March 6, 2011 2 Comments
One of the first things I had o do as part of my deployment activities for both AWS and for Windows Azure was to write some tools written in C# to allow me to upload , and download files from their respective storage solutions : S3 for AWs and blob storage for Windows Azure. Both solutions are similar in the way you interact with them and the similarities do not stop there. The table below makes some comparisons between the two Storage systems essentially ending up showing how similar they are to work with.
|AWS S3||Windows Azure Blob Storage|
|An S3 account is associated with an AWS account but the account name is NOT associated with the namespace of the objects stored on S3||A storage account is a globally uniquely identified entity within blob storage. The account is the parent namespace for the Blob service|
|Objects are placed in containers called buckets
|Objects are placed in containers called containers|
|An object is a file and optionally any metadata that describes that file||An object is represented by a blob. A blob is made up of resources that includes content, properties, and metadata|
|Interaction with buckets and objects are via the soap and rest API||Interaction with containers and blobs are via the rest API|
|The bucket name you choose must be unique across all existing bucket names in Amazon S3.
Bucket names must comply with the following requirements:
To conform with DNS requirements, AWS recommend following these additional guidelines when creating buckets:
|The container name must be a valid DNS name, conforming to the following naming rules:
|An object has data, a key, and metadata. When you create an object you specify the key name. This key name uniquely identifies the object in the bucket. The name for a key is a sequence of Unicode characters whose UTF-8 encoding is at most 1024 bytes long||A blob name can contain any combination of characters, but reserved URL characters must be properly escaped. A blob name must be at least one character long and cannot be more than 1,024 characters long.|
|You cannot nest buckets||You cannot nest containers|
|objects are stored in buckets but you can create folders within the buckets by using the ‘/’ delimiter as part of the object name||The Blob service is based on a flat storage scheme, not a hierarchical scheme. However, you may specify a delimiter such as ‘/’ within a blob name to create a virtual hierarchy|
|S3 buckets can be created in specific regions||Storage accounts can be created in specific regions|
|Access to objects and buckets is managed via access control lists (ACLs) and bucket policies. You can use them independently or together.||Access to blobs and containers is controlled via ACL’s which allow you to grant public access and Shared Access signatures which provide more granular access|
|To load large objects use Multipart upload which allows you to upload a single object as a set of parts. Multipart upload allows the upload of parts in parallel to improve throughput. Smaller part sizes minimize the impact of restarting a failed upload due to a network error.||To upload large blobs use block blobs. Block blobs allows the upload of blobs larger than 64MB. It allows the upload of blocks in parallel. It allows the resumption of failed uploads by retrying only the blocks that weren’t already uploaded.
|The location of your object in Amazon S3 is a URL, generally, of the form:
||For a blob, the base URI includes the name of the account, the name of the container, and the name of the blob:
|To access programmatically Use the AWS SDK||To access programmatically use the Azure SDK|
|To use .NET before interacting with S3 is to provide your AWS credentials e.g :
public static string accessKeyID;
public static string secretAccessKeyID;
NameValueCollection appConfig = ConfigurationManager.AppSettings;
accessKeyID = appConfig["AWSAccessKey"];
secretAccessKeyID = appConfig["AWSSecretKey"];
Targetbucket = appConfig["TargetBucket"];
// set up connection to AWS S3
using (s3client = Amazon.AWSClientFactory.CreateAmazonS3Client(accessKeyID, secretAccessKeyID))
|To use .NET the before interacting with Blob storage is to provide your Azure Storage credentials e.g:
String AccountName_var = (String)ConfigurationSettings.AppSettings["AccountName"];
String AccountSharedKey_var = (String)ConfigurationSettings.AppSettings["AccountSharedKey"];
String ContainerName_var =(String)ConfigurationSettings.AppSettings["ContainerName"];
// Setup the connection to Windows Azure Storage
StorageCredentialsAccountAndKey storageCredentialsAccountAndKey = new StorageCredentialsAccountAndKey(AccountName_var, AccountSharedKey_var);
_BlobClient = new CloudBlobClient(AccessUri, storageCredentialsAccountAndKey);
|To use a custom domain requires the use of CNAMES||To use a custom domain requires the use of CNAMES|
|Reduced redundancy option available to reduce costs||No equivalent|
Update to add some sizing info:
S3 has a maximum size limit of 5 TB whereas Azure blob storage has a maximum size limit for a single file of 1 TB ( Azure Blob storage: Page blob max size :1 TB block blob max size : 400 GB) .
There is strict limit of 100 TB per storage account for Windows Azure. The following post http://blogs.msdn.com/b/windowsazurestorage/archive/2010/05/10/windows-azure-storage-abstractions-and-their-scalability-targets.aspx describes the scalability targets for Windows Azure Storage.
S3 does not appear to have a limit on the total size of objects guess that’s down to how much money you wish to spend but there is a limit of 100 buckets per AWS account.