Azure Storage Redundancy Overview
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What is the primary purpose of redundancy in Azure Storage?

  • To enable faster data retrieval
  • To reduce storage costs
  • To protect data from failures and disasters (correct)
  • To improve network performance

    • How are the redundancy settings applied in an Azure Storage account?

  • Redundancy settings can be configured independently for each region the storage account spans
  • Each storage service (Blob, File, Table, Queue) can have a different redundancy setting
  • Redundancy settings are shared across all storage services in the same storage account (correct)
  • Redundancy settings are applied at the resource level (e.g., individual blob containers)

    • What is the minimum number of copies of data maintained in the primary region for an Azure Storage account?

  • 2
  • 4
  • 1
  • 3 (correct)

    • When deciding which redundancy option to use for an Azure Storage account, what is a key factor to consider?

    <p>The trade-off between lower costs and higher availability</p> Signup and view all the answers

    Which of the following is a valid reason for isolating different types of storage resources in separate Azure Storage accounts?

    <p>To apply different redundancy settings to each storage service</p> Signup and view all the answers

    What is the primary benefit of the redundancy feature in Azure Storage?

    <p>Data protection against failures and disasters</p> Signup and view all the answers

    Which redundancy options are supported for Premium file shares?

    <p>LRS and ZRS</p> Signup and view all the answers

    What is a limitation of ZRS managed disks?

    <p>Not supported for unmanaged disks</p> Signup and view all the answers

    Which storage account types support hierarchical namespace and specified redundancy options together?

    <p>Accounts with hierarchical namespace support enabled</p> Signup and view all the answers

    Which storage account types do not support the archive tier for Blob Storage?

    <p>ZRS, GZRS, and RA-GZRS accounts</p> Signup and view all the answers

    In what scenarios are unmanaged disks not supported by Azure Storage?

    <p>For Premium file shares</p> Signup and view all the answers

    What does Azure Storage do to ensure data integrity during network traffic?

    <p>It conducts integrity verification using redundant data</p> Signup and view all the answers

    What is the level of durability offered by Geo-redundant storage (GRS) for storage resources over a given year?

    <p>99.99999999999999% (16 9's)</p> Signup and view all the answers

    Which type of storage combines high availability across availability zones with protection from regional outages?

    <p>Geo-zone-redundant storage (GZRS)</p> Signup and view all the answers

    For managed disks, which type of redundancy is supported with certain limitations?

    <p>Zone-redundant storage (ZRS)</p> Signup and view all the answers

    What kind of storage account supports Geo-zone-redundant storage (GZRS)?

    <p>Standard general-purpose v2</p> Signup and view all the answers

    During a failover from the primary to the secondary region, what happens to the secondary region?

    <p>It becomes the primary region</p> Signup and view all the answers

    What is the purpose of copying data to a secondary region that is far away from the primary one?

    <p>For disaster recovery</p> Signup and view all the answers

    Which option provides read access to data in the secondary region in case of a failover?

    <p>Read-access geo-redundant storage (RA-GRS)</p> Signup and view all the answers

    What is the main difference between Geo-redundant storage (GRS) and Geo-zone-redundant storage (GZRS)?

    <p>GZRS combines high availability across availability zones with protection from regional outages.</p> Signup and view all the answers

    What happens to data in a GZRS storage account if an availability zone becomes unavailable?

    <p>The data remains writable and readable.</p> Signup and view all the answers

    What is the recommended use case for Geo-zone-redundant storage (GZRS)?

    <p>Applications requiring maximum consistency, durability, and availability.</p> Signup and view all the answers

    What is the minimum durability guarantee provided by Locally Redundant Storage (LRS) for objects over a given year?

    <p>99.999999999% (11 nines)</p> Signup and view all the answers

    If a disaster such as fire or flooding occurs within the data center where data is stored using Locally Redundant Storage (LRS), what is the risk?

    <p>All replicas of the storage account may be lost or unrecoverable.</p> Signup and view all the answers

    What is the minimum durability guarantee provided by Zone-Redundant Storage (ZRS) for storage resources over a given year?

    <p>99.9999999999% (12 nines)</p> Signup and view all the answers

    If an availability zone becomes temporarily unavailable in a ZRS configuration, what happens to read and write operations?

    <p>Both read and write operations continue to work, with data accessible from the remaining available zones.</p> Signup and view all the answers

    Which of the following scenarios is Zone-Redundant Storage (ZRS) recommended for?

    <p>Scenarios that require high availability and resiliency within a region, but not protection against regional disasters.</p> Signup and view all the answers

    If a write operation is performed on a storage account using Zone-Redundant Storage (ZRS), when is the operation considered successful?

    <p>When the data is written to all three availability zones.</p> Signup and view all the answers

    Which of the following storage services supports Zone-Redundant Storage (ZRS) for standard general-purpose v2 storage accounts?

    <p>Azure Blobs, Azure Files, Azure Queues, and Azure Tables</p> Signup and view all the answers

    Which of the following storage account types supports Zone-Redundant Storage (ZRS) for premium block blobs?

    <p>Premium block blob storage accounts</p> Signup and view all the answers

    Which of the following statements is true regarding the archive tier for Blob Storage and Zone-Redundant Storage (ZRS)?

    <p>The archive tier is not currently supported for ZRS accounts.</p> Signup and view all the answers

    Which of the following storage resources does not support Zone-Redundant Storage (ZRS) or Geo-Zone-Redundant Storage (GZRS)?

    <p>Unmanaged disks</p> Signup and view all the answers

    What is the primary purpose of enabling geo-redundant storage (GRS or GZRS) for an Azure Storage account?

    <p>To protect against regional outages by replicating data to another physical location</p> Signup and view all the answers

    How can you access data in the secondary region when your storage account is configured for GRS or GZRS?

    <p>Data in the secondary region is only accessible for read operations after enabling RA-GRS or RA-GZRS</p> Signup and view all the answers

    What happens during the failover process when a storage account switches from the primary to the secondary region?

    <p>Your data is inaccessible during the failover process</p> Signup and view all the answers

    Which statement is true about the potential for data loss when using geo-redundant storage?

    <p>Data loss is possible due to the asynchronous replication between the primary and secondary regions</p> Signup and view all the answers

    Which Azure Storage service does not support geo-zone-redundant storage (GZRS)?

    <p>File storage (standard file shares)</p> Signup and view all the answers

    If your storage account is configured for read access to the secondary region (RA-GRS or RA-GZRS), how can your application read data from the secondary endpoint?

    <p>Append the suffix '-secondary' to the account name in the endpoint URL</p> Signup and view all the answers

    What is the purpose of enabling read access to the secondary region (RA-GRS or RA-GZRS) for a storage account?

    <p>To ensure high availability by allowing data to be read from the secondary region if the primary becomes unavailable</p> Signup and view all the answers

    What is the recommended approach for designing applications to take advantage of geo-redundancy in Azure Storage?

    <p>Design applications to seamlessly shift to reading data from the secondary region if the primary becomes unavailable</p> Signup and view all the answers

    Which statement is true about the consistency of data in the secondary region when using geo-redundant storage?

    <p>Data in the secondary region may not be fully consistent due to the asynchronous replication from the primary</p> Signup and view all the answers

    What is a key difference between geo-redundant storage (GRS) and geo-zone-redundant storage (GZRS)?

    <p>GZRS replicates data to multiple physical locations within the same secondary region</p> Signup and view all the answers

    Study Notes

    Azure Storage Redundancy

    • Azure Storage stores multiple copies of data to protect against planned and unplanned events, ensuring high availability and durability.

    Factors to Consider for Redundancy Options

    • Lower costs vs. higher availability
    • Tradeoffs between redundancy options
    • Services that comprise Azure Storage
    • Storage account represents a shared pool of storage

    Locally Redundant Storage (LRS)

    • Replicates data three times within a single data center in the primary region
    • Offers at least 99.999999999% durability of objects over a year
    • Lowest-cost redundancy option with least durability
    • Protects against server rack and drive failures, but not against disasters like fire or flooding

    Zone-Redundant Storage (ZRS)

    • Replicates data synchronously across three Azure availability zones in the primary region
    • Offers at least 99.9999999999% durability of objects over a year
    • Provides excellent performance, low latency, and resiliency
    • Suitable for scenarios requiring high availability and data governance
    • Recommended for Azure Files workloads

    Redundancy in a Secondary Region

    • Copies data to a secondary region that is hundreds of miles away from the primary region
    • Ensures data durability even in the case of a complete regional outage or disaster
    • Azure Storage offers two options for copying data to a secondary region: GRS and GZRS

    Geo-Redundant Storage (GRS)

    • Copies data synchronously three times within a single physical location in the primary region using LRS
    • Copies data asynchronously to a single physical location in a secondary region
    • Offers at least 99.99999999999999% durability of objects over a year
    • Suitable for applications requiring high durability

    Geo-Zone-Redundant Storage (GZRS)

    • Combines high availability provided by redundancy across availability zones with protection from regional outages
    • Copies data across three Azure availability zones in the primary region and replicates it to a secondary geographic region
    • Offers at least 99.99999999999999% durability of objects over a year
    • Recommended for applications requiring maximum consistency, durability, and availability

    Supported Storage Account Types

    • Standard general-purpose v2 storage accounts support all redundancy options
    • Premium block blobs accounts support ZRS
    • Premium file shares (Azure Files) support ZRS
    • Managed disks support ZRS with limitations
    • Unmanaged disks do not support ZRS or GZRS

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    Description

    Learn about Azure Storage redundancy which stores multiple copies of data to protect from various events. Understand the importance of redundancy in meeting availability and durability targets. Consider the tradeoffs between costs and availability when choosing a redundancy option.

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