way of classifying resources in a cluster. Each resource is identified by its name and its resource type. Veritas Cluster Server includes a set of predefined resource types for storage, networking, and application services.
Acronym for "storage area network." A network linking servers or workstations to devices, typically over Fibre Channel, a versatile, high-speed transport. The storage area network (SAN) model places storage on its own dedicated network, removing data storage from both the server-to-disk SCSI bus and the main user network. The SAN includes one or more hosts that provide a point of interface with LAN users, as well as (in the case of large SANs) one or more fabric switches and SAN hubs to accommodate a large number of storage devices.
Small Computer Systems Interface. A hardware interface that allows for the connection of multiple peripheral devices to a single expansion board that plugs into the computer. The interface is widely used to connect personal computers to peripheral devices such as disk and media drives.
A technique used to protect a cluster from a preexisting network partition. By default, when a system comes up, it is not seeded. Systems can be seeded automatically or manually. Only systems that have been seeded can run VCS. Systems are seeded automatically only when an unseeded system communicates with a seeded system or when all systems in the cluster are unseeded and able to communicate with each other.
A collection of resources working together to provide application services to clients. It typically includes multiple resources, hardware- and software-based, working together to provide a single service.
A method of mirroring volumes and qtrees on NetApp unified storage devices. With SnapMirror, a user can schedule or initiate data transfers, request information about transfers, update a mirror, and manage mirrors.
The Simple Network Management Protocol for Internet network management and communications used to promote interoperability. SNMP depends on cooperating systems that must adhere to a common framework and a common language or protocol.
In storage media managed by Veritas Volume Manager (VxVM), a set of contiguous disk blocks used for allocating disk space. A VxVM disk can be divided into one or more subdisks, each one representing a specific portion of the disk. Each portion is mapped to a specific region of a physical disk.
A prepackaged workflow shipped with SF Manager for performing tasks that otherwise would require multiple operations in multiple locations. Two examples of solutions are migrating disk groups from one host to another and storing, maintaining, and implementing storage tiers by creating and executing file placement policies.
LUNs that have not yet been allocated. A LUN is considered allocated when a host operating system has written a device handle for the LUN (in other words, claimed the LUN) or when the array has masked the LUN to a specific target.
An open systems clustering solution designed to eliminate planned and unplanned downtime, simplify server consolidation, and allow the effective management of a wide range of applications in multiplatform environments.
A cluster consisting of multiple systems connected in various combinations to shared storage devices. Veritas Cluster Server monitors and controls applications running in the cluster and can restart applications in response to a variety of hardware or software faults. A cluster is defined as all systems with the same cluster identification and connected via a set of redundant heartbeat networks. Clusters can have from one to 32 member systems, or nodes.
A set of resources working together to provide application services to clients. For example, a Web application service group might consist of: disk groups on which the Web pages to be served are stored; a volume built in the disk group; a file system using the volume; a database whose table spaces are files and whose rows contain page pointers; the network interface card or cards used to export the Web service; one or more IP addresses associated with the network card(s); the application program and associated code libraries. Veritas Cluster Server performs administrative operations on resources, including starting, stopping, restarting and monitoring at the service group level.
A Java-based graphical user interface monitoring and managing legacy (Storage Foundation 4.x) hosts in a single-host (standalone) management environment. The interface provides an alternative to the browser-based Console.
A unique IP address associated with a VCS cluster. This address can be used on any system in the cluster, along with other resources in the VCS cluster service group. A virtual IP address is different from a system's base IP address, which corresponds to the system's host name.
Representing one or more objects, services, or functions as a single abstract entity so that they can be managed or acted on collectively. An example of virtualization is the creation of a virtual fabric from a switch and associated storage resources as a means of controlling access and increasing scalability in the storage network.
In storage media managed by Veritas Volume Manager, a virtual disk made up of a portion or portions of one or more physical disks and representing an addressable range of disk blocks. A volume appears to applications, databases, and file systems like a physical disk device, but it does not have the physical limitations of a physical disk device. A volume consists of one or more plexes, each holding a copy of the selected data in the volume. Due to its virtual nature, a volume is not restricted to a particular disk or a specific area of a disk.
A component of the Veritas Storage Foundation product suite that provides high performance and online management capabilities to facilitate the creation and maintenance of file systems. A file system is a collection of directories organized into a structure that enables you to locate and store files.
A Symantec product installed on storage clients that enables management of physical disks as logical devices. It enhances data storage management by controlling space allocation, performance, data availability, device installation, and system monitoring of private and shared systems.