The HP External Mini SAS Cable, identified by part number 407337-B21, is a connectivity solution designed for various HP ProLiant servers and storage systems. Here's an overview of its features and functionality:

1. Purpose: The External Mini SAS Cable is used to establish high-speed data connections between compatible HP servers, storage enclosures, and external storage devices. It allows for the transfer of data between devices at fast rates, enabling efficient storage and retrieval of information.

2. Connector Type: The cable typically features Mini SAS (SFF-8088) connectors on both ends. These connectors are widely used for connecting storage devices, including tape drives, disk arrays, and external storage enclosures.

3. Length: The cable has a length of 1 meter (approximately 3.28 feet). This length is suitable for connecting devices that are located in close proximity to each other within a server rack or storage environment.

4. Data Transfer Speed: The External Mini SAS Cable supports high-speed data transfer rates, making it suitable for demanding storage applications. It is commonly used with SAS (Serial Attached SCSI) and SATA (Serial ATA) storage interfaces.

5. Compatibility: The cable is compatible with various HP ProLiant servers and storage systems that feature Mini SAS connectors. It may also be compatible with third-party storage devices that support the Mini SAS interface, but compatibility should be verified before use.

6. Hot-Plug Capability: Depending on the specific configuration and hardware setup, the cable may support hot-plug functionality, allowing for the connection or disconnection of devices while the system is powered on and operational.

Overall, the HP External Mini SAS Cable provides a reliable and high-performance solution for connecting storage devices in HP ProLiant server environments, offering fast data transfer speeds and efficient storage management capabilities.