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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 4 Aug 2018
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      I had an ADATA SSD die on me recently after less than 1 month power-on time with negligible write throughput. Tons of reallocated sectors and it failed by refusing any further writes (after having previously caused some unexplained FS corruption a day earlier). (thread)

      4 replies 7 retweets 18 likes
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    2. Hector Martin‏ @marcan42 4 Aug 2018
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      At first I thought this was just a fluke/shitty SSD, but then I remembered something. As part of a hack, for the last 10 days of uptime or so I had a process writing a number to a file a few times per second. Maybe this caused the early death?

      1 reply 0 retweets 2 likes
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    3. Hector Martin‏ @marcan42 4 Aug 2018
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      If the FTL was utterly terrible, that could've caused it to rewrite the same flash block every time. And after wearing out a block it would go to an alternate... and if those are limited (e.g. indexed by some kind of hash scheme), it would eventually run out of alternates.

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    4. Hector Martin‏ @marcan42 4 Aug 2018
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      Clearly a poor quality SSD implementation in that case... but I wonder if this is what actually happened, as opposed to just a random early failure dud. Perhaps SSD endurance tests should test this use case. Instead of writing over the entire drive, rewrite a single sector.

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    5. Hector Martin‏ @marcan42 4 Aug 2018
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      I bet we'd see wildly different results for different brands, and many deaths well before the specified total drive write endurance. Perhaps a good metric for how good the firmware/FTL algorithm is.

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      Hector Martin‏ @marcan42 4 Aug 2018
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      There are plenty of use cases that have this "rewrite one sector repeatedly" pattern - e.g. md-raid metadata includes an event count that basically increases every time the array is written to. I wonder if anyone else has seen this kind of early death and attributed it to this.

      4:14 AM - 4 Aug 2018
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        2. bunnie‏ @bunniestudios 4 Aug 2018
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          Replying to @xabean @marcan42

          ohhhh but wait till you hear my stories about spinning rust... 😬

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        1. andrewlica‏ @sirneggles 4 Aug 2018
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          Replying to @marcan42

          given your usual flash eraseblock is 4KB (or more) this is entirely possible - a drive with PLDP or an SLC cache might be able to avoid this, and an Optane drive would be totally fine with it, though - maybe that SSD has unusually large eraseblocks and very low endurance/overprov

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        2. andrewlica‏ @sirneggles 4 Aug 2018
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          Replying to @marcan42

          you might be able to send a secure erase command to it and have it reappear with a few GB less capacity to confirm?

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        3. Hector Martin‏ @marcan42 4 Aug 2018
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          Replying to @sirneggles

          Could be - this one got RMAed, but I might try to trigger the same failure mode on the replacement and see what happens.

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