Skip to main content

Windows Azure storage concepts

You can create a storage accounts in windows Azure and provide your applications access to the tables, Blobs and queues in it.

  • The maximum capacity of data for storage accounts is 200TB, if it was created after June 8th 2012 and 100 TB if created before that.
  • Geo redundant Storage(GRS): Replicates the storage to a secondary, geographically separate location. Data is replicated asynchronously to the secondary location in the background. If there is any failure in primary location, storage will failover to the secondary location
  • Locally redundant Storage(LRS) : For any storage, the data is replicated three times within the same datacentre. All Windows Azure storages are locally redundant
  • Affinity group: It is a geographical grouping of cloud deployments and storage accounts.By grouping the services used by your application in a affinity group in  a particular geographical location, you can improve your service performance
  • Storage account endpoints: Highest namespace for accessing the tables, queues and blobs in a storage. Default endpoints will have the following values
Blob service: http://mystorageaccount.blob.core.windows.net
Table service: http://mystorageaccount.table.core.windows.net
Queue service: http://mystorageaccount.queue.core.windows.net


  • Storage account URLS: URls for accessing an object in a storage account For eg: http://mystorageaccount.blob.core.windows.net/mycontainer/myblob.
  • Storage access key: This is the 512 bit access key generated by Windows Azure when you create a storage account. there will be two keys, primary and secondary. You can choose to regenerate the keys at a later point if required

Blobs:   Blobs are mainly used to store large amount of  unstructured data . All blobs must be created inside a container, there can be unlimited number of these in an account. There can be two types of blobs- Page blobs(maximum size of 1TB) and block blobs(maximum size of 200GB)

Tables: Tables are used to store structured but non-relational data. It is a NoSQL datastore that can service authenticated calls from inside and outside of Windows Azure cloud.Table is a collection of entities, but it doesnt force a schema on the entities.This means that the a single table can have entities with different set of properties. Entity is a set of property, similar to a DB row. It can be upto 1 MB in size. Whereas Property is a name-value pair. An entity can have upto 252 properties for storing data. Each Entity will have three system defined properties ie apartition key,row key and a timestamp

Queues:  It is a service for storing messages, that can be accessed using authenticated http or https calls. A single queue message can be upto 64 KB in size. It can have millions of messages , limited only by the maximum storage capacity. It is mostly useful in scenarios where there is a backlog of messages to be processes asynchronously or to pass messages from the Windows Azure web role to a worker role.

Comments

Popular posts from this blog

Windows server 2012: where is my start button??

If you have been using Windows Server OS for a while, the one thing that will strike you most when you login to a Windows server 2012 is that there is no start button!!.. What??..How am I going to manage it?? Microsoft feels that you really dont need a start button, since you can do almost everything from your server  manager or even remotely from your desktop. After all the initial configurations are done, you could also do away with the GUI and go back to server core option.(In server 2012, there is an option to add and remove GUI). So does that mean, you need to learn to live without a start button. Actually no, the start button is very much there .Lets start looking for it. Option 1: There is "charms" bar on the side of your deskop, where you will find a "start" option. You can use the "Windows +C" shortcut to pop out the charms bar Option 2: There is a hidden "start area"in  the bottom left corner of your desktop

Use Diskpart to make drives online

Issue: In disk management, disk is shown as missing or Offline in Windows Resolution: The disks can be made online by using diskpart utility - Open a command prompt->type diskpart -Inorder to list the disks in the system type: list disk -Note down the number of the disk that you want to make online -Select that disk to operate upon, For eg:, if the disk number is 1, type: Select disk 1 -Now that particular disk will be selected as teh active disk. If you type "list disk" command once more, you can see a * symbol on the left side of the selected disk -Inorder to make the selected disk online type : online disk - If the disk is made online, you will get a message that the operation is completed successfully

Kubernetes best practices in Azure: AKS name space isolation and AAD integration

Once you have decided to run your workloads in AKS service in Azure, there are certain best practices to be followed during design and implementation. In this blog we will discuss two of these recommended practices and the practical aspects of their implementation- Azure AD integration and name space isolation While AAD helps to authenticate users to your AKS cluster using the existing users and groups in your Azure AD, name space isolation provides logical isolation of resources used by them. It is useful in multi tenant scenarios where the same cluster is being used by different teams/departments to run their workloads. It is also useful in running say a dev, test and QA environment for organization in the same cluster. Combining AAD integration with name spaces allow users to login to their namespace using their Azure AD credentials AAD integration with AKS : The following Microsoft document will get you started  with AAD integration of AKS cluster.: https://docs.microsof