DP-900 · Question #272
Blob rehydration occurs in Azure Blob storage when a blob moves between which access tiers?
The correct answer is D. Archive to Cool. Blob rehydration is the process of moving a blob from the offline Archive tier to an online tier (Hot or Cool) so it becomes accessible. Archive-tier blobs cannot be read directly and must be rehydrated first.
Question
Options
- AHot to Cool
- BHot to Archive
- CCool to Archive
- DArchive to Cool
How the community answered
(30 responses)- A3% (1)
- C7% (2)
- D90% (27)
Why each option
Blob rehydration is the process of moving a blob from the offline Archive tier to an online tier (Hot or Cool) so it becomes accessible. Archive-tier blobs cannot be read directly and must be rehydrated first.
Moving from Hot to Cool is a simple online tier change with no rehydration needed, as both are online accessible tiers.
Moving from Hot to Archive transitions a blob into offline storage and is called archiving, not rehydration.
Moving from Cool to Archive also transitions a blob to offline storage; this is archiving, not rehydration.
Blobs in the Archive tier are stored offline and cannot be read or modified until they are rehydrated to an online tier such as Cool or Hot. Moving from Archive to Cool triggers the rehydration process, which can take hours depending on the rehydration priority selected. This is the defining scenario for blob rehydration in Azure Blob Storage.
Concept tested: Azure Blob Storage Archive tier rehydration
Source: https://learn.microsoft.com/en-us/azure/storage/blobs/archive-rehydrate-overview
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