Date: Wed, 21 Oct 2015 08:27:27 -0453.75 From: "William A. Mahaffey III" <wam@hiwaay.net> Cc: freebsd-questions@freebsd.org Subject: Re: Post install FWIW Message-ID: <56279175.6000006@hiwaay.net> In-Reply-To: <20151021105210.GA31309@neutralgood.org> References: <56265636.4050208@hiwaay.net> <562685CE.5050309@sneakertech.com> <5626BAB6.4070304@hiwaay.net> <20151021105210.GA31309@neutralgood.org>
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On 10/21/15 05:58, kpneal@pobox.com wrote: > On Tue, Oct 20, 2015 at 05:11:12PM -0453, William A. Mahaffey III wrote: >> On 10/20/15 13:26, Quartz wrote: >>>> When I dd'ed /dev/zero to (re-) initialize the individual >>>> drives during install, I saw 125-ish MB/s per drive, so this is 90-ish % >>>> efficient for this write. >>> Do remember that using dd to estimate disk speeds is tricky since its >>> write pattern is somewhat non-standard. You should try a more 'real >>> world' test like rsyncing a bunch of random crap with differing sizes. >>> _______________________________________________ >>> freebsd-questions@freebsd.org mailing list >>> https://lists.freebsd.org/mailman/listinfo/freebsd-questions >>> To unsubscribe, send any mail to >>> "freebsd-questions-unsubscribe@freebsd.org" >>> >> >> *Agreed*, that's why I called it 'light benchmarking'. I will be alert >> to more data as time goes on, but this looked so promising I decided to >> spread the love, so to speak .... > Does this system have the optimization turned on where writes of all > zeros get detected and turned into just a single block on disk? > > Maybe I'm thinking of a dedup option in which case you can ignore me. Very good question, I wouldn't know, I made very few changes from the wiki page during the install. How would I check on that ? TIA & have a good one. -- William A. Mahaffey III ---------------------------------------------------------------------- "The M1 Garand is without doubt the finest implement of war ever devised by man." -- Gen. George S. Patton Jr.
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