Date: Wed, 23 Mar 2016 00:45:53 -0600 From: Warner Losh <imp@bsdimp.com> To: Brett Glass <brett@lariat.net> Cc: bob prohaska <fbsd@www.zefox.net>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Effect of partitioning on wear-leveling Message-ID: <CANCZdfp5jffpHcnoDJg24stUydEssASeC4owmz7n-fmY=evGzQ@mail.gmail.com> In-Reply-To: <201603230349.VAA20311@mail.lariat.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> <201603230349.VAA20311@mail.lariat.net>
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On Tue, Mar 22, 2016 at 9:49 PM, Brett Glass <brett@lariat.net> wrote: > At 09:34 PM 3/21/2016, bob prohaska wrote: > > 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? >> > > Depends upon the device. SSDs will give you a warning via SMART; they will > begin to retire blocks and swap in reserved blocks. Simpler devices such > as memory > cards and USB sticks will simply die. I use SSDs in mission-critical > applications, > so that I have at least a fighting chance of replacing them before there's > an outage. Hope your SSDs are better at reporting things than ours. We've seen some SSDs just fail even though the previous SMART data said we've used maybe 20% of the drive's write ability.... Warner
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