Final answer:
The Log-Structured File System (LFS) is recommended for NAND Flash SSDs with a mixed workload due to its sequential write approach, efficient handling of random writes, and maintenance features like cleaning and garbage collection.
Step-by-step explanation:
For a NAND Flash Solid State Drive with a mixed workload involving file creations, deletions, random, and sequential accesses, the Log-Structured File System (LFS) would likely offer the best performance. Unlike the UNIX Original File System and the UNIX Fast File System, LFS is designed to write all modifications to disk sequentially in a log-like structure. This approach reduces seek times, which is beneficial given that NAND Flash does not have to physically move a read/write head.
LFS also handles small random writes efficiently by coalescing them into larger sequential writes, which accommodates the write amplification issue inherent to NAND Flash SSDs. For random reads, while the benefit is not as pronounced, SSDs are innately good at handling random I/O due to their lack of moving parts. Moreover, the LFS includes provisions for cleaning and garbage collection, which maintain the SSD's performance over time. Given the nature of the workload, which is mixed, LFS provides a more balanced and optimized file system for both writes and reads on an SSD.