• FIG 20.2
  • 327 chapter 19 Cloud Management and a Programming Model Case Study C

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    20.1.2 Amazon Storage Systems
    All Amazon machine instances come with a certain amount of temporal storage for 
    computation. This storage is non-persistent and only exists as long as the machine instance is 
    alive. This storage joins the pool of AWS storage system on termination of machine instance. 
    Therefore, to store data permanently, some persistent storage system has to be used.
    Storage provisioned with AMI instances are non-persistent. It only exists as long as the 
    machine instance is alive.
    To fulfill this need of persistent storage with cloud services, Amazon provides two choices as 
    Amazon EBS volumes or Amazon S3. Users can choose them depending upon their application 
    requirement. Amazon Simple Storage System (Amazon S3)
    The Amazon S3 is scalable and persistent storage system and delivered as a low-cost web 
    service. To store durable data and to install applications, users of AWS can utilize this storage 
    service. Like other services of AWS, S3 also provides a simple web-service interface. It can 
    be used independently from other Amazon cloud services. Even, the applications as hosted 
    in some local (non-cloud) servers under consumer’s own infrastructure can use Amazon S3 
    service to store data.
    In S3, any types of files are stored as objects and those objects are stored into containers 
    called as buckets. The maximum size of an object in S3 can be of 5 terabytes (5 TB). In a single 
    upload though maximum 5 GB of data can be uploaded. For objects larger than this, users will 
    have to use multiple upload capability of AWS. Subscribers have the option of storing their 
    EC2 Instance Purchase Option
    On-demand instance
    Reserved instance
    Spot instance
    FIG 20.2: Options for AWS EC2 instance purchase

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    data as private or public access. Creation of bucket is non-chargeable. Amazon only charges for 
    storing objects into buckets on monthly basis.
    In Amazon S3, files are stored as objects and objects are stored in a location called bucket.
    According to Amazon, S3 gives access to the same highly-scalable, reliable and secure 
    infrastructure that Amazon uses to run with its own global network of web services. Amazon 
    EC2 uses S3 to store Amazon Machine Images. The service has been developed to provide 99.99 
    percent availability and 99.999999999 percent durability of objects. Amazon even presents the 
    agreement offering credits to its consumers if availability of S3 service falls below 99.9 percent. Amazon Elastic Block Store (Amazon EBS)
    Amazon Elastic Block Storage (Amazon EBS) is a persistent storage designed specifically to 
    be used with Amazon EC2 instances. EBS provides raw block devices which is used to create 
    disk volume that can be attached to EC2 instance. EBS volumes are like raw unformatted disk 
    drives that can be formatted using any file system of consumer’s choice (such as ext3 or NTFS).
    EBS cannot function independently like S3. It can be used only with EC2 instances but data 
    is stored persistently independent to the life of instances. A volume can be attached to only one 
    EC2 instance and cannot be shared between instances. But, multiple volumes can be attached 
    to a single EC2 instance. The size of EBS volume ranges from 1 GB to 1 TB. Though EC2 does 
    not impose any limitation on the number of volumes that can be attached to an instance, it 
    depends on the operating system being used for the same. For security of data, there is option 
    of launching the ESB volumes as encrypted volumes where all of the data are automatically 
    stored in encrypted form.
    EBS is extremely reliable and provides high-operational performance with high-speed data 
    access and availability. ESB can be used to install relational databases (like Oracle, Microsoft 
    SQL Server or MySQL), NoSQL databases, enterprise applications (like SAP, Oracle) and so on. Amazon S3 versus Amazon EBS
    Simple Storage Service (S3) and Elastic Block Store (EBS) are two storage services offered by 
    Amazon. But they are not same and are to serve different purposes. EBS is meant to be used 
    with EC2 (Elastic Computing Cloud) instances and is not accessible unless attached to some 
    EC2 instance. On the other hand, S3 is not dependent on EC2. S3 storage can be accessed 
    through any applications using HTTP protocol or with the open-source BitTorrent protocol. 
    Amazon S3 storage cannot be directly accessed. Some software or application is required to 
    access S3 since it communicates through web service interfaces (REST, SOAP and BitTorrent). 
    With EBS, once a volume is mounted on an EC2 instance, it can be accessed just like a disk 
    The storage in ESB is counted on volumes whereas in S3 it is bucket where objects are 
    stored. The two systems differ on many other parameters if performance is measured. But 
    these cannot be treated as advantages or disadvantages as these two systems are made to serve 
    different purposes.

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