Date: Fri, 9 Jan 2009 09:46:56 +0100 From: "Koen Smits" <kgysmits@gmail.com> To: fbsd@dannysplace.net Cc: freebsd-fs@freebsd.org, Jeremy Chadwick <koitsu@freebsd.org>, freebsd-hardware@freebsd.org Subject: Re: Areca vs. ZFS performance testing. Message-ID: <b072dc420901090046v77bc5407xacda5e65fc6ad7bf@mail.gmail.com> In-Reply-To: <4966B6B1.8020502@dannysplace.net> References: <20081031033208.GA21220@icarus.home.lan> <491C5AA7.1030004@samsco.org> <491C9535.3030504@dannysplace.net> <CEDCDD3E-B908-44BF-9D00-7B73B3C15878@anduin.net> <4920E1DD.7000101@dannysplace.net> <F55CD13C-8117-4D34-9C35-618D28F9F2DE@spry.com> <20081117070818.GA22231@icarus.home.lan> <496549D9.7010003@dannysplace.net> <b072dc420901072348n7d094937u89b6d24959f8ae3d@mail.gmail.com> <4966B6B1.8020502@dannysplace.net>
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Those numbers are pretty good, right? Who needs onboard XOR anyway :) On Fri, Jan 9, 2009 at 03:30, Danny Carroll <fbsd@dannysplace.net> wrote: > Koen Smits wrote: > > My guess is it probably has to do with the way ZFS does cache flushes: > > > http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Cache_Flushes > > It might be worth it to disable the forced flushing and test again, if > > you feel like it. > > I've just done this and the results are on the same page: > > http://www.dannysplace.net/quickweb/filesystem%20tests.htm > The Excel version is here: > > http://www.dannysplace.net/quickweb/filesystem%20tests.xls > > It is a major improvement but I do not know 100% for sure if the disks > are protected by the write cache/battery backup when in Passthrough mode. > > When creating a passthrough disk the "Volume Cache Mode" can be set to > "Write Back" or "Write Through". This makes me feel as though the cache > is being used and that when the cache is used, so is the BBU. But I > cannot be 100% sure. I will send an email to Areca support to ask. > > -D >
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