# Ebs

This page documents function available when using the Ebs module, created with @service Ebs.

### Documentation

Main.Ebs.complete_snapshotMethod
complete_snapshot(snapshot_id, x-amz-_changed_blocks_count)
complete_snapshot(snapshot_id, x-amz-_changed_blocks_count, params::Dict{String,<:Any})

Seals and completes the snapshot after all of the required blocks of data have been written to it. Completing the snapshot changes the status to completed. You cannot write new blocks to a snapshot after it has been completed.

Arguments

• snapshot_id: The ID of the snapshot.
• x-amz-_changed_blocks_count: The number of blocks that were written to the snapshot.

Optional Parameters

Optional parameters can be passed as a params::Dict{String,<:Any}. Valid keys are:

• "x-amz-Checksum": An aggregated Base-64 SHA256 checksum based on the checksums of each written block. To generate the aggregated checksum using the linear aggregation method, arrange the checksums for each written block in ascending order of their block index, concatenate them to form a single string, and then generate the checksum on the entire string using the SHA256 algorithm.
• "x-amz-Checksum-Aggregation-Method": The aggregation method used to generate the checksum. Currently, the only supported aggregation method is LINEAR.
• "x-amz-Checksum-Algorithm": The algorithm used to generate the checksum. Currently, the only supported algorithm is SHA256.
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Main.Ebs.get_snapshot_blockMethod
get_snapshot_block(block_index, block_token, snapshot_id)
get_snapshot_block(block_index, block_token, snapshot_id, params::Dict{String,<:Any})

Returns the data in a block in an Amazon Elastic Block Store snapshot.

Arguments

• block_index: The block index of the block in which to read the data. A block index is a logical index in units of 512 KiB blocks. To identify the block index, divide the logical offset of the data in the logical volume by the block size (logical offset of data/524288). The logical offset of the data must be 512 KiB aligned.
• block_token: The block token of the block from which to get data. You can obtain the BlockToken by running the ListChangedBlocks or ListSnapshotBlocks operations.
• snapshot_id: The ID of the snapshot containing the block from which to get data. If the specified snapshot is encrypted, you must have permission to use the KMS key that was used to encrypt the snapshot. For more information, see Using encryption in the Amazon Elastic Compute Cloud User Guide.
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Main.Ebs.list_changed_blocksMethod
list_changed_blocks(second_snapshot_id)
list_changed_blocks(second_snapshot_id, params::Dict{String,<:Any})

Returns information about the blocks that are different between two Amazon Elastic Block Store snapshots of the same volume/snapshot lineage.

Arguments

• second_snapshot_id: The ID of the second snapshot to use for the comparison. The SecondSnapshotId parameter must be specified with a FirstSnapshotID parameter; otherwise, an error occurs.

Optional Parameters

Optional parameters can be passed as a params::Dict{String,<:Any}. Valid keys are:

• "firstSnapshotId": The ID of the first snapshot to use for the comparison. The FirstSnapshotID parameter must be specified with a SecondSnapshotId parameter; otherwise, an error occurs.
• "maxResults": The maximum number of blocks to be returned by the request. Even if additional blocks can be retrieved from the snapshot, the request can return less blocks than MaxResults or an empty array of blocks. To retrieve the next set of blocks from the snapshot, make another request with the returned NextToken value. The value of NextToken is null when there are no more blocks to return.
• "pageToken": The token to request the next page of results. If you specify NextToken, then StartingBlockIndex is ignored.
• "startingBlockIndex": The block index from which the comparison should start. The list in the response will start from this block index or the next valid block index in the snapshots. If you specify NextToken, then StartingBlockIndex is ignored.
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Main.Ebs.list_snapshot_blocksMethod
list_snapshot_blocks(snapshot_id)
list_snapshot_blocks(snapshot_id, params::Dict{String,<:Any})

Returns information about the blocks in an Amazon Elastic Block Store snapshot.

Arguments

• snapshot_id: The ID of the snapshot from which to get block indexes and block tokens.

Optional Parameters

Optional parameters can be passed as a params::Dict{String,<:Any}. Valid keys are:

• "maxResults": The maximum number of blocks to be returned by the request. Even if additional blocks can be retrieved from the snapshot, the request can return less blocks than MaxResults or an empty array of blocks. To retrieve the next set of blocks from the snapshot, make another request with the returned NextToken value. The value of NextToken is null when there are no more blocks to return.
• "pageToken": The token to request the next page of results. If you specify NextToken, then StartingBlockIndex is ignored.
• "startingBlockIndex": The block index from which the list should start. The list in the response will start from this block index or the next valid block index in the snapshot. If you specify NextToken, then StartingBlockIndex is ignored.
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Main.Ebs.put_snapshot_blockMethod
put_snapshot_block(block_data, block_index, snapshot_id, x-amz-_checksum, x-amz-_checksum-_algorithm, x-amz-_data-_length)
put_snapshot_block(block_data, block_index, snapshot_id, x-amz-_checksum, x-amz-_checksum-_algorithm, x-amz-_data-_length, params::Dict{String,<:Any})

Writes a block of data to a snapshot. If the specified block contains data, the existing data is overwritten. The target snapshot must be in the pending state. Data written to a snapshot must be aligned with 512-KiB sectors.

Arguments

• block_data: The data to write to the block. The block data is not signed as part of the Signature Version 4 signing process. As a result, you must generate and provide a Base64-encoded SHA256 checksum for the block data using the x-amz-Checksum header. Also, you must specify the checksum algorithm using the x-amz-Checksum-Algorithm header. The checksum that you provide is part of the Signature Version 4 signing process. It is validated against a checksum generated by Amazon EBS to ensure the validity and authenticity of the data. If the checksums do not correspond, the request fails. For more information, see Using checksums with the EBS direct APIs in the Amazon Elastic Compute Cloud User Guide.
• block_index: The block index of the block in which to write the data. A block index is a logical index in units of 512 KiB blocks. To identify the block index, divide the logical offset of the data in the logical volume by the block size (logical offset of data/524288). The logical offset of the data must be 512 KiB aligned.
• snapshot_id: The ID of the snapshot. If the specified snapshot is encrypted, you must have permission to use the KMS key that was used to encrypt the snapshot. For more information, see Using encryption in the Amazon Elastic Compute Cloud User Guide..
• x-amz-_checksum: A Base64-encoded SHA256 checksum of the data. Only SHA256 checksums are supported.
• x-amz-_checksum-_algorithm: The algorithm used to generate the checksum. Currently, the only supported algorithm is SHA256.
• x-amz-_data-_length: The size of the data to write to the block, in bytes. Currently, the only supported size is 524288 bytes. Valid values: 524288

Optional Parameters

Optional parameters can be passed as a params::Dict{String,<:Any}. Valid keys are:

• "x-amz-Progress": The progress of the write process, as a percentage.
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Main.Ebs.start_snapshotMethod
start_snapshot(volume_size)
start_snapshot(volume_size, params::Dict{String,<:Any})

Creates a new Amazon EBS snapshot. The new snapshot enters the pending state after the request completes. After creating the snapshot, use PutSnapshotBlock to write blocks of data to the snapshot.

Arguments

• volume_size: The size of the volume, in GiB. The maximum size is 65536 GiB (64 TiB).

Optional Parameters

Optional parameters can be passed as a params::Dict{String,<:Any}. Valid keys are:

• "ClientToken": A unique, case-sensitive identifier that you provide to ensure the idempotency of the request. Idempotency ensures that an API request completes only once. With an idempotent request, if the original request completes successfully. The subsequent retries with the same client token return the result from the original successful request and they have no additional effect. If you do not specify a client token, one is automatically generated by the Amazon Web Services SDK. For more information, see Idempotency for StartSnapshot API in the Amazon Elastic Compute Cloud User Guide.
• "Description": A description for the snapshot.
• "Encrypted": Indicates whether to encrypt the snapshot. You can't specify Encrypted and ParentSnapshotId in the same request. If you specify both parameters, the request fails with ValidationException. The encryption status of the snapshot depends on the values that you specify for Encrypted, KmsKeyArn, and ParentSnapshotId, and whether your Amazon Web Services account is enabled for encryption by default. For more information, see Using encryption in the Amazon Elastic Compute Cloud User Guide. To create an encrypted snapshot, you must have permission to use the KMS key. For more information, see Permissions to use Key Management Service keys in the Amazon Elastic Compute Cloud User Guide.
• "KmsKeyArn": The Amazon Resource Name (ARN) of the Key Management Service (KMS) key to be used to encrypt the snapshot. The encryption status of the snapshot depends on the values that you specify for Encrypted, KmsKeyArn, and ParentSnapshotId, and whether your Amazon Web Services account is enabled for encryption by default. For more information, see Using encryption in the Amazon Elastic Compute Cloud User Guide. To create an encrypted snapshot, you must have permission to use the KMS key. For more information, see Permissions to use Key Management Service keys in the Amazon Elastic Compute Cloud User Guide.
• "ParentSnapshotId": The ID of the parent snapshot. If there is no parent snapshot, or if you are creating the first snapshot for an on-premises volume, omit this parameter. You can't specify ParentSnapshotId and Encrypted in the same request. If you specify both parameters, the request fails with ValidationException. The encryption status of the snapshot depends on the values that you specify for Encrypted, KmsKeyArn, and ParentSnapshotId, and whether your Amazon Web Services account is enabled for encryption by default. For more information, see Using encryption in the Amazon Elastic Compute Cloud User Guide. If you specify an encrypted parent snapshot, you must have permission to use the KMS key that was used to encrypt the parent snapshot. For more information, see Permissions to use Key Management Service keys in the Amazon Elastic Compute Cloud User Guide.
• "Tags": The tags to apply to the snapshot.
• "Timeout": The amount of time (in minutes) after which the snapshot is automatically cancelled if: No blocks are written to the snapshot. The snapshot is not completed after writing the last block of data. If no value is specified, the timeout defaults to 60 minutes.
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