A legacy application needs to interact with local storage using iSCSI. A team needs to
design a reliable storage solution to provision all new storage on AWS. Which storage
solution meets the legacy application requirements?
https://docs.aws.amazon.com/storagegateway/latest/userguide/StorageGatewayConcepts.html
Cached volumes -- You store your data in Amazon Simple Storage Service (Amazon S3) and retain a copy of frequently accessed data subsets locally. Cached volumes offer a substantial cost savings on primary storage and minimize the need to scale your storage on-premises. You also retain low-latency access to your frequently accessed data. Stored volumes -- If you need low-latency access to your entire dataset, first configure your on-premises gateway to store all your data locally. Then asynchronously back up point-in-time snapshots of this data to Amazon S3. This configuration provides durable and inexpensive offsite backups that you can recover to your local data center or Amazon EC2. For example, if you need replacement capacity for disaster recovery, you can recover the backups to Amazon EC2 https://docs.aws.amazon.com/storagegateway/latest/userguide/WhatIsStorageGateway.html
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