Date: Mon, 21 Mar 2016 21:48:14 -0600 From: Warner Losh <imp@bsdimp.com> To: bob prohaska <fbsd@www.zefox.net> Cc: freebsd-arm@freebsd.org Subject: Re: Effect of partitioning on wear-leveling Message-ID: <271EF73A-077C-44A5-8B58-721405800B9F@bsdimp.com> In-Reply-To: <20160322033417.GD83908@www.zefox.net> References: <20160321175952.GA83908@www.zefox.net> <1458586884.68920.96.camel@freebsd.org> <20160321221153.GB83908@www.zefox.net> <1458600070.68920.107.camel@freebsd.org> <1973487B-0AA7-468D-A9CC-319FBE2122F0@netgate.com> <CANCZdfrCWXAswe02Qd3tTiDL8O_4TGEWbhFqgft4Q9aKj7ixvg@mail.gmail.com> <20160322033417.GD83908@www.zefox.net>
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--Apple-Mail=_95B15785-E754-4610-8D2E-9D1794AE60F8 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii > On Mar 21, 2016, at 9:34 PM, bob prohaska <fbsd@www.zefox.net> wrote: >=20 > On Mon, Mar 21, 2016 at 08:38:13PM -0600, Warner Losh wrote: >>=20 >> One thing that people forget is that the underlying blocks that are = written >> are completely independent of what lba is used to write it. So the = notion >> that you have blocks normally part of /var or /tmp no longer makes = sense. >> Between writing blocks in different order and garbage collection, = modern SD >> cards do a good job of wear averaging. How much you've written to the = drive >> in total drives wear out these days. >>=20 >=20 > How do modern flash devices report end of life? Do problems show up in = error > logs, or does the device simply refuse to work with no warning? Undefined. Either it goes read-only or read-never. :) Warner --Apple-Mail=_95B15785-E754-4610-8D2E-9D1794AE60F8 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJW8MB+AAoJEGwc0Sh9sBEAY+UQALWv0nTW1z2mEW6yPucnNZBw iuXg0LiUWVDUVDzMVHWxizNs9tydK6JCO7LeSBX21Oz3yXJjHnR/LKmktMYGtkWC RAvawN8Cdu0ksRNLlvNPp9qx/wc2wwflCocaHSC8zur+4WL+u9VVQFtjSMzoSuyN ZqO/IEHu6w0oeW/c+eg+zA96fnwa1604cH7u1cZ8PEIak4SVFOJXqTnRbjdrcyAj XxeRjEa7lsW8LAu5x4T5hog7htlkY0OyKt9ImFSHMIDl/WvPIQVWqDKG4w5prPdx UdcIm1JfTa5nVNvgiZmEq2JQ6xnAZxL0APiObGv4J4v8P/taTdCOlX2AEAJwXlyx +IT37+iSWZgdYHXPOBvmAZywras1If677jZhuxgYJwm7dDBtjyMJtrFkpER9LGp8 3EWnz6YgB7FrvlIpycAwg77UeSpK6ll30a8X4aw8K1cjdLM/DAqvI7c26E+cb4Oj hCFzI4nvQ4K1fUrZFdCfm+PvFs3YkaHknunU2e1IPF+sq5VPimJ3rf/xhgb4v9Lg p2AdWTZ1inVorBq8awi2Qk35DCXj+NIeQhOHgn9PirFCIbaPqX+cJV0Awh2UmnbW Kc6hkSDVkdy2OMUF862gsiDnBED2FYrkjiqT7QDUoWC8DtsyXQ+TFf2hsmgNFO4L q0J+Oew4G5aD1633Qd6v =43AU -----END PGP SIGNATURE----- --Apple-Mail=_95B15785-E754-4610-8D2E-9D1794AE60F8--
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