AWS Storage Gateway: Cached Volumes or Stored Volumes ?

🚀 The Scenario

The company runs analytics.
They need frequent access to the latest data subsets.
The older data is rarely used.
They want a solution that provides low latency for recent data without storing the entire dataset locally.

…


This content originally appeared on DEV Community and was authored by Wakeup Flower

🚀 The Scenario

  • The company runs analytics.
  • They need frequent access to the latest data subsets.
  • The older data is rarely used.
  • They want a solution that provides low latency for recent data without storing the entire dataset locally.

🗄️ AWS Storage Gateway Options

AWS Storage Gateway offers two Volume Gateway modes:

  1. Stored Volumes
  • Keep the entire dataset on-premises.
  • AWS asynchronously backs it up to Amazon S3 as EBS snapshots.
  • Best when: you need low-latency access to all of your data locally.
  1. Cached Volumes
  • Keep entire dataset in S3.
  • Only frequently accessed data subsets are cached locally.
  • Best when: you want to minimize on-premises storage but still get low-latency access to hot data.

âś… Why Cached Volumes Fit Here

  • The company doesn’t need all old data locally (only the latest subsets).

  • Cached Volumes:

    • Store all data in Amazon S3.
    • Provide local cache for recently accessed data.
    • Applications get low latency for hot data.

  • This saves money & storage space compared to Stored Volumes, which would force them to keep everything on-prem.

đź“Š Key Cached Volume Facts

  • Volume size: 1 GiB → 32 TiB (must be whole GiBs).
  • Per gateway: up to 32 volumes.
  • Max total size per gateway: 1 PiB (1,024 TiB).
  • Access: via iSCSI devices attached to on-premises servers.

❌ Why Stored Volumes Don’t Work

  • Stored Volumes = entire dataset kept locally.
  • That means scaling on-prem storage as the dataset grows.
  • This contradicts the requirement: they only need latest subsets frequently, not the full dataset.

đź“ť Summary

  • Requirement: low latency for latest subsets, not the whole dataset.
  • Best match: Volume Gateway in Cached Mode.
  • Why not Stored Mode? Stored Mode keeps the whole dataset local, which is unnecessary and costly here.


This content originally appeared on DEV Community and was authored by Wakeup Flower


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