@Manchukonda Kranthi Kumar Firstly, Apologies for the delay response!
You are correct that Azure Blob storage offers lifecycle management policies and access tiers, but there is a distinction between them and their applicability to different types of storage accounts.
Note: Data stored in a premium block blob storage account cannot be tiered to hot, cool, cold or archive by using Set Blob Tier or using Azure Blob Storage lifecycle management. To move data, you must synchronously copy blobs from the block blob storage account to the hot tier in a different account using the Put Block From URL API or a version of AzCopy that supports this API. The Put Block From URL API synchronously copies data on the server, meaning the call completes only once all the data is moved from the original server location to the destination location.
Regarding your question, while access tiers are not supported in block blob storage accounts, lifecycle management policies can still move blobs between hot, cool, and archive tiers in these accounts. This is because lifecycle management policies are implemented at the storage account level, not at the blob level. The policy is applied to the entire storage account, and it can move blobs between tiers based on the specified conditions.
The reason why access tiers are not defined in block blob storage accounts is because block blob storage accounts are optimized for high-performance scenarios, such as big data analytics and high-performance computing. These scenarios typically require fast access to data, so access tiers are not necessary. Instead, block blob storage accounts provide other features, such as premium performance and low latency.
Lifecycle Management Policies: Lifecycle management policies allow you to define rules that automatically move or delete blobs based on their age or other criteria. This feature is available for Blob storage (standard) accounts, GPv2 (general-purpose v2) accounts, and block blob storage accounts (premium). With lifecycle management policies, you can transition blobs between the hot, cool, and archive tiers within these supported storage accounts.
Access Tiers: Access tiers, on the other hand, determine the availability and cost of storing blobs in Azure Blob storage. However, access tiers are only applicable to Blob storage (standard) accounts and GPv2 (general-purpose v2) accounts. Access tiers allow you to choose between hot and cool tiers, where hot tier offers higher availability and slightly higher storage costs, while cool tier offers lower storage costs but with slightly higher data retrieval costs.
Regarding block blob storage accounts, it is important to note that they are designed specifically for high-performance scenarios with premium storage capabilities. Block blob storage accounts do not support access tiers because they do not have the same cost and availability characteristics as Blob storage (standard) or GPv2 accounts. Block blob storage accounts are optimized for transactional workloads, whereas access tiers are more relevant for general-purpose object storage scenarios.
While access tiers are not available in block blob storage accounts, you can still use lifecycle management policies to manage the lifecycle of blobs within these accounts. Lifecycle management policies can be configured to transition blobs within the same block blob storage account based on age, allowing you to move them between different tiers (hot, cool, archive) if desired.
In summary, lifecycle management policies provide the capability to manage blob lifecycles, including transitions between different storage tiers, within Blob storage (standard), GPv2, and block blob storage accounts. However, access tiers are only applicable to Blob storage (standard) and GPv2 accounts, as they offer different cost and availability options that may not align with the characteristics of block blob storage accounts.
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