AWS - Storage Gateway

Storage Gateway

  1. It connects on-premise with cloud based storage.
  2. Storage gateway's software appliance is available for download as VM image.
  3. Once installed on on-premise datacenter and associated with AWS by activation process.
  4. AWS management console is used now(after 3) to configure storage options.
  5. iSCSI is an acronym for Internet Small Computer Systems Interface, an Internet Protocol-based storage networking standard for linking data storage facilities.
Connection flow -
Customer on-premise host - AWS Gateway -->Data connect or AWS VPC --> S3

    • Direct connect is direct line between customer's on premise data centre.
    • Through VPC directly connecting to EC2 instance.

Four types of storage gateways

  1. File gateway (NFS-S3)
  2. Volume gateway (iSCSI-block based storage)
    1. Stored volume
    2. Cached volume
    3. Tape gateway (VTL-Virtual tapes for backup)
File gateway - Files are stored as objects in your S3 buckets, accessed through a NFS mount point. All metadata is stored durably on S3. Once object is transferred to S3 it is managed as native S3 object.

Volume gateway - These are volume interface with disk volumes using the iSCSI block protocol.
data stored are backed up asynchronously, point -in-time snapshots of your volumes. Snapshots are incremental backups.

    • Stored volume : To store primary data locally, While asynchronously backing up data to AWS S3 in the form of EBS snapshots. We can create storage volume (created on AWS) and mount them as iSCSI to application servers. Data stored locally on on-premise hardware. 1GB to 16TB stored volumes. Data that is to be uploaded to AWS storage volumes are stored on gateway VM in upload buffer.
    • Cached volume : It allows us to use S3 as primary storage. Frequently accessed data is cached on gateway VM in cached volume. 1GB - 32TB in size. Read data downloaded to cached volume and write data is stored in upload buffer.
    • Tape gateway : To archive data on AWS cloud through VTL interface, tape gateway available as iSCSI devices

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