SSD Performance Optimization: TRIM, Over-provisioning, and Internal Parallelism Principles

To optimize SSD performance, it is important to understand the principles of TRIM, Over-provisioning, and internal parallel processing. The TRIM command works when the SSD controller, OS, and file system all support it, deleting unnecessary data blocks to reduce the burden of Garbage-collection and improve write performance. Over-provisioning is a technique that sets the physical capacity larger than the logical capacity to secure spare space unused by the OS. Especially in environments with sustained random write loads, approximately 25% Over-provisioning space acts as a buffer allowing Garbage-collection to keep up with the workload, preventing performance degradation. Additionally, NCQ (Native Command Queueing) reduces latency by queuing host commands and resetting priorities, while Clustered block enables parallel access at various levels within NAND flash (channels, packages, chips, etc.) to increase data processing speed.