Date: Fri, 31 Oct 2008 14:50:10 +1000 From: Danny Carroll <fbsd@dannysplace.net> To: Andrew Snow <andrew@modulus.org> Cc: freebsd-fs@freebsd.org, Jeremy Chadwick <koitsu@FreeBSD.org> Subject: Re: Areca vs. ZFS performance testing. Message-ID: <490A8E82.1080901@dannysplace.net> In-Reply-To: <490A8D23.6030309@modulus.org> References: <490A782F.9060406@dannysplace.net> <20081031033208.GA21220@icarus.home.lan> <490A849C.7030009@dannysplace.net> <20081031043412.GA22289@icarus.home.lan> <490A8D23.6030309@modulus.org>
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Andrew Snow wrote: > Its probably worth playing with vfs.zfs.cache_flush_disable when using > the hardware RAID. > > By default, ZFS will flush the entire hardware cache just to make sure > the ZFS Intent Log (ZIL) has been written. > > This isn't so bad on a group of hard disks with small caches, but bad if > you have 256mb of controller write cache. Ok.
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