Date: Tue, 1 Apr 2008 19:05:21 +0100 From: Peter Schuller <peter.schuller@infidyne.com> To: freebsd-current@freebsd.org, d@delphij.net Cc: Ivan Voras <ivoras@freebsd.org> Subject: Re: Are large RAID stripe sizes useful with FreeBSD? Message-ID: <200804012005.32581.peter.schuller@infidyne.com> In-Reply-To: <47F133AE.2010900@delphij.net> References: <fsr7fb$hl0$1@ger.gmane.org> <47F133AE.2010900@delphij.net>
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[-- Attachment #1 --] > Short answer: yes. Larger stripe sizes would allow better performance > for continuous read/write. In theory they will negatively affect small > size read/write but in practice you will notice that larger stripe size > would give better performance in almost all cases. One case where I have used large stripe sizes (though not with hardware raid and not with FreeBSD) is with concurrent small reads (small = seek is the dominant cost) on top of a device of many drives. In these cases you want to minimize the chance that a particular read will span multiple stripes, such that only a single drive will take a seek hit for a given request. This in turn maximizes actual physical concurrency when under high load (=high incoming request concurrency). -- / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller@infidyne.com>' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.8 (FreeBSD) iEYEABECAAYFAkfyeWwACgkQDNor2+l1i32B8ACgzhCc06rY/6YTWkPPOB/kVBQk Q3MAn2FqwhLtk3RoF9dhTjQ69GVf+Nw8 =a3dk -----END PGP SIGNATURE-----help
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