Configuring Virtual Flash Resource on a Virtual Machine

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When configuring a virtual flash resource on a virtual machine, two options that are available are SCSI Controller and Block Size. Let's look at these options in more detail:

1. SCSI Controller: When configuring a virtual flash resource, you must select a SCSI controller type for the virtual disk. vSphere supports different SCSI controller types, including BusLogic, LSI Logic, and LSI Logic SAS. You must select a SCSI controller type that is supported by the operating system running on the virtual machine. The SCSI controller is responsible for communicating with the virtual flash resource and presenting it to the virtual machine as a storage device.

2. Block Size: The block size determines the size of the blocks that are used to store data on the virtual flash resource. You can select a block size of 4 KB, 8 KB, 16 KB, or 32 KB. The block size affects the performance of the virtual flash resource, with larger block sizes generally providing better performance for larger I/O operations.

The other two options mentioned in the question, Reservation and Limit, are not applicable when configuring a virtual flash resource. Reservation and Limit are used when configuring resource allocation for virtual machines, such as CPU and memory. They do not apply to virtual flash resources.