Date: Mon, 21 Mar 2016 21:39:37 -0700 From: Russell Haley <russ.haley@gmail.com> To: Warner Losh <imp@bsdimp.com> Cc: bob prohaska <fbsd@www.zefox.net>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Effect of partitioning on wear-leveling Message-ID: <CABx9NuSfUfQudmUESX-MbA7-oL3R0s1LvvPeg-_gWVjfTAPtaw@mail.gmail.com> In-Reply-To: <271EF73A-077C-44A5-8B58-721405800B9F@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> <1973487B-0AA7-468D-A9CC-319FBE2122F0@netgate.com> <CANCZdfrCWXAswe02Qd3tTiDL8O_4TGEWbhFqgft4Q9aKj7ixvg@mail.gmail.com> <20160322033417.GD83908@www.zefox.net> <271EF73A-077C-44A5-8B58-721405800B9F@bsdimp.com>
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How long can nand go without power before it starts to lose data integrity? Thanks, Russ On Mon, Mar 21, 2016 at 8:48 PM, Warner Losh <imp@bsdimp.com> wrote: > >> On Mar 21, 2016, at 9:34 PM, bob prohaska <fbsd@www.zefox.net> wrote: >> >> On Mon, Mar 21, 2016 at 08:38:13PM -0600, Warner Losh wrote: >>> >>> 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. >>> >> >> 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 >
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