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Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0 action 0x0

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On 24.12.2021 20:31, rhkramer@gmail.com wrote:
> ...
> /dev/sdb is an HDD (which holds my "user data").
>
> Should I be worried?
>
> root@s19:~# smartctl -A /dev/sdb | grep -E '5 Realloc|183 Runtime|197
> Current|199 UDMA'
>    5 Reallocated_Sector_Ct   0x0032   100   100   000    Old_age   Always
> -       12
> root@s19:~#
>
Attribute #5 shows if the drive in question ever encountered and 
successfully remapped a 'bad block'. In your case it happened at least 
12 times.
They could've happen a few years ago, drive's firmware recovered from 
them and it was working fine ever since¹.
But they also could've happen recently within a few days and in that 
case the drive is failing and should be replaced ASAP.

For future investigation you should see full output of:
     # smartctl -A /dev/sdb

And also SMART logs, to see when was last media error encountered:
     # smartctl -l error /dev/sda

For now one thing is certain, your HDD had media errors, is not 
reliable² and you should have a good backup of data from it.
It's good idea to configure 'smartd' on all hosts to monitor health 
state of your drives and notify you by mail if something happened.


¹ I have a 320GB HDD for a five years with, I think, contaminated 
platter. When it tries to read from some LBA range it fails with media 
errors, but if I request to read past that LBA range it works fine.
As a workaround, I've repartitioned it effectively cutting off that 
faulty LBA range (around 50GB) and use it as a portable drive to carry 
some not important data and to store additional backup copies.
I always expect it to die, but it still works fine to this day.

² Any hardware, despite being new or old, could fail at any time. Always 
expect failure and have a good backup.

-- 
With kindest regards, Alexander.

⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org
⠈⠳⣄⠀⠀⠀⠀

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Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0 action  0x0 Heladu <helaheladu38@gmail.com> - 2021-12-23 23:10 +0100
  Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 "Alexander V. Makartsev" <avbetev@gmail.com> - 2021-12-23 23:40 +0100
    Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0 action 0x0 rhkramer@gmail.com - 2021-12-24 16:40 +0100
      Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 "Alexander V. Makartsev" <avbetev@gmail.com> - 2021-12-24 17:30 +0100
      Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 David Christensen <dpchrist@holgerdanske.com> - 2021-12-24 21:10 +0100
      Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0 action 0x0 gene heskett <gheskett@shentel.net> - 2021-12-24 22:30 +0100
    Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 Heladu <helaheladu38@gmail.com> - 2021-12-24 19:10 +0100
      Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 "Alexander V. Makartsev" <avbetev@gmail.com> - 2021-12-24 20:20 +0100
  Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 Dan Ritter <dsr@randomstring.org> - 2021-12-24 00:40 +0100
    Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 Heladu <helaheladu38@gmail.com> - 2021-12-24 19:10 +0100
      Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 David Christensen <dpchrist@holgerdanske.com> - 2021-12-24 21:30 +0100
        Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0 action 0x0 "Thomas Schmitt" <scdbackup@gmx.net> - 2021-12-24 22:00 +0100
          Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 David Christensen <dpchrist@holgerdanske.com> - 2021-12-25 01:20 +0100
  Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 David Christensen <dpchrist@holgerdanske.com> - 2021-12-24 00:50 +0100
    Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0 action 0x0 Glenn <ve9gj@napan.com> - 2021-12-24 16:10 +0100
  Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 James Dutton <james.dutton@gmail.com> - 2021-12-24 16:30 +0100
    Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0 action 0x0 Stefan Monnier <monnier@iro.umontreal.ca> - 2021-12-24 18:10 +0100
    Re: Slow disk reads - exception Emask 0x0 SAct 0x6b0000 SErr 0x0  action 0x0 Heladu <helaheladu38@gmail.com> - 2021-12-24 19:10 +0100

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