Update min DIU value

Author: Clare Zheng (Shanghai Wicresoft Co Ltd)

articles/data-factory/copy-activity-performance-features.md

@@ -8,7 +8,7 @@ ms.service: data-factory
 ms.subservice: data-movement
 ms.topic: conceptual
 ms.custom: synapse
-ms.date: 01/05/2024
+ms.date: 06/17/2024
 
 ---
 
@@ -28,14 +28,14 @@ When you select a Copy activity on the pipeline editor canvas and choose the Set
 
 A Data Integration Unit is a measure that represents the power (a combination of CPU, memory, and network resource allocation) of a single unit within the service. Data Integration Unit only applies to [Azure integration runtime](concepts-integration-runtime.md#azure-integration-runtime), but not [self-hosted integration runtime](concepts-integration-runtime.md#self-hosted-integration-runtime).
 
-The allowed DIUs to empower a copy activity run is **between 2 and 256**. If not specified or you choose "Auto" on the UI, the service dynamically applies the optimal DIU setting based on your source-sink pair and data pattern. The following table lists the supported DIU ranges and default behavior in different copy scenarios:
+The allowed DIUs to empower a copy activity run is **between 4 and 256**. If not specified or you choose "Auto" on the UI, the service dynamically applies the optimal DIU setting based on your source-sink pair and data pattern. The following table lists the supported DIU ranges and default behavior in different copy scenarios:
 
 | Copy scenario | Supported DIU range | Default DIUs determined by service |
 |:--- |:--- |---- |
-| Between file stores |- **Copy from or to single file**: 2-4 <br>- **Copy from and to multiple files**: 2-256 depending on the number and size of the files <br><br>For example, if you copy data from a folder with 4 large files and choose to preserve hierarchy, the max effective DIU is 16; when you choose to merge file, the max effective DIU is 4. |Between 4 and 32 depending on the number and size of the files |
-| From file store to non-file store |- **Copy from single file**: 2-4 <br/>- **Copy from multiple files**: 2-256 depending on the number and size of the files <br/><br/>For example, if you copy data from a folder with 4 large files, the max effective DIU is 16. |- **Copy into Azure SQL Database or Azure Cosmos DB**: between 4 and 16 depending on the sink tier (DTUs/RUs) and source file pattern<br>- **Copy into Azure Synapse Analytics** using PolyBase or COPY statement: 2<br>- Other scenario: 4 |
-| From non-file store to file store |- **Copy from partition-option-enabled data stores** (including [Azure Database for PostgreSQL](connector-azure-database-for-postgresql.md#azure-database-for-postgresql-as-source), [Azure SQL Database](connector-azure-sql-database.md#azure-sql-database-as-the-source), [Azure SQL Managed Instance](connector-azure-sql-managed-instance.md#sql-managed-instance-as-a-source), [Azure Synapse Analytics](connector-azure-sql-data-warehouse.md#azure-synapse-analytics-as-the-source), [Oracle](connector-oracle.md#oracle-as-source), [Netezza](connector-netezza.md#netezza-as-source), [SQL Server](connector-sql-server.md#sql-server-as-a-source), and [Teradata](connector-teradata.md#teradata-as-source)): 2-256 when writing to a folder, and 2-4 when writing to one single file. Note per source data partition can use up to 4 DIUs.<br>- **Other scenarios**: 2-4 |- **Copy from REST or HTTP**: 1<br/>- **Copy from Amazon Redshift** using UNLOAD: 2<br>- **Other scenario**: 4 |
-| Between non-file stores |- **Copy from partition-option-enabled data stores** (including [Azure Database for PostgreSQL](connector-azure-database-for-postgresql.md#azure-database-for-postgresql-as-source), [Azure SQL Database](connector-azure-sql-database.md#azure-sql-database-as-the-source), [Azure SQL Managed Instance](connector-azure-sql-managed-instance.md#sql-managed-instance-as-a-source), [Azure Synapse Analytics](connector-azure-sql-data-warehouse.md#azure-synapse-analytics-as-the-source), [Oracle](connector-oracle.md#oracle-as-source), [Netezza](connector-netezza.md#netezza-as-source), [SQL Server](connector-sql-server.md#sql-server-as-a-source), and [Teradata](connector-teradata.md#teradata-as-source)): 2-256 when writing to a folder, and 2-4 when writing to one single file. Note per source data partition can use up to 4 DIUs.<br/>- **Other scenarios**: 2-4 |- **Copy from REST or HTTP**: 1<br>- **Other scenario**: 4 |
+| Between file stores |- **Copy from or to single file**: 4 <br>- **Copy from and to multiple files**: 4-256 depending on the number and size of the files <br><br>For example, if you copy data from a folder with 4 large files and choose to preserve hierarchy, the max effective DIU is 16; when you choose to merge file, the max effective DIU is 4. |Between 4 and 32 depending on the number and size of the files |
+| From file store to non-file store |- **Copy from single file**: 4 <br/>- **Copy from multiple files**: 4-256 depending on the number and size of the files <br/><br/>For example, if you copy data from a folder with 4 large files, the max effective DIU is 16. |- **Copy into Azure SQL Database or Azure Cosmos DB**: between 4 and 16 depending on the sink tier (DTUs/RUs) and source file pattern<br>- **Copy into Azure Synapse Analytics** using PolyBase or COPY statement: 4<br>- Other scenario: 4 |
+| From non-file store to file store |- **Copy from partition-option-enabled data stores** (including [Azure Database for PostgreSQL](connector-azure-database-for-postgresql.md#azure-database-for-postgresql-as-source), [Azure SQL Database](connector-azure-sql-database.md#azure-sql-database-as-the-source), [Azure SQL Managed Instance](connector-azure-sql-managed-instance.md#sql-managed-instance-as-a-source), [Azure Synapse Analytics](connector-azure-sql-data-warehouse.md#azure-synapse-analytics-as-the-source), [Oracle](connector-oracle.md#oracle-as-source), [Netezza](connector-netezza.md#netezza-as-source), [SQL Server](connector-sql-server.md#sql-server-as-a-source), and [Teradata](connector-teradata.md#teradata-as-source)): 4-256 when writing to a folder, and 4 when writing to one single file. Note per source data partition can use up to 4 DIUs.<br>- **Other scenarios**: 4 |- **Copy from REST or HTTP**: 1<br/>- **Copy from Amazon Redshift** using UNLOAD: 4<br>- **Other scenario**: 4 |
+| Between non-file stores |- **Copy from partition-option-enabled data stores** (including [Azure Database for PostgreSQL](connector-azure-database-for-postgresql.md#azure-database-for-postgresql-as-source), [Azure SQL Database](connector-azure-sql-database.md#azure-sql-database-as-the-source), [Azure SQL Managed Instance](connector-azure-sql-managed-instance.md#sql-managed-instance-as-a-source), [Azure Synapse Analytics](connector-azure-sql-data-warehouse.md#azure-synapse-analytics-as-the-source), [Oracle](connector-oracle.md#oracle-as-source), [Netezza](connector-netezza.md#netezza-as-source), [SQL Server](connector-sql-server.md#sql-server-as-a-source), and [Teradata](connector-teradata.md#teradata-as-source)): 4-256 when writing to a folder, and 4 when writing to one single file. Note per source data partition can use up to 4 DIUs.<br/>- **Other scenarios**: 4 |- **Copy from REST or HTTP**: 1<br>- **Other scenario**: 4 |
 
 You can see the DIUs used for each copy run in the copy activity monitoring view or activity output. For more information, see [Copy activity monitoring](copy-activity-monitoring.md). To override this default, specify a value for the `dataIntegrationUnits` property as follows. The *actual number of DIUs* that the copy operation uses at run time is equal to or less than the configured value, depending on your data pattern.