Set Blob Tier
Set Blob Tier operation sets the access tier on a blob. The operation is allowed on a page blob in a premium storage account and on a block blob in a blob storage or general purpose v2 account. A premium page blob's tier (P1, P2, P3, P4, and so on) determines the allowed size, input/output operations per second (IOPS), and bandwidth of the blob. A block blob's tier determines the
Archive storage type. This operation doesn't update the blob's ETag.
Cold tier is currently in preview.
For detailed information about block blob-level tiering, see Hot, cool, and archive storage tiers.
You can construct the
Set Blob Tier request as follows. We recommend that you use HTTPS. Replace myaccount with the name of your storage account, and replace myblob with the blob name for which the tier is to be changed.
|Method||Request URI||HTTP version|
You can specify the following additional parameters on the request URI:
||Optional. The snapshot parameter is an opaque
||Optional for version 2019-12-12 and later. The
The required and optional request headers are described in the following table:
||Required. Specifies the authorization scheme, storage account name, and signature. For more information, see Authorize requests to Azure Storage.|
||Required. Specifies the Coordinated Universal Time (UTC) for the request. For more information, see Authorize requests to Azure Storage.|
||Required. Indicates the tier to be set on the blob. For a list of allowed premium page blob tiers, see High-performance premium storage and managed disks for virtual machines (VMs). For a blob storage or general purpose v2 account, valid values are
||Required for all authorized requests. Specifies the version of the operation to use for this request. For more information, see Versioning for the Azure Storage services.|
||Optional. Provides a client-generated, opaque value with a 1-kibibyte (KiB) character limit that's recorded in the logs when logging is enabled. We highly recommend that you use this header to correlate client-side activities with requests that the server receives. For more information, see About Storage Analytics logging.|
||Optional. Indicates the priority with which to rehydrate an archived blob. Supported on version 2019-02-02 and later for block blobs. Valid values are
As of version 2020-06-12, you can update the rehydration priority after it has been set. You can change the priority setting from
This operation also supports the use of conditional headers to tier the blob only if a specified condition is met. For more information, see Specify conditional headers for Blob Storage operations.
The response includes an HTTP status code and a set of response headers.
A successful operation returns status code 200 (OK) if the new tier takes effect immediately, or status code 202 (Accepted) if the transition to the new tier is pending.
For premium storage accounts, the page blob operation returns status code 200 (OK).
For block blobs, the HTTP status codes that are returned, based on the current and requested tiers of the blob, are described in the following table:
|Tier||Set to hot tier||Set to cool tier||Set to cold tier||Set to archive tier|
|Blob in hot tier||200||200||200||200|
|Blob in cool tier||200||200||200||200|
|Blob in cold tier||200||200||200||200|
|Blob in archive tier||202||202||202||200|
|Blob in archive tier, rehydrating to hot||202||409||409||409|
|Blob in archive tier, rehydrating to cool||409||202||409||409|
|Blob in archive tier, rehydrating to cold||409||409||202||409|
For more information about status codes, see Status and error codes.
The response for this operation includes the following headers. The response may also include additional standard HTTP headers. All standard headers conform to the HTTP/1.1 protocol specification.
||Uniquely identifies the request that was made and can be used to troubleshoot the request. For more information, see Troubleshoot API operations.|
||The Blob Storage version that was used to execute the request. This header is returned for requests made against version 2009-09-19 and later.|
||Can be used to troubleshoot requests and corresponding responses. The value of this header is equal to the value of the
This operation can be called only by the storage account owner and by anyone with a shared access signature with permissions to write to this blob or its container.
Setting a blob's tier for page blobs in premium accounts has the following restrictions:
- The new blob tier can't be lower than the existing one.
- The new blob tier should be able to accommodate the blob's content length. For a list of tiers and their allowed content length, see High-performance premium storage and managed disks for VMs.
Setting the block blob's tier on a Blob Storage or general purpose v2 account has the following restrictions:
- Setting a tier on a snapshot is allowed as of REST version 2019-12-12.
- Snapshots that are tiered to
archivecan't be rehydrated back into the snapshot. That is, the snapshot can't be brought back to a
cooltier. The only way to retrieve the data from an
archivesnapshot or version is to copy it to a new blob.
- If the version is a root blob, it can be rehydrated back to
- Snapshots or versions in an
archivestate aren't allowed to be promoted to root.
- When versioning is enabled, the deletion of a root blob when it's in a rehydrate-pending state will result in the cancellation of the rehydration, and the version will be in an
- If a blob is overwritten when it's in a rehydrate-pending and soft-deleted state, it will result in the cancellation of the rehydration, and the version of the soft-deleted snapshot will be in an
The list of supported tiers isn't restricted by the request version, and new tiers can be added in the future.
For detailed information about block blob level tiering see Hot, cool, and archive storage tiers.