Azure Classroom Series – 27/Aug/2020

How to create Disks in Azure

  • Azure provides two major ways of creating Disks
    • Azure Storage Account: This helps in creating un-managed disks (Which is not recommended)
    • Azure Managed Disks
  • Lets look at Azure Storage Account options later

Terms

  • IOPS: IOPS measures number of read and write operations per second on the disk
  • Throughput: measures number of bits read or write per second.
  • For SSD disks 1 IOPS = 256 Kib/S

Azure Managed disks

  • Azure Managed disks are block-level storage volumes managed by azure & they are used with Azure VMs.

  • Types of disks:

    • Ultra disks
    • premium SSD
    • Standard SSD
    • Standard HDD
  • Ultra disks:

    • Azure ultra disks deliver high throughput, high IOPS & low latency disk storage for Azure VMs.
    • Ultra disks are used in data intensive workloads top tier databases, transaction-heavy workloads.
    • Ultra disks can be used only as data disks not as Os disks.
    • Max disk size: 65536 GiB
    • Max throughput: 2000 MB/s
    • Max IOPS: 160000
    • Disk Sizes: Ultra disks come with fixed sizes, ranging from 4 GiB to 64 TiB.
  • Premium SSD:

    • This can be used as OS disk & Data Disk.
    • Deliver high performance, low latency support for VMS
    • I/O -intensive workloads is where this disk type is preferred.
    • Max Disk Size: 32767 GiB
    • Max throughput: 900 MB/s
    • Max IOPS: 20000
    • Premium ssd can be used only with few vm sizes. Any vm size which ends with s like B1s, B2s etc
    • Refer Here for official docs
  • Standard SSD:

    • Cost effective SSD solution optimized for consistent performance for Azure VMs
    • Max Disk Size: 32767 GiB
    • Max throughput: 750 MB/s
    • Max IOPS: 6000
    • This is used for WebServers, Dev/Test Environments
    • Refer here for official docs
  • Standard HDD:

    • Low cost disk:
    • Used for Backup, non-critical workloads with infrequent access
    • Max Disk Size: 32767 GiB
    • Max throughput: 500 MB/s
    • Max IOPS: 2000
    • Refer Here for official docs
  • Billing:

    • The following factors impact billing of the disk
      • Disk Type
      • Disk Size
      • Snapshots (Backup of a disk)
      • Outbound data transfers
      • Number of Transactions
    • For billing Refer Here
    • Azure Reservations: Disk Reservation is an option to purchase one year of disk storage in advance at a discount.
    • Disk prices may vary from Region to Region
  • Benefits of Azure Managed disks

    • Highly durable & Available: Managed disks are designed for 99.9999% availability, They achieve this by providing with 3 replicas of data.
    • To protect against regional disasters, We can use Azure Backup to create a backup job with time based backups.

Next Steps

  • How are Disks allocated to Azure Vm
  • Shared Disks
  • Ephemeral OS Disks
  • Backup & Recovery for disks

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