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danluu's profile
Dan Luu
Dan Luu
Dan Luu
@danluu

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Dan Luu

@danluu

https://patreon.com/danluu 

danluu.com
Joined December 2008

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    1. Dan Luu‏ @danluu 13 Dec 2015
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      Want to write to your filesystem safely? No worries, the manpage has all the latest rumors http://danluu.com/file-consistency/ …pic.twitter.com/uhGU1LAM2w

      17 replies 457 retweets 799 likes
      Show this thread
    2. Dan Luu‏ @danluu 17 Sep 2017
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      New 12TB=96Tb HD. Non-recoverable error rate: 1e-15 per bit. E[complete drive reads per error]: 10 https://www.wdc.com/content/dam/wdc/website/downloadable_assets/eng/spec_data_sheet/2879-800074.pdf …pic.twitter.com/W3ztIYiudi

      3 replies 9 retweets 22 likes
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    3. Dan Luu‏ @danluu 17 Sep 2017
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      In the fine print, they say their annualized failure rate calculation is based on a workload of 219TB/yr for a 12TB drive 😂

      3 replies 6 retweets 16 likes
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      Dan Luu‏ @danluu 21 Sep 2017
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      It's a little concerning that the APFS devs say data checksums are unneeded because HDs are reliable, contradicting every study on HD errorspic.twitter.com/uHNdsIwhXp

      9:20 AM - 21 Sep 2017
      • 17 Retweets
      • 68 Likes
      • Paul Dokas Jemma alex Matt Sylvia Kyle Howells Richard Newman Erik Novales rmloveland Real AI
      8 replies 17 retweets 68 likes
        1. New conversation
        2. Tor Myklebust‏ @t2mykleb 24 Sep 2017
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          Replying to @danluu

          What are you doing that's 111 columns wide?

          1 reply 0 retweets 0 likes
        3. Dan Luu‏ @danluu 28 Sep 2017
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          Replying to @t2mykleb

          Resizing something to an aspect ratio that works kinda ok for twitter images :P

          0 replies 0 retweets 1 like
        4. End of conversation
        1. New conversation
        2. Kakurady‏ @kakurady 22 Sep 2017
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          Replying to @danluu

          *SSDs are reliable Which is why they're not releasing it for HDDs? Sounds like a terrible replacement for a general FS like HFS.

          1 reply 0 retweets 1 like
        3. Dan Luu‏ @danluu 22 Sep 2017
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          Replying to @kakurady

          Untrue. In one study, between 20% and 90% of drives had uncorrectable errors after 3 years of use (model dependent) https://www.usenix.org/system/files/conference/fast16/fast16-papers-schroeder.pdf …pic.twitter.com/hOpiRdmMkF

          1 reply 0 retweets 2 likes
        4. 1 more reply
        1.  🚲 🚎 🥑‏ @crzwdjk 21 Sep 2017
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          Replying to @danluu

          NAND flash has ECC because you need it in case a couple too many electrons decide to tunnel there way to freedom.

          0 replies 2 retweets 3 likes
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        1. Yann Collet‏ @Cyan4973 21 Sep 2017
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          Replying to @danluu

          On the other hand, it's not uncommon for an ad-hoc verification mechanism to have its own share of shortcomings, adding noise to the formula

          0 replies 0 retweets 3 likes
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        1. New conversation
        2. Peter Marreck‏ @pmarreck 21 Sep 2017
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          Replying to @danluu

          It was exactly because of this that I wondered if there was a market for a tool that would take up a few extra % of your drive to do FEC

          2 replies 0 retweets 0 likes
        3. Zan Lynx‏ @ZanLynx 21 Sep 2017
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          Replying to @pmarreck @danluu

          That's sort of been done. While I'm sure there are better sources, I found this with a quick search:https://access.redhat.com/solutions/41548 

          1 reply 0 retweets 1 like
        4. 1 more reply
        1. Jo‏ @GreatWhiskahs 21 Sep 2017
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          Replying to @danluu

          Too much kool aid apparently

          0 replies 0 retweets 1 like
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        1. Martín Beauchamp‏ @ChairmanTubeAmp 21 Sep 2017
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          Replying to @danluu

          It's almost like they've never heard of ZFS, a filesystem that assumes the opposite.

          0 replies 0 retweets 1 like
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