Try to read through the email thread I have started and specifically posts (replies) by alc:
http://lists.freebsd.org/pipermail/freebsd-performance/2012-August/thread.html#4640 I have followed his suggestions, and with the arc_max setting I used we still have on average free RAM ~137GB. HTH. On Tue, Mar 5, 2013 at 6:36 PM, Reed A. Cartwright <cartwri...@asu.edu>wrote: > I have a 512GB memory system that has a 480GB (or so) L2ARC, and a > raidz2 storage pool. No dedup or compression is enabled. Although, I > will enable compression in the future. > > By default vfs.zfs.arc_max is about 300GB and the L2ARC is hardly touched. > > I've seen a couple hints recently on the mailing lists that having too > big of an ARC can be a performance hit because it takes a long time to > inspect it when something needs to integrate over the entries. > > I've also had issues with running 9.1 on this machine due to zfs > deadlocks or stalls and am currently "stuck" using 9.0 with no issue. > > So, I was wondering if shrinking the ARC would potentially help and > what should I shrink it to? > > I am thinking about setting vfs.zfs.arc_max to 64GB. > > Does anyone have an opinion? > > > -- > Reed A. Cartwright, PhD > Assistant Professor of Genomics, Evolution, and Bioinformatics > School of Life Sciences > Center for Evolutionary Medicine and Informatics > The Biodesign Institute > Arizona State University > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscr...@freebsd.org" > _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"