Deployment
ARC is currently deployed in IBM's DS6000/DS8000 storage controllers.
Sun Microsystems's scalable file system ZFS uses a variant of ARC as an alternative to the traditional Solaris filesystem page cache in virtual memory. It has been modified to allow for locked pages that are currently in use and cannot be vacated.
PostgreSQL used ARC in its buffer manager for a brief time (version 8.0.0), but quickly replaced it with another algorithm, citing concerns over an IBM patent on ARC.
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