Which block storage device protocol achieves the optimal cost-effective balance between I/O performance and high...

Serial Attached SCSI (SAS) is a protocol that offers a cost-effective balance between I/O performance and storage capacity, making it ideal for midrange storage applications. SAS devices provide higher data transfer rates and improved scalability compared to SATA while being more affordable than NVMe solutions, which are typically used for high-performance environments.

References:

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