Cloud Services: Elastic Volume Service Overview

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Questions and Answers

What are the advantages of Elastic Volume Service (EVS)? (Select all that apply)

Various Disk types: EVS provides a variety of disk types and EVS disks can be used as data disks and system disks for servers. (correct)

Real-time monitoring: You can monitor EVS health through the cloud Eye. (correct)

Elastic scalability: You can expand capacity on-demand and without interrupting services (correct)

High security and reliability: Both system disks and data disks support data encryption to ensure data security. Data protection functions, such as backups and snapshots, safeguard the disk data, preventing incorrect data caused by application exceptions or attacks. (correct)

In Huawei Cloud, what are the different types of EVS disk by I/O performance?

Extreme SSD, Ultra high I/O, General Purpose SSD, High I/O

Virtual Block Device (VBD) is the default EVS device type supporting basic read/write SCSI commands and advanced SCSI commands.

False (B)

What is the purpose of Shared EVS disks?

All of the above (D) Signup and view all the answers

What is the purpose of EVS encryption?

All of the above (D) Signup and view all the answers

What is the purpose of creating an EVS backup?

All of the above. (D) Signup and view all the answers

What is the purpose of creating an EVS snapshot?

Snapshotting allows you to rapidly save the disk data at specific time points and use it for recovery, creation of new disks, or rolling back to the original disk. Signup and view all the answers

How does EVS ensure data reliability?

EVS uses three-copy redundancy to ensure data reliability. Each data block is saved in three copies, and these copies are stored on different nodes, on different physical disks in the system, according to a distributed algorithm. Signup and view all the answers

What is the purpose of the storage service in the EVS data rebuild process?

When a physical server or disk fault is detected, the storage system automatically rebuilds the data. It utilizes data copies located on multiple nodes in the system, which helps to minimize the adverse impacts exerted on upper-layer applications. Signup and view all the answers

What storage service does OBS provide?

OBS provides secure, reliable, and cost-effective cloud storage for massive amounts of data. Signup and view all the answers

What are the benefits of OBS?

All of the above. (F) Signup and view all the answers

An object key is up to 64 characters long.

False (B) Signup and view all the answers

What are the two types of Metadata?

System-defined metadata (A), Custom metadata (B) Signup and view all the answers

What are the benefits of using OBS big data solutions? (Select all that apply)

All of the above. (G) Signup and view all the answers

What are the benefits of using OBS for static website hosting? (Select all that apply)

All of the above. (D) Signup and view all the answers

The storage capacity of OBS automatically scales as the volume of stored data grows.

True (A) Signup and view all the answers

What kind of data is stored in OBS?

OBS stores unstructured data of applications and databases. Signup and view all the answers

What are the benefits of Scalable File Service (SFS)? (Select all that apply)

All of the above (F) Signup and view all the answers

What type of data services benefit from SFS?

High Performance Computing (HPC), such as simulation experiments, biopharmacy, gene sequencing, image processing, and weather forecast. Signup and view all the answers

Why are media processing services more likely to be deployed on cloud platforms?

Because streaming media, archiving, editing, transcoding, content distribution, and video on demand (VOD) require a wide range of workstations all sharing files in the same file system for collaborative development and production. Signup and view all the answers

What is the purpose of Network File System (NFS)?

NFS allows different computers and operating systems to share data over a network. Signup and view all the answers

What is the purpose of Common Internet File System (CIFS)?

CIFS is a public or open version of the Server Message Block (SMB) protocol, from Microsoft. CIFS allows applications to access files on computers over the Internet and send requests for file services. Signup and view all the answers

The Portable Operating System Interface (POSIX) is specified by The Institute of Electrical and Electronics Engineers (IEEE).

True (A) Signup and view all the answers

Dynamic Host Configuration Protocol (DHCP) is a service component of Windows Server by default.

False (B) Signup and view all the answers

Study Notes

Storage Cloud Services

Elastic Volume Service (EVS) provides scalable block storage for cloud servers with high reliability and performance
Suitable for distributed file systems, development/testing, data warehousing, and high-performance computing (HPC)
EVS disks are like local hard drives, but on the cloud. They must be attached to cloud servers to be used.
EVS disks come in various types for different needs (data/system)
Offers elastic scalability: easily increase capacity on demand without service interruption
Real-time monitoring with Cloud Eye to track disk health
Data security and reliability are ensured through data encryption and backup/snapshot features

EVS Architecture

EVS disks are attached to servers using a cloud-based system
Enables creating and restoring backups
Facilitates creating snapshots for data reliability improvements

EVS Performance

IOPS (Input/Output Operations per Second): represents the read/write operations performed by an EVS disk per second. This is a performance metric.
Throughput measures the amount of data read/written per second
I/O Latency is the minimum interval between read/write operations

EVS Disk Types

Vary in performance (Extreme SSD, Ultra-high I/O, General Purpose SSD, High I/O) based on requirements.

EVS Device Types

Virtual Block Device (VBD) is the default type, supporting basic read/write commands.
Small Computer System Interface (SCSI) supporting read/write, transmission, and advanced SCSI commands.

Shared EVS Disks

Designed for multiple server attachments, offering high concurrency, high performance, and high reliability.
Useful for enterprise applications demanding high availability

EVS Encryption

Enables encryption for data stored on EVS disks
System disk encryption is built-into the server
Data disks can be separately encrypted

EVS Backup

Cloud Disk Backup provided by Cloud Backup and Recovery (CBR) enables backups of EVS disks while servers are running.
Data integrity and security from accidental deletion, virus, or software/hardware failures is guaranteed by backups.

EVS Snapshot

Useful for rapidly saving disk data at specific times.
Snapshots can be used to create new disks to include the snapshot data
Snapshots are linked to the disk data rather than copied as an independent element.

Backup vs Snapshot

Backups are copies stored separately, safe even if the original disk is damaged or deleted.
Snapshots are saved to the same disk as the data showing the status at that specific moment. If the disk is deleted, snapshots also are.

EVS Three-Copy Redundancy

Data is divided into blocks, copied and saved in three locations across different servers on different physical hardware (cabinets.)
Ensures data availability in case of hardware failure. Reduces service interruption risks

Data Rebuild

The system rebuilds data in case of failure on a disk/server
Data copies are spread across multiple servers ensuring quick recovery

Object Storage Service (OBS)

Scalable, secure, reliable, and cost-effective cloud storage for massive amounts of data.
Ideal for applications with very large datasets.
There are no limitations on capacity of data storage
Data is highly available, and backup/recovery is automatic

OBS Advantages

High durability and service continuity
Multi-level security and authorization
Large volume of data storage
Easy to use and manage
Tiered storage options for cost optimization
Data accessible from anywhere, anytime

Application Scenarios

Big Data Analytics (analysis of large datasets, historical data, etc)
Static Website Hosting (web pages, dynamic data for websites.)
Enterprise Cloud Boxes (web storage)

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Description

Explore the features and architecture of Elastic Volume Service (EVS) in cloud computing. This quiz covers key concepts such as scalability, performance metrics, and data protection mechanisms. Understand how EVS provides reliable block storage for various applications in the cloud environment.