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FusionStorage 8.0.0 Block Storage Glossary 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).





A range of transmission frequencies that a transmission line or channel can carry in a network. In fact, it is the difference between the highest and lowest frequencies on the transmission line or channel. The greater the bandwidth is, the faster data transfers.


NIC binding is also called NIC bonding. Specifically, two or more physical NICs are bound into a virtual NIC to balance loads, achieve redundancy, and increase bandwidth. The failure of one NIC does not interrupt system services.





A physical device used for high-speed data access.

Challenge Handshake Authentication Protocol (CHAP)

A password-based authentication protocol that uses a challenge to verify that a user has access rights to a system. A hash of the supplied password with the challenge is sent for comparison so the cleartext password is never sent over the connection.

cluster authentication

Authenticates remote devices.

Cluster Configuration Database (CCDB)

A FusionStorage cluster configuration database that stores cluster configuration information.

Cluster Manager (CM)

A FusionStorage cluster management process that manages and controls cluster information.

compute node

A server where application systems run.

control cluster

A cluster formed by the control nodes of a FusionStorage system.

control node

A server that manages storage nodes.

control VM (CVM)

A VM where VBSs are deployed.

converged deployment of storage and compute resources

A deployment scheme where storage and compute resources are deployed on the same server.




data balancing

A data migration technology that distributes data evenly across all nodes in a cluster. When a node is faulty or a new node is added to a cluster, the system will balance data in the cluster.

data reconstruction

A process of restoring data saved on a faulty member disk.

data synchronization

A process of synchronizing differential data between a local volume and a remote volume.

disk usage

Percentage of used capacity in total available capacity.

distributed hash table (DHT)

A class of a decentralized distributed system that provides a lookup service similar to a hash table: (key, value) pairs are stored in a DHT, and any participating node can efficiently retrieve the value associated with a given key. Keys are unique identifiers which map to particular values, which in turn can be anything from addresses, to documents, to arbitrary data.


A process of synchronously writing host I/O requests into both local and remote volumes.




Enterprise Data Service (EDS)

A service that provides enterprise-class features for FusionStorage, such as HyperSnap (snapshot), SmartDedupe (deduplication), and HyperReplication (replication).

erasure coding (EC)

A data protection technology that divides data into N fragments and generates M parity fragments for the N data fragments. The N and M fragments are stored on different nodes to achieve superb reliability.





Enables data transmission between two sites within only one round-trip time (RTT), improving transmission efficiency.


A programmable and upgradable software part in a hardware component. It is software written into erasable read only memory (EROM) or erasable programmable read-only memory (EPROM), responsible for the elementary and basic work in the system.

forcible start

To ensure data consistency in the event that the local and remote storage systems malfunction simultaneously, HyperMetro stops hosts from accessing both of them. You can forcibly start either storage system to restore services quickly.

front-end and back-end storage using different networks

Data communication between VBSs and OSDs uses the front-end storage network and that between OSDs uses the back-end storage network.

front-end and back-end storage using one network

Data communication between OSDs as well as between VBSs and OSDs uses the same storage network.


FusionSphere software that consists of the Virtual Resource Management (VRM) and host software. It virtualizes physical resources and provides VMs for FusionSphere.

FusionSphere (FSP)

A cloud operating system developed by Huawei. It integrates a virtualization platform with cloud management features to enable easy construction and use of cloud computing platforms, and meets the cloud computing requirements of enterprises and carriers.

FusionStorage Agent (FSA)

A management agent process of FusionStorage. It is deployed on storage nodes or compute nodes to implement communication between the nodes and FSM.

FusionStorage Manager (FSM)

A management process of FusionStorage. You are advised to deploy it in active/standby mode.





A value-added active-active storage feature that enables data sets of two storage systems to provide storage services as one data set, achieving load balancing and failover without interruption.

HyperMetro consistency group

A collection of HyperMetro pairs that have a service relationship with each other.

HyperMetro domain

Consists of a local storage device, a remote storage device, and a quorum server.

HyperMetro pair

HyperMetro relationship between a local volume and a remote volume.


A value-added remote replication feature for disaster recovery and backup, as well as the basis for remote data synchronization and disaster recovery. This feature remotely maintains a data copy through the remote data connection function of storage devices that reside in different places. Even when a disaster occurs, data backups on remote storage devices are not affected.


A snapshot feature that generates a full data backup of a data warehouse cluster.


A super supervisor used for monitoring virtualization.




independent deployment of storage and compute resources

A deployment scheme where storage and compute resources are deployed on different servers.


A system component that initiates an I/O operation on an I/O bus or on a network.

inline deduplication

Deduplicates newly written data before data is saved to persistent storage media.

input/output operations per second (IOPS)

A performance indicator which specifies the number of I/O operations per second.




Kernel-based Virtual Machine (KVM)

A virtualization infrastructure for the Linux kernel.




load balancing

Adjusts the system, application components, and data to averagely distribute the applied I/Os and computing requests to physical resources of the system.

local volume

A volume on a storage device in a local data center.




main storage

A physical device which stores programs and data.

maintenance terminal

A computer that is connected to a serial port or management network port of a storage system for maintenance.

management network

Manages and maintains FusionStorage.

management node

A server where storage management software runs.

Metadata Controller (MDC)

A metadata control component of FusionStorage used for controlling distributed cluster status, data distribution rules, and data rebuilding rules.


A protection technology that stores data copies on multiple nodes to ensure data reliability.




Network Time Protocol

Defines a time synchronization mechanism and synchronizes the time between a distributed time server and a client.

network topology

A configuration or layout of a network formed by the connections between devices on one or more local area networks (LANs).




Object Storage Device (OSD)

A process that handles I/O messages from VBS, implements data redundancy protection, and stores data onto storage media. OSD automatically starts on the servers that have been added to storage pools. Each server runs only one OSD.

online analytical processing (OLAP)

A technology that uses multidimensional structures to provide rapid data access for analysis. OLAP source data is generally stored in data warehouses in a relational database. As a major application of the data warehouse system, OLAP is designed to support complex analysis, apply to decision-making personnel and senior management personnel, quickly and flexibly perform complex query and processing of a large amount of data based on the requirements of analysis personnel, and provide query results for decision-making personnel in an intuitive and easy-to-understand manner so that they can obtain accurate information about enterprise operating status, learn the demands of objects, and make correct decisions.

online transaction processing (OLTP)

A transaction-oriented processing system which immediately sends original user data to a computing center for processing and provides the processing result within a short period of time. OLTP is a main application of conventional relational databases. It processes basic and routine transactions, such as banking transactions.


An open-source cloud computing management platform that consists of multiple components. OpenStack supports almost all types of cloud environments. It aims to provide easy implementation, large-scale expansion, rich functions, and unified standards.

optimistic lock

Optimistic locks are mostly based on data version recording. A data version is a version identifier added for data. In a version solution based on database tables, data versions are implemented by adding the version field for database tables. When data is read, the version is read simultaneously. When data is updated later, the version number increases by one. In addition, the version of submitted data is compared with the current version recorded in database tables. If they are equal, data is updated. Otherwise, the data is regarded as expired data.




post-process deduplication

Deduplicates the data that has been saved to persistent storage media.

primary/secondary switchover

Switches a primary/secondary relationship.

priority switchover

During arbitration, precedence is given to the storage system which has been set as the preferred site. If the HyperMetro network is down, the storage system that wins arbitration continues providing services for hosts.




Quality of Service (QoS)

Enables a network to use various basic technologies to provide better services for specified network communication. QoS is a security mechanism used to resolve problems such as network delay and congestion.

quorum network

Enables communication between quorum servers and sites.

quorum server

A server that provides arbitration services for clusters or HyperMetro to prevent the resource access conflicts of multiple application servers.

Quorum Server Mode

Applies to scenarios where a third-party quorum server is available. In this mode, an independent physical server or a VM is used as the quorum server. You are advised to deploy a quorum server at a third-place site. You are advised to select this mode so that the quorum server still works in the event of a disaster.





A scheme of adding two or more channels, elements, or parts that have the same functions as the counterparts in the system or device at a critical place. When a fault occurs, the system or device can work well, and the reliability is then improved.

reference architecture (RA)

Software is designed based on a customized architecture. Specifically, software and hardware are integrated.

remote volume

A volume on a storage device in a remote data center.

replication cluster

A cluster formed by the replication nodes of a FusionStorage system.

replication control cluster

A cluster formed by the replication control nodes of a FusionStorage system.

replication network

Enables data transmission between sites.

replication node

A server where replication software runs.

replication service cluster

A cluster that provides replication pairs and consistency groups, as well as communication between sites.


A path that network traffic takes from its source to its destination. Routes can change dynamically.




service network

Enables communication between compute nodes and VBSs through the iSCSI protocol.

service network port

A network port used for storage services.

Simple Network Management Protocol (SNMP)

A network management protocol of TCP/IP. This protocol allows remote users to view and modify network element management information. It ensures transmission of management information between any two points. SNMP adopts the polling mechanism to provide basic function sets. According to SNMP, both hardware and software agents can monitor the activities of various devices on a network and report these activities to a network console workstation. The control information about each device is maintained by using a management information block.


A data compression feature that encodes data to take up less storage space and less bandwidth for transmission.


A data deduplication feature dedicated to eliminating coarse-grained redundant data. The feature reserves only one data copy and retains a link to the copy in the place where the data is used. Therefore, the required storage capacity is remarkably reduced.

Static Priority Mode

Applies to scenarios where no third-party quorum server is available.

storage cluster

A cluster formed by the storage nodes of a FusionStorage system.

storage network

Enables data communication between VBSs and OSDs as well as between OSDs.

storage node

A server that provides storage resources.

storage pool

A collection of storage resources provided by servers. Storage resources on multiple servers are added to a storage pool so that FusionStorage can provide distributed storage resources.

storage system

An integrated system which includes storage devices, physical connections between storage devices, and all control software.


A type of smaller networks that form a larger network according to a rule, for example, according to different districts. This facilitates the management of the large network. In a topology view, these smaller networks are called subnets.

synchronization pause

Pauses the HyperMetro or replication relationship between a local volume and a remote volume.





A system component that receives SCSI commands.

thin provisioning

Users can allocate a large amount of logical space to application servers without considering the actual physical capacity. Physical capacity is occupied only when required.




user interface

An interface where users interact with a machine.




Virtual Block Service (VBS)

A service I/O process of FusionStorage. VBS manages volume metadata and provides the distributed storage access point service through SCSI or iSCSI interfaces and enables application servers to access distributed storage resources.

virtual machine (VM)

A software simulation of a complete computer system, which runs in an independent environment and provides all hardware system functions.


Volumes are used to logically divide storage space and can be accessed by application servers. FusionStorage volumes feature thin provisioning. When a volume is created, no space is allocated to it. When a user writes data, the system dynamically allocates storage resources from a storage pool based on the capacity required by the user.

volume mapping

A storage system maps volumes to application servers so that the application servers can use storage resources.




write protected

If the status of a storage pool is write protected, the storage pool can be read but may fail to be written.




Xen Hypervisor

An open-source virtual machine monitor (VMM) based on the paravirtualization technology, used for CPU scheduling and memory allocation among VMs.




ZooKeeper (ZK)

A distributed coordination service process for applications.

Updated: 2019-08-19

Document ID: EDOC1100081414

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