SCSI Controller

 In VMWare, a SCSI (Small Computer System Interface) controller acts as a bridge between the guest operating system and the virtual storage, facilitating communication and data transfer. It is a virtualized version of a physical SCSI controller, offering various benefits like improved performance, increased device support, bus sharing, making it suitable for demanding workloads. 

Key Features and Benefits:

• Performance:

  SCSI controllers generally offer better performance than IDE controllers due to their efficiency in handling I/O operations, especially in virtual machines with multiple disks. 
Device Support:
They can manage a larger number of storage devices (up to 15 per controller) and offer support for various devices like disk drives, tape drives, and optical devices. 
Bus Sharing:
SCSI controllers can share storage devices across multiple virtual machines, allowing for efficient resource utilization and potential data sharing. 
Raw Disk Mapping (RDM):
SCSI controllers are essential for using raw disk mapping, which allows a virtual machine to directly access a physical disk or storage volume. 
Paravirtualization:
VMware offers paravirtualized SCSI adapters, which are designed to provide even higher performance and lower CPU utilization, particularly in environments with I/O-intensive applications. 
Controller Types:
VMware supports various SCSI controller types, including LSI Logic SAS, LSI Logic Parallel, and Paravirtualized, each with its own characteristics and performance characteristics. 
Configuration:
SCSI controllers can be configured to optimize performance, and you can add or change the controller type, assign virtual disks to different controllers, and configure bus sharing