storage//cache

- Fast buffer (usually DRAM or SLC flash) between the host and the storage medium.

Fast buffer (usually DRAM or SLC flash) between the host and the storage medium.

Write-back caches acknowledge writes before they reach the platter/NAND — boosting throughput at the cost of a power-loss risk window.

Read caches keep hot blocks in memory to avoid mechanical seek or flash read latency.

Layers include the OS page cache, drive internal DRAM, and ZFS's ARC.

Same principle as cache (nanoseconds) and cache (milliseconds), applied at the microsecond scale.