NT2 PREFI

Elastic Volume Service (EVS)

It offers scalable block storage for cloud servers.

distributed file system (DFS)

It is a hierarchical file system, whose physical storage resources may not be directly connected to local nodes, but connected to local nodes through compute networks

IOPS (Input/Output Operations per Second)

The number of read/write operations performed by an EVS disk per second.

Throughput

The amount of data read from and written into an EVS disk per second.

Read/write I/O latency

The minimum interval between two consecutive read/write operations on an EVS disk.

Extreme SSD

super fast disks for workloads demanding ultra-high bandwidth and ultra-low latency

Ultra-high I/O

high performance disks excellent for enterprise mission-critical services as well as workloads demanding high throughput and low latency

General Purpose SSD

cost-effective disks designed for enterprise applications with medium

performance requirements

High I/O

disks suitable for commonly accessed workloads

Virtual Block Device (VBD)

It is the default EVS device type. It supports only basic read/write SCSI commands.

Small Computer System Interface (SCSI)

EVS disks support transparent SCSI command transmission and allow the server OS to directly access the underlying storage media. 

Shared EVS Disks

These are block storage devices that support concurrent read/write operations and can be attached to multiple servers.

EVS Encryption

In case your services require encryption for the data stored on EVS disks, EVS provides you with the encryption function.

System disk encryption

are purchased along with servers and cannot be purchased separately.

Data disk encryption

It can be purchased along with servers or separately.

Cloud Disk Backup

It is provided by Cloud Backup and Recovery (CBR) and it allows you to create backups for your EVS disks while servers are running.

EVS Snapshot

You can create snapshots to rapidly save the disk data at specified time points.

Backup

It is a copy of a disk taken at a given point of time and is stored in a different location.

Snapshot

It is the state of a disk at a specific point in time and is stored on the same disk.

EVS Three-Copy Redundancy

With this mechanism, one piece of data is by default divided into multiple 1 MiB data blocks. Each data block is saved in three copies, and these copies are stored on different nodes in the system according to the distributed algorithms.

Data Rebuild

The system eliminates the potential performance bottlenecks that may occur when a large amount of data needs to be rebuilt on a single node, and therefore minimizes the adverse impacts exerted on upper-layer applications.

Object Storage Service (OBS)

It is a scalable service that provides secure, reliable, and cost-effective cloud storage for massive amounts of data.

Bucket

It is a container for storing objects in OBS.

Object

It is the fundamental storage unit in OBS.

Key

It specifies the name of an object.

Metadata

It describes an object. It is a set of key-value pairs that are assigned to objects stored in OBS.

Data

It refers to the content of an object.

System-defined metadata

It is automatically assigned by OBS for processing objects.

Custom metadata

It is used to describe the object when you upload an object to OBS.

Synchronization clients

It is good for manual backup of a single database or program

CSG

It is seamlessly compatible with on-premises backup systems

DES

It is ideal for archiving massive volumes of data.

Backup software

It is applicable to automatic backup for multiple applications or hosts, delivering strong compatibility

Scalable File Service (SFS)

It provides scalable, high-performance shared file storage.

Network File System (NFS)

It is a distributed file system protocol that allows different computers and operating systems to share data over a network.

Common Internet File System (CIFS)

It is a protocol used for network file access. It is a public or open version of the Server Message Block (SMB) protocol, from Microsoft.

file system

It provides users with shared file storage service through NFS and CIFS. It is used for accessing network files remotely.

Portable Operating System Interface (POSIX)

It is a set of interrelated standards specified by Institute of Electrical and Electronics Engineers (IEEE) to define the application programming interface (API) for software compatible with variants of the UNIX operating system.

Dynamic Host Configuration Protocol (DHCP)

It is a LAN network protocol. The server controls an IP address range, and a client can automatically obtain the IP address and subnet mask allocated by the server when logging in to the server.