Date: Tue, 22 Mar 2016 17:26:35 +1100 From: Peter Jeremy <peter@rulingia.com> To: Warner Losh <imp@bsdimp.com> Cc: bob prohaska <fbsd@www.zefox.net>, freebsd-arm@freebsd.org, Ian Lepore <ian@freebsd.org> Subject: Re: Effect of partitioning on wear-leveling Message-ID: <20160322062635.GD64087@server.rulingia.com> In-Reply-To: <E985EBE6-E062-4C5E-8F85-ECB7BDE98DE8@bsdimp.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>
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--H+4ONPRPur6+Ovig Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2016-Mar-21 21:47:39 -0600, Warner Losh <imp@bsdimp.com> wrote: >So let=E2=80=99s do the math. 512MB cards tended to have write speeds of m= aybe 6MB/s. >At 6MB/s, that=E2=80=99s about 518MB/day, or one drive write per day. Most= SD cards, I think you dropped some zeroes there. 6MB/s =3D=3D 518,400MB/day =3D=3D 5= 18GB/day. That's 1000 drive writes/day - which is non-trivial. --=20 Peter Jeremy --H+4ONPRPur6+Ovig Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQJ8BAEBCgBmBQJW8OWbXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRFRUIyOTg2QzMwNjcxRTc0RTY1QzIyN0Ux NkE1OTdBMEU0QTIwQjM0AAoJEBall6Dkogs0oewP/jETUqplvA7JwDb9AlK4zc5c VMN3Gym70pWp/scbtk1X0yyWryxtvSCH+R5RyNoJGEPfPD8+VFlVbRcTHfCzRL1E UImmQVqDytn/f2DGMMVOkdHXgy+5ADTZFigw6H51kp+5xmRaWm7KfyycGcxat00H 9qTHGoTfI3hp12YzWm0ym+fJ1NCqJsnKPpDleCu4saqAOMFcqdi5PPt1p+YOm5GN 0PhuuhkFISgTMaAHyTlQxWP2mRrjgPJlmgnwCAeTRtUHog+tqmLUN8mMbfZ0PzL8 Vu6R21wJ1/moil18c83PW1NotQry6emLA7eAaj9c3rDpqwJwXhLgY6MEfvFAFzm/ Sn3ziFPNJ+HsJHvdBVehUcrtBFLy0CyUbr1/zEuD+Y4y9GgG7GsYGgGW1XMDQEz0 rley36mUV+WxFrojvEzpnxsv5TU3Q3uhaNk+22z7YHXObTYgQoYWHBU45Cyu/DiC qoSaSxopwPoBsuLS9igY5kKk8cWxa4Mb+m2RjeqwXtx4AZfEw1hzCohE7q5/IRnk +Srfon80YxZOvPj1iqyP9+V2muW47/X1eJRatBwis/m5puHU+c2qRO+IG59biXbK u5Pcgq/yDXImc5fl5jPg1HKGsmYZscNrD0tzl59Bs3YMVTayRRDPjGGi0Hb4uott ICWObwKPhdbH5G3FjvvN =0hNm -----END PGP SIGNATURE----- --H+4ONPRPur6+Ovig--
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