Azure Storage support three different level of storage tiers for Blob objects. They are Hot storage tier, Cool storage tier, and Archive storage tier. This enables cost-effective usages of blob data storages. With the different level of storage tiers, you can choose what types of tier needs for your data. To quickly summarize, we use hot storage tier for these data which are accessed very frequently.
Cool tier intended to access less than hot tiers, in general for at least 30 days. Archive tier is intended for long-term data backup or archival purpose and will remain in the tier for at least 180 days. Hot tier has the highest storage cost and lowest access cost, whereas the archive tier has the lowest storage cost and highest access cost. You may read more about these access tier from here
Account Level Access Tier in Azure Storage
When we create Azure Storage Account, we chose the Storage Tier (Available only for gpV2 and blob account type). During the storage account creation, we can choose the tier between Hot or Cool.
This access tier is the storage account level, which you can go and check from the storage configuration option.
Update Access Tier in Azure Storage Blob Level – From Azure Portal
You can easily change the access tier at blob level for storage accounts. If you want to perform this action from Azure Portal, open the respective Azure Blob. Then select the “Blob Properties”
From the properties window, you can change access tier for the blob to Hot, Cool or Archive.
Update Access Tier in Azure Storage Blob Level – From Storage Explore
You can change the access tier from Azure Storage Explorer as well. Open the respective blob in the explorer and from the context menu select “Change Access Tier”
This will bring, “Update Access Tier” window from where you can select the access tier to update.
Other than these, you can use Azure CLI ( az storage blob) to perform these activities from CLI, also you can update it through code.