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Hey, Cloud Gurus.

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Welcome to this lesson on archiving data,

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and specifically accomplishing that with Azure Blob storage.

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In the next few minutes, we're going to talk a little bit

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about access tiers.

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We're going to look at the tier breakdown,

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some considerations when choosing tiers,

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and wrap it up with a review.

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So let's get started.

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There are 3 access tiers available to you

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in Azure Blob storage.

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The first is Hot,

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and this is optimized for frequently accessed data.

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This is what your storage account will be set to by default

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because it assumes that you're working with day-to-day data.

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From there we have Cool,

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which is optimized for infrequently accessed data

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that's stored for at least a month.

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And finally, Archive,

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which is optimized for data that is rarely accessed.

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If we break these down a little bit starting with Hot,

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we have no minimum time there

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because like I said, this is your day-to-day data.

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This is where you're operating on a continual basis.

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Storage costs here are the highest,

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but it's access costs are the lowest of the three,

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and it's used for active or staging data.

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Stepping down from there, we have Cool,

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and that has a minimum time of 30 days.

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There is an early deletion penalty

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if you take it out before that 30 days,

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but we'll get more to that in a moment.

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It's storage cost is lower compared to the Hot

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and it's access cost is higher compared to Hot storage.

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And so it falls in the middle between Hot and Archive.

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It's going to be about half the storage cost

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compared to the Hot tier,

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and about twice the read/write access cost compared to Hot.

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And so its wheelhouse is really short-term data,

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making it great for short-term backup and recovery.

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Finally, we have Archive,

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which has a minimum time of 180 days.

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It's storage cost is extremely cheap compared to the others,

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but it's access cost is the highest.

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It becomes very expensive to move or delete data

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in this tier,

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because it's meant to be left there for a long time,

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making it great for long-term backup

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or compliance and regulatory purposes.

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There are some considerations for working with these tiers.

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One, you can set Hot and Cool access tiers

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at the account level,

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but Archive has to be set at the blob level.

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Two, there is some lower availability

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associated with the Cool access tier compared to Hot.

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And that's the trade-off you get

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for having a lower storage cost.

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As mentioned before, there is an early deletion penalty

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if you have blobs in the Cool or Archive access tiers

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and move or delete them before the minimum time.

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You will incur an early deletion fee.

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Archive data is stored offline,

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and so it is not as simple to move data within that tier

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back and forth between the other tiers.

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In order to retrieve it, it has to be rehydrated.

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And you can think about this

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kind of like your blobs being zipped and stored offline.

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It's going to take a long amount of time

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to bring it back online on a different tier.

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Your redundancy options are a little bit different

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with the Archive tier only supporting LRS, GRS, and RA-GRS,

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but Hot and Cool have access to all of the options.

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And you need to keep in mind, storage limits.

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Data storage limits are set at the account level,

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not per access tier.

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So you can put everything in one access tier if you want,

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or spread them across all three.

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It's all using the same limit of your storage account.

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From here, let's jump over to the Azure portal

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and take a look at setting these access tiers.

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Here we are in the Azure portal,

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and I'm simply using the Cloud Playground

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included with A Cloud Guru subscriptions.

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We have a number of containers here,

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one for a landing zone,

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a curated zone, and a production zone.

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If we open up this landing zone folder,

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there is a testdata.json blob here,

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and you can see that the access tier is Hot,

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and that is inferred from the account level,

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which we'll take a look at in a moment.

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But if we wanted to change that level for this blob,

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we can click our 3 dots over here

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and come to Change Tier.

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From there, we can change it from Hot to Cool or Archive.

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And remember, you can only change it to Archive

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at this level.

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You can't do that at the account level.

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So let's change it to Cool and click Save.

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And it's just that easy.

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You can change those back and forth as you want,

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but keep in mind the early deletion penalties

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if you move it out of the Cool or Archive tiers

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before those minimum time limits.

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Let's pop back out to our list of containers.

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And if we come down in this left column to Configuration,

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and this is the configuration of our storage account.

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We click on that.

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Here you can see our default blob access tier.

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And now you can understand

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why it said that Hot was inferred.

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That is the default level that is set on our account.

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And so you can choose either Cool or Hot,

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and as mentioned, you cannot choose Archive from here.

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And by way of review,

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Hot access tier is for frequently used data.

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Cool access tier is for infrequently used data

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that will be stored at least 30 days.

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And Archive access tier is for long-term storage

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of 180 days or more.

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Thank you for joining me for this lesson

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around archiving data in Azure Blob storage.

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when you're ready I'll see you in the next video.