What are the differences between cached volume and stored volume volume gateways?

In my other post, I discussed the differences between AWS file gateway and volume gateway. In this post, I will discuss the differences between the two gateway modes that volume gateway offers; cached and stored. Both modes provides iSCSI interface access to Amazon S3 storage using AWS Storage Gateway. However, the following are some differences between them to be aware of :

Cached Volume Gateway Stored Volume Gateway
Cached volume gateway provides low latency access to the data that is stored in its local cache disk. Cached Gateway storage volumes uses Amazon S3 as back-end storage. Stored volume gateway provides low latency access to all of your dataset. You use your local on-premises SAN/DAS storage and assign it to the stored gateway VM. Then, use that storage to create storage volumes.
You can deploy on Amazon EC2 host platform in addition to other on-premises hypervisor platforms.You cannot deploy on Amazon EC2 host platform. You can only deploy on on-premises hypervisor platforms.
You need at least two local disks, one for cache storage and one for upload buffer.You need local disks for the upload buffer and your storage volumes. You don’t assign cache storage.
No default snapshot schedule for volumes, but you can configure scheduled snapshot using AWS Backup or AWS Storage Gateway.Default snapshot schedule of one in every 24 hours. You cannot disable this, as data is stored on local disks and backups are taken to Amazon S3.
Volumes can go to pass through/bootstrapping status when there are issues with upload buffer space utilization.Volumes can go to pass through/bootstrapping/restoring pass through statuses. Pass through and bootstrapping can happen when you create/expand a storage volume preserving the existing data.
Maximum size of a volume is 32 TiB.Maximum size of a volume is 16 TiB.
Total size of all volumes for a gateway is 1,024 TiB.Total size of all volumes for a gateway is 512 TiB.


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