Storage

To save costs, you shut down some of your EC2 servers over the weekend that were used to deploy your application. One Monday when you try the application, you realize that you are not able to start the application since all the data that was stored in the application is gone. What could be the reason for this?

You are running a SQL Server database that is very I/O intense on EC2 instances. Your application needs a minimum of 4200 IOPS, or it won’t perform optimally. How do you make sure that your application always performs optimally?

You need to retain all the data for seven years for compliance purposes. You have more than 300TB of data. You are storing everything in the tape drive for compliance, and over the years you have found out it is costing you a lot of money to maintain the tape infrastructure. Moreover, the restore from the tape takes more than 24 hours. You want to reduce it to 12 hours. You have heard that if you move your tape infrastructure to the cloud, it will be much cheaper, and you can meet the SLA you are looking for. What service would you choose?

You have a homegrown application that you want to deploy in the cloud. The application runs on multiple EC2 instances. During the batch job process, the EC2 servers create an output file that is often used as an input file by a different EC2 server. This output file needs to be stored in a shared file system so that all the EC2 servers can access it at the same time. How do you achieve this so that your performance is not impacted?

You have created an S3 bucket for your application and immediately receive more than 10,000 PUT requests per second. What should you do to ensure optimal performance?

You are running a highly available application in AWS. The business needs a very performant shared file system that can be shared across EC2 servers (web servers). Which AWS service can solve this problem?

You are running your EC2 instance on the us-west-1 AZ. You are using an EBS volume along with the EC2 server to store the data. You need to move this instance to us-west-2. What is the best way to move all the data?

You are running some tests for your homegrown application. Once the testing is done, you will have a better idea of the type of server needed to host the application. Each test case runs typically for 45 minutes and can be restarted if the server goes down. What is the cost-optimized way of running these tests?

You are hosting your application on your own data center. The application is hosted in a server that is connected to a SAN, which provides the block storage. You want to back up this data to AWS, and at the same time you also would like to retain your frequently accessed data locally. Which option should you choose that can help you to back up the data in the most resilient way?

You are developing a document management application, and the business has two key requirements. The application should be able to maintain multiple versions of the document, and one year the documents should be seamlessly archived. Which AWS service can serve this purpose?

You are doing an audit for a company, and while doing the audit, you find that the company has kept lots of log files in a public bucket in Amazon S3. You try to delete them, but you are unable to do it. What could be the reason for this?

You are running a workload involving large sequential I/O. You are planning to use an EBS volume for the workload. The data is infrequently accessed. You are also looking at optimizing the cost. Which EBS volume should you choose?

You are running your critical application on EC2 servers and using EBS volumes to store the data. The data is important to you, and you need to make sure you can recover the data if something happens to the EBS volume. What should you do to make sure you are able to recover the data all the time?

You have an application for which you are thinking of using EC2 to host the Oracle database. The size of the database is 100GB. Since the application needs operating system access in the database tier, you can’t use RDS. The application will be used infrequently, though sometimes it will be used in the morning and during the evening. What is the most cost-effective way to design the storage layer?

You are designing a media-streaming application, and you need to store hundreds of thousands of videos. Each video will have multiple files associated with it for storing the different resolutions (480p, 720p, 1080p, 4K, and so on). The videos need to be stored in durable storage.