Editing Cache replacement policies (section)

==== {{anchor|Adaptive replacement cache (ARC)}}Adaptive replacement cache ====
[[Adaptive replacement cache]] (ARC) constantly balances between LRU and LFU to improve the combined result.<ref name=megiddo>[[Nimrod Megiddo]] and Dharmendra S. Modha. [http://www.usenix.org/events/fast03/tech/full_papers/megiddo/megiddo.pdf ARC: A Self-Tuning, Low Overhead Replacement Cache.] FAST, 2003.</ref> It improves SLRU by using information about recently-evicted cache items to adjust the size of the protected and probationary segments to make the best use of available cache space.<ref>{{cite web |url=http://www.c0t0d0s0.org/archives/5329-Some-insight-into-the-read-cache-of-ZFS-or-The-ARC.html |url-status=dead |archive-url=https://web.archive.org/web/20090224074209/http://www.c0t0d0s0.org/archives/5329-Some-insight-into-the-read-cache-of-ZFS-or-The-ARC.html |archive-date=24 February 2009 |title=Some insight into the read cache of ZFS - or: The ARC - c0t0d0s0.org}}</ref>