Date: Tue, 20 Nov 2012 11:17:50 -0500 From: Eitan Adler <eadler@freebsd.org> To: Charles Sprickman <spork@bway.net> Cc: FreeBSD FS <freebsd-fs@freebsd.org>, Stephen McKay <smckay@internode.on.net> Subject: Re: ZFS FAQ (Was: SSD recommendations for ZFS cache/log) Message-ID: <CAF6rxgkJJ=ngr0EiN3cVWzuPNce2PbCtyxCTduiNV%2B1B-DhzLw@mail.gmail.com> In-Reply-To: <48C81451-B9E7-44B5-8B8A-ED4B1D464EC6@bway.net> References: <CAFHbX1K-NPuAy5tW0N8=sJD=CU0Q1Pm3ZDkVkE%2BdjpCsD1U8_Q@mail.gmail.com> <57ac1f$gf3rkl@ipmail05.adl6.internode.on.net> <50A31D48.3000700@shatow.net> <CAF6rxgkh6C0LKXOZa264yZcA3AvQdw7zVAzWKpytfh0%2BKnLOJg@mail.gmail.com> <57ac1f$gg70bn@ipmail05.adl6.internode.on.net> <CAF6rxgnjPJ=v24p%2BkOci2qGQ1weH7r%2B8vdLmiJ_1DrxLeEzZvg@mail.gmail.com> <CAF6rxg=wjy9KTtifGrF2D6szwWKw8cX-gkJjnZRQBmFTC9BBdg@mail.gmail.com> <48C81451-B9E7-44B5-8B8A-ED4B1D464EC6@bway.net>
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On 19 November 2012 23:59, Charles Sprickman <spork@bway.net> wrote: > Wonderful to see some work on this. > > One of the great remaining zfs mysteries remains all the tunables > that are under "vfs.zfs.*". Obviously there are plenty of read-only > items there, but conflicting information gathered from random forum > posts and commit messages exist about what exactly one can do > regarding tuning beyond arc sizing. > > If you have any opportunity to work with the people who have ported > and are now maintaining zfs, it would be really wonderful to get > some feedback from them on what knobs are safe to twiddle and why. > I suspect many of the tunable items don't really have meaningful > equivalents in Sun's implementation since the way zfs falls under > the vfs layer in FreeBSD is so different. I'm working in general on the FAQ, not just on the ZFS section. I don't have the time to go in depth on this. :( I'll make you a deal though: If you could work with ZFS folk and provide the content in Q&A form I'll review it, turn it into docbook, and commit it. The entire point my FAQ commits has been to get other people involved. I can't do it all. -- Eitan Adler Source, Ports, Doc committer Bugmeister, Ports Security teams
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