Date: Sun, 9 Mar 1997 23:25:14 -0800 (PST) From: Tom Samplonius <tom@sdf.com> To: Brian Tao <taob@risc.org> Cc: "matthew c. mead" <mmead@goof.com>, isp@freebsd.org, hackers@freebsd.org Subject: Re: freebsd as a news server? Message-ID: <Pine.NEB.3.94.970309232108.6880E-100000@misery.sdf.com> In-Reply-To: <Pine.BSF.3.95.970309015111.22711A-100000@alpha.risc.org>
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On Sun, 9 Mar 1997, Brian Tao wrote: > On Sat, 8 Mar 1997, matthew c. mead wrote: > > > > I've got the striping factor set to 255 blocks (per a suggestion in > > the docs for ccd). > > For a news server, a stripe size of 65536 blocks (32 megabytes) > will give you optimal results, due to the mechanics of UFS's file and > directory layout in a cylinder group (which by default is 32MB). That > ccd configuration will tend to localize all disk access related to > reading a random file to a single drive in your array, thus allowing > maximum concurrency across the RAID. This is why having many smaller > disks is better than having a few larger disks. > -- > Brian Tao (BT300, taob@risc.org) > "Though this be madness, yet there is method in't" > > > But isn't choosing block and fragment sizes very important as well? The default of 8192 and 1024 seems fast, but seems to be wasting space. I remember Joe Greco mentioning something about disappointing file system performance if these are messed with the wrong way. Tom
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