Storage Gateway

What is Storage gateway

Service to connect to an on-premises data center with cloud based storage

Three types of storage interfaces are there

1) File Gateway

2) Tape Gateway

3) Volume gateway

File Gateway

1) Enables you to sore and retrive files from S3 using file protocol

2) You cannot use S3 transfer acceleration with file gateway

3) You cannot have two gateway's writing to same storage

4) You can have multiple NFS clients accessing single File Gateway

5) NFS Client can read, delete, rename and truncate

6) You can have only one writer in your S3 bucket

7) You can have multiple readers but only one writer

8) You must poll your objects to make sure they are uploaded completely

9) Limit - 10 File shares per gateway and 1 File share per bucket

Tape Gateway

1) Provides backup with ISCSI. Stored in S3 and can be archived to Glacier.

2) Available Sizes100,200,400, 800 GB , 1.5 & 2.5 TB

3) Can have upto 1500 Virtual tapes. Max size - 1 Pb Capacity

4) Available Sizes100,200,400, 800 GB , 1.5 & 2.5 TB

5) Tape Gateway are accessible only through Tape gateway API's

6) They are uploaded completely use IAM role for bucket , cannot use S3 transfer acceleration

Volume gateway

In Volume gateway we have below three configurations. Types of configurations

a) Gateway cached volume

b) Gateway stored volume

c) Gateway Virtual Tape library

Each volume gateway can support 32 volumes

No limit for number of snapshots

Snapshots only accessible from AWS storage gateway cannot accessed using S3 API

Gateway Cached 

Each volume size is 16TB (Max 512 TB)

Cached data is stored in S3 and only frequently accessed data are saved in local

Gateway stored

Each volume size is 32TB (Max 1PB)

Data is stored locally and backed-up  asyncornously by EBS snapshot and stored in S3. 

Provide access to entire data set on low latency

Monitoring Using Cloudwatch following metrics can be monitored – Cache per directory used, cache free, cloud bytes uploaded & downloaded