Date: Thu, 24 Jul 1997 11:42:24 +0100 From: Damian Hamill <damian@cablenet.net> To: freebsd-scsi@freebsd.org Subject: Re: New DPT Driver Message-ID: <33D73190.3B54AFBF@cablenet.net> References: <XFMail.970723232148.Shimon@i-Connect.Net> <33D71ED7.69D8BD19@cablenet.net>
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Damian Hamill wrote: > > Simon Shapiro wrote: > > > > > > Then there is the sticky issue of what stripe size to use. You, in the > > > * Most news servers use the Unix file system. Right? > > * Last I saw, ALL F/S I/O was done in 4Kbytes chunks. > > > The only way I can see 32MB stripes being even usable, is in setting them > > up as CCD stripes of this size. Of course, then you really do all your > > I/O in... 4096 bytes. > > I'm in the process of constructing some news servers and I intend to use > ccd. What figure should I use as the interleave factor. The man page > suggests that a high figure such as 65,536 should be used for news > servers. The system has 8 ST5120N (2 gig narrow, 4500 RPM) drives, and > I'm running the busses in Ultra mode (20 Mbps). I've answered this myself. With an interleave factor of 16384 a copy of /usr to the ccd file system had all disk activity on drives 1 & 5. With an interleave factor of 65536 the activity was spread around all 8 drives. regards damian -- * Damian Hamill M.D. damian@cablenet.net * CableNet & The Landscape Channel * http://www.cablenet.net/ http://www.landscapetv.com/
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