Cloud Storage Services: Elastic Volume Service
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Questions and Answers

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

  • Enables expanding capacity on-demand without service interruptions. (correct)
  • Offers real-time disk health monitoring. (correct)
  • Supports data replication across regions by default.
  • Comes with built-in antivirus protection.
  • Supports data encryption for enhanced security. (correct)
  • Provides various disk types for servers. (correct)

A distributed file system allows physical storage resources to be directly connected to local nodes.

False (B)

What is the function of ECCS in the EVS architecture?

Attach EVS disks to servers.

Match the following EVS disk types with their respective performance characteristics:

<p>Extreme SSD = Super fast disks for workloads demanding ultra-high bandwidth and ultra-low latency Ultra-high I/O = High-performance disks suitable for enterprise mission-critical services, 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</p> Signup and view all the answers

Which of these options are true for EVS disks? (Select all that apply)

<p>You can create backups and snapshots for EVS disks to improve data reliability. (A), You can create a new EVS disk directly from a snapshot. (C), EVS disks are like physical hard drives on a local computer, but they are stored in the cloud. (D)</p> Signup and view all the answers

IOPS refers to the number of I/O operations performed by an EVS disk per minute.

<p>False (B)</p> Signup and view all the answers

What is the difference between EVS backups and snapshots?

<p>Backups are copies of data stored in the Object Storage Service (OBS), while snapshots are copies of the disk at a specific point in time, stored on the same disk as the original data.</p> Signup and view all the answers

EVS backups and snapshots both reside in the same Availability Zone (AZ) as their source disk.

<p>False (B)</p> Signup and view all the answers

Explain the concept of three-copy redundancy in EVS.

<p>Each data block in EVS is replicated three times and stored on different nodes within the system. This ensures data reliability and availability even if one node fails.</p> Signup and view all the answers

The storage system for EVS uses ______ redundancy to ensure data reliability.

<p>three-copy</p> Signup and view all the answers

The storage system for EVS automatically rebuilds data on multiple nodes simultaneously, reducing the potential performance bottlenecks.

<p>True (A)</p> Signup and view all the answers

What is the primary purpose of OBS (Object Storage Service)?

<p>OBS provides cost-effective and reliable cloud storage for massive amounts of data of any format.</p> Signup and view all the answers

Which of the following are features of OBS? (Select all that apply)

<p>Provides data durability of up to 99.9999999999%. (A), Support for various storage classes, including Standard, Archive, and Infrequent Access. (C), Unlimited storage capacity for objects of any format. (D)</p> Signup and view all the answers

OBS mainly consists of storage buckets and files.

<p>False (B)</p> Signup and view all the answers

What are the two types of metadata associated with objects in OBS?

<p>System-defined metadata and custom metadata.</p> Signup and view all the answers

Which of the following are scenarios where Big Data Analytics using OBS can be applied? (Select all that apply)

<p>Mass data storage and analysis for petabytes of data. (A), Analysis of social media posts for customer satisfaction. (B), Query of historical data details for account statement audit. (E)</p> Signup and view all the answers

OBS can be used to host static websites with high availability and scalability.

<p>True (A)</p> Signup and view all the answers

What does SFS stand for?

<p>Scalable File Service</p> Signup and view all the answers

Which of the following are advantages of SFS? (Select all that apply)

<p>Elastic scaling to dynamically adapt to service changes. (A), Seamless integration with both NFS and SMB protocols. (C), File sharing across different servers in the same region. (D), Supports high data durability to ensure service growth. (E)</p> Signup and view all the answers

SFS charges a fixed monthly fee for its service.

<p>False (B)</p> Signup and view all the answers

Provide an example of a scenario where SFS can be beneficial.

<p>SFS can be used in industries that require high-performance computing, such as simulation experiments, biopharmacy, gene sequencing, image processing, and weather forecasting.</p> Signup and view all the answers

Cloud services are less likely to be deployed for media processing than before.

<p>False (B)</p> Signup and view all the answers

What is the purpose of SFS in Content Management and Web Services?

<p>SFS can be used to store and provide information for websites, home directories, online releases, and archiving, enabling efficient file sharing for various organizations.</p> Signup and view all the answers

NFS is a centralized file system protocol.

<p>False (B)</p> Signup and view all the answers

What is the primary difference between CIFS and NFS?

<p>CIFS is a public or open version of the Server Message Block (SMB) protocol, developed by Microsoft, while NFS is a distributed file system protocol.</p> Signup and view all the answers

DHCP is included as a default service component in Windows Server installations.

<p>False (B)</p> Signup and view all the answers

Flashcards

Distributed File System (DFS)

A file system where physical storage might be far from the nodes.

EVS

Elastic Volume Service; scalable block storage for cloud servers.

Block Storage

Storage organized into blocks of data. EVS is a form of block storage.

Elastic Scalability

EVS allows capacity expansion without service interruptions.

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Extreme SSD

Fastest EVS disks for ultra-high bandwidth and low latency.

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Disk Types (EVS)

EVS provides various disk types like Extreme SSD, Ultra-high I/O, General Purpose SSD, High I/O

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Real-time Monitoring

Cloud Eye monitors EVS disk health in real time.

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High Security/Reliability

EVS supports data encryption and data protection features like backups and snapshots.

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IOPS

Input/Output Operations per Second; a performance metric for EVS disks.

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Throughput

Amount of data read/written per second.

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Virtual Block Device (VBD)

Default EVS device type, supports basic SCSI commands.

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I/O Latency

Time between consecutive read/write operations.

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SCSI

Small Computer System Interface; disk access method.

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Shared EVS Disks

Block storage supporting concurrent read/write by multiple servers.

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High Availability (HA)

Ensuring continuous operation even with failures.

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System Disk Encryption

Encrypts system disks, part of server. Dependent on server image selection.

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Data Disk Encryption

Encrypts data disks purchased separately or with servers. Dependent on source.

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Cloud Disk Backup

Backup service for EVS disks provided by Cloud Backup and Recovery.

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Data Disk

Disk for storing application data.

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System Disk

Disk for operating system and system files.

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Study Notes

Storage Cloud Services

  • Elastic Volume Service (EVS) is a scalable block storage service for cloud servers.
  • EVS disks are reliable and offer excellent performance.
  • EVS is suitable for distributed file systems, development/testing, data warehouses, and high-performance computing (HPC).
  • Distributed File Systems (DFS) are hierarchical file systems where physical storage isn't directly connected to nodes.

Advantages of EVS

  • Various disk types are available to suit different budgets and service needs.
  • Elastic scalability allows expanding capacity on-demand without service disruption.
  • Real-time monitoring of disk health is possible using Cloud Eye.
  • High security and reliability are ensured, including data encryption and backup/snapshot features.

EVS Architecture

  • EVS disks are like local hard drives, but in the cloud.
  • They must be attached to servers before use for persistent storage.
  • EVS disks can be initialized, file systems created, and used for storage.
  • Backups and snapshots can enhance data reliability.

EVS Performance

  • IOPS (Input/Output Operations per Second) measures read/write operations per second.
  • Throughput is data read/written per second.
  • Read/write I/O latency is the minimum interval between operations.
  • EVS disk types vary by I/O performance (e.g., Extreme SSD, General Purpose SSD).

EVS Device Types

  • Virtual Block Device (VBD) is the default device type, supporting read/write.
  • Small Computer System Interface (SCSI) supports transparent SCSI command transmission for server OS direct access.

Shared EVS Disks

  • Support concurrent read/write operations.
  • Designed for high availability (HA) with multiple servers accessing the same disk.

EVS Encryption

  • EVS supports encryption for data stored on disks.
  • System disks are encrypted during server creation.
  • Data disks can be encrypted separately.

EVS Backup

  • Cloud Disk Backup uses CBR for backing up EVS disks during operation.
  • Recovery is possible from backups in case of data loss.

EVS Snapshot

  • Snapshots rapidly save disk data at specified time points.
  • Snapshots create new disks based on snapshot data.
  • Snapshots differ from backups in creating a relationship between snapshot and disk data.

Differences Between EVS Backups and Snapshots

  • Backups are stored in OBS, ensuring data restoration if disks fail.
  • Snapshots are stored on the same disk, enabling faster restoration and preserving disk data consistency.
  • A backup and its source disk reside in different availability zones (AZs) for disaster recovery.

EVS Three-Copy Redundancy

  • Data is divided into multiple blocks and stored in three copies on different nodes for reliability.
  • This ensures service continuity even if physical disks fail.

Data rebuild

  • In case of failure, the system automatically rebuilds data from copies on other nodes.
  • This prevents performance bottlenecks when rebuilding a large amount of data.

Object Storage Service (OBS)

  • OBS is a scalable cloud storage service.
  • Useful for large amounts of data in diverse formats (e.g., videos, documents).

Application Scenarios for OBS

  • Big Data Analytics: storage and analysis of large datasets.
  • Static Website Hosting: quickly build websites or applications.
  • Enterprise Cloud Boxes: accessible, cost-effective storage for businesses.

Scalable File Service (SFS)

  • Provides shared file storage that's scalable and high-performance.
  • Suitable for scenarios requiring file sharing across multiple servers.

Advantages of SFS

  • File sharing
  • Elastic scalability
  • Superior performance and reliability
  • Seamless integration with NFS and other protocols.

Application Scenarios of SFS

  • Media processing (e.g., TV station content management.)
  • Content management: various content storage, such as office documents or web content.

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Description

Explore the features and advantages of Elastic Volume Service (EVS) for cloud storage. This quiz covers the architecture, scalability, and security aspects of EVS, providing insights into how it can be utilized for various applications such as data warehouses and high-performance computing.

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