statement
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abstract
foreword
NVMe 1.4 provides a new capability for SSDs to report preferred write alignment and write granularity information to upper-level operating systems and drivers. Although the 4K alignment of solid-state drives is widely known, you may not know that the current physical page size of flash memory is usually 16KB, and the capacity of a flash memory block is as high as ten megabytes.
If the write granularity is too small, the solid-state hard disk needs to perform the repetitive work of first reading, then modifying, and then writing. Performance and efficiency, reduced flash wear and increased lifespan.
1 concept
NVMe SSDs behave like regular block devices, with a sector size typically 512 bytes or 4KB at the host level . The native page size of modern NAND flash memory is greater than 4KB, and a common page size is