Why writes to disk generally wind up in your OS's disk read cache
(utoronto.ca)
Recently, someone was surprised to find out that ZFS puts disk writes in its version of a disk (read) cache, the ARC ('Adaptive Replacement Cache'). In fact this is quite common, as almost every operating system and filesystem puts ordinary writes to disk into their disk (read) cache.
Recently, someone was surprised to find out that ZFS puts disk writes in its version of a disk (read) cache, the ARC ('Adaptive Replacement Cache'). In fact this is quite common, as almost every operating system and filesystem puts ordinary writes to disk into their disk (read) cache.