Date: Fri, 9 Jun 2006 13:28:51 -0400 From: Mikhail Teterin <mi+mx@aldan.algebra.com> To: Scott Long <scottl@samsco.org> Cc: fs@freebsd.org Subject: single disk vs. RAID5 (amr) Message-ID: <200606091328.52183.mi%2Bmx@aldan.algebra.com> In-Reply-To: <4489ADC9.3090809@samsco.org> References: <20060609065656.31225.qmail@web30313.mail.mud.yahoo.com> <200606091313.04913.mi%2Bmx@aldan.algebra.com> <4489ADC9.3090809@samsco.org>
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[Subject changed] п'ятниця 09 червень 2006 13:20, Scott Long написав: > > I never benchmarked the speed on the single drives, other than to compare > > with my RAID5 array (which puzzlingly always loses to a single drive, but > > that's a different story). > > All depends on access alignment and cache behaviour. Well, this does not tell me much :-( I compare a single disk vs. a RAID5 array of 6 such disks joined using amr(4). I tried to figure out the best FS-parameters for the RAID, but whatever I tried, it was always quite inferior to the the single drive -- on both reading and writing. Perhaps, adding the battery-backup option to the RAID card would improve things, but I expected it to be faster even without it. -mi
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