Date: Tue, 22 Mar 2016 09:42:10 -0600 From: Ian Lepore <ian@freebsd.org> To: Peter Jeremy <peter@rulingia.com>, Warner Losh <imp@bsdimp.com> Cc: freebsd-arm@freebsd.org Subject: Re: Effect of partitioning on wear-leveling Message-ID: <1458661330.1091.11.camel@freebsd.org> In-Reply-To: <20160322062635.GD64087@server.rulingia.com> References: <20160321175952.GA83908@www.zefox.net> <1458586884.68920.96.camel@freebsd.org> <20160321221153.GB83908@www.zefox.net> <1458600070.68920.107.camel@freebsd.org> <20160322032832.GC83908@www.zefox.net> <E985EBE6-E062-4C5E-8F85-ECB7BDE98DE8@bsdimp.com> <20160322062635.GD64087@server.rulingia.com>
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On Tue, 2016-03-22 at 17:26 +1100, Peter Jeremy wrote: > On 2016-Mar-21 21:47:39 -0600, Warner Losh <imp@bsdimp.com> wrote: > > So let¢s do the math. 512MB cards tended to have write speeds of > > maybe 6MB/s. > > At 6MB/s, that¢s about 518MB/day, or one drive write per day. Most > > SD cards, > > I think you dropped some zeroes there. 6MB/s == 518,400MB/day == > 518GB/day. > That's 1000 drive writes/day - which is non-trivial. > Because the hardware I was using was old and buggy (byte-swapping all data in software, etc), the actual IO rate was just under 1MB/sec, but that's still closer to the kind of numbers you mention than to Warner's. -- Ian
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