‫Okay, so let's discuss
‫different storage classes we have for Amazon S three.
‫The first one is Amazon S three Standard-General Purpose.
‫Then we have Amazon S three-Infrequent Access.
‫Then we have Amazon S three One Zone-Infrequent Access.
‫Then we have Glacier Instant Retrieval,
‫Glacier Flexible Retrieval, Glacier Deep Archive,
‫and then finally, the Amazon S three Intelligent Tiering.
‫So we'll learn about all these classes in depth
‫in this lecture, but you have to know them for the exam.
‫Then when you create an object in Amazon S three,
‫you can choose its class,
‫you can also modify its storage class manually,
‫or as we'll see as well,
‫you can use Amazon S3 Lifecycle configurations
‫to move objects automatically
‫between all these storage classes.
‫So first, before we go into the classes,
‫let's define the concept of durability and availability.
‫So durability represents how many times an object
‫is going to be lost by Amazon S three.
‫And so Amazon S three has a very high durability.
‫It's called 11 nines.
‫So nine nine point and then nine times nine percent.
‫And that means that on average,
‫if you store 10 million objects on Amazon S three,
‫you can expect to lose a single object
‫once every 10,000 years.
‫So it's quite durable.
‫And the durability is the same
‫for all storage classes in Amazon S three.
‫Availability represents how readily a service is.
‫And so this depends on the storage class.
‫For example, S three Standard has a 99.99% availability.
‫That means that about 53 minutes a year,
‫the service is not going to be available.
‫That means that you'll get some errors
‫when you deal with the service.
‫So you need to take that into account
‫when you develop your applications.
‫Okay.
‫So S3 standard has 99.99 availability.
‫It's going to be used for frequently accessed data.
‫This is the kind of storage you use by default,
‫and it has low latency and high throughputs.
‫It can sustain two concurrent facility failures
‫on the side of AWS and the use cases for it
‫is going to be big data analytics,
‫mobile and gaming application,
‫as well as content distribution.
‫Next, we have S three infrequent access.
‫So this is data that is going to be as the name indicates,
‫less frequently accessed,
‫but requires rapid access when needed.
‫It's going to be lower cost than S three Standard,
‫but you will have a cost on retrieval.
‫So the S three Standard-IA is 99.9% availability,
‫so a bit less available.
‫And the use case for it is going to be Disaster Recovery
‫and backups.
‫And Amazon S three One Zone-Infrequent access, One Zone-IA.
‫ESC has high durability, okay, within a single AZ only,
‫and the data is going to be lost
‫if the AZ is somewhat destroyed.
‫As well as durability, it's even lower.
‫So it's 99.5% availability.
‫And so the use cases of S three One Zone-IA
‫is to store secondary copy of backups
‫of maybe on-premises data, or data you can recreate.
‫Next we have the Glacier Storage Classes.
‫So Glacier is, as the name it gets very cold,
‫so it's low cost object storage
‫meant for archiving and backup.
‫And the pricing is that you're going to pay for the storage
‫plus pay for a retrieval cost.
‫In your three classes of storage within Glacier,
‫you have the Amazon S three Glacier Instant Retrieval.
‫And this gives you milliseconds retrieval
‫which is great for example,
‫for data that's accessed once a quarter,
‫and the minimum store duration is 90 days.
‫So this is backup,
‫but you need to access it within milliseconds.
‫Then we have the Glacier Flexible Retrieval.
‫It used to be called Amazon S three Glacier
‫but then they renamed things as they added more tier.
‫So the Amazon Glacier Flexible Retrieval
‫has three flexibility.
‫So you have expedited where you get the data back
‫between one and five minutes.
‫You have standard to get the data back
‫between three to five hours, or bulk, which is free,
‫where you get data back between five to 12 hours.
‫And the minimum storage duration as well is 90 days.
‫So here, instance means you retrieve data instantly
‫and flexible means that you're willing
‫to wait up to for example, 12 hours to retrieve your data.
‫And then we have Glacier Deep Archive
‫which is meant for long term storage.
‫So we have two tiers of retrieval as well.
‫We have Standard of 12 hours and Bulk of 48 hours.
‫So you may be ready to wait a lot of time
‫to retrieve data,
‫but it's going to give you the lowest cost,
‫and as well, the minimum storage duration is 180 days.
‫So as you know, that's a lot of storage classes
‫and there's one last called S three Intelligent- Tiering,
‫which is going to allow you to move objects
‫between excess tiers based on usage patterns.
‫And for this, you're going to incur a small
‫monthly monitoring fee, and auto tiering fee.
‫And there are no retrieval charges
‫in S three Intelligent- Tiering.
‫So there is the frequent access tier that's automatic
‫the default tier.
‫Then we have the Infrequent Access tier
‫for objects not accessed for example, for 30 days.
‫Then you have the Archive Instant Access tier,
‫automatic as well for objects not accessed over 90 days.
‫And then the Archive Access tier that's optional.
‫And you can configure it from 90 days to 700 plus days.
‫And then you have the Deep Archive Access tier
‫also optional, that you can configure for objects
‫that haven't been accessed between 180 days
‫to 700 plus days.
‫Okay.
‫So S three Intelligent-Tiering is really
‫to allow you to just sit back and relax
‫while S three moves objects for you.
‫So if you compare all the storage classes
‫you don't need to remember these numbers,
‫but it's just for you to make sense of what they are.
‫So you get durability of 11 nine's everywhere.
‫Then as availability goes down, the less zones you have,
‫of course.
‫It just shows you like for example
‫the minimum storage duration chart and so on.
‫So take some time to look at this diagram on your own.
‫You should understand it,
‫but you should not remember it for sure.
‫So if we look at some pricing, for example
‫in the us-east-one,
‫so this is the kind of pricing you would have
‫for all the storage classes.
‫And again, you're not supposed to remember everything.
‫But it's good for you to have a look at it
‫on your own time, just to make sure you understand.
‫Because if you understand what the classes name are,
‫then you should be able to make sense of these classes.
‫Okay?
‫So that's it for the lecture.
‫I hope you liked it.
‫And I will see you in the next lecture.