D-ISM-FN-01 Exam Dumps : Dell Information Storage and Management Foundations v2 Exam

Aread missoccurs when the data requested by the host isnotavailable in the cache. As a result, the storage system must fetch the data from the slower disk storage (back-end), leading to higher latency.

Cache hit:Data is already in cache → faster response.

Cache miss (read miss):Data not in cache → fetched from the disk.

Storage Class Memory (SCM) represents a new class of storage technology that bridges the gap between traditional DRAM and NAND flash memory. SCM offers significantly lower latency and higher endurance compared to NAND flash, making it the highest-performing storage medium currently available. Due to its advanced technology and performance characteristics, SCM is also the most expensive among the listed options.

FC (Fibre Channel):A network protocol used for high-speed data transfer, not a type of disk device.

SATA (Serial ATA):Commonly used in consumer-grade storage; offers lower performance and cost.

SAS (Serial Attached SCSI):Offers better performance than SATA but still lags behind SSDs and SCM.

SSD (Solid State Drive):Provides faster data access than HDDs but is outperformed by SCM.

SCM (Storage Class Memory):Combines the speed of DRAM with the persistence of NAND, offering unparalleled performance.

Storage Class Memory (SCM) bridges the gap between DRAM and NAND flash memory. It offers faster access times than flash memory but is still slower than DRAM. SCM provides non-volatile storage with performance characteristics closer to DRAM, making it suitable for applications requiring high-speed data access.