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

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99%+ this is a failing hard drive. If you value your data use ddrescue to transfer your failing drive to a new one as step one.   Then you can do further troubleshooting.
Besides smartctl tests what I do is boot a rescue disk such as sysrescuecd on a USB stick and then run 
dd_rescue -v /dev/sdX /dev/null
Any disk errors will become apparent. Make sure you understand dd_rescue read and write agrguments. You dont want to write to your disk!!

Good Luck
Glenn

On December 23, 2021 7:40:42 PM AST, David Christensen <dpchrist@holgerdanske.com> wrote:
>On 12/23/21 1:51 PM, Heladu wrote:
>> Greetings,
>> I've been experiencing a lot of slowness in general when the system attempts
>> to read from the hard drive disk. I use Debian 10 Buster with the MATE desktop
>> environment and simple things like opening the calendar applet or right
>> clicking to open the context menu takes longer than usual. I noticed the LED
>> indicator than turns on when reading from the disk also took longer to turn
>> off, so I decided to inspect the logs and I ran into these entries:
>> 
>> Dec 23 22:33:24 sigma kernel: [ 1250.853537] ata6.00: exception Emask 0x0 SAct
>> 0x40000000 SErr 0x0 action 0x0
>> Dec 23 22:33:24 sigma kernel: [ 1250.853544] ata6.00: irq_stat 0x40000008
>> Dec 23 22:33:24 sigma kernel: [ 1250.853550] ata6.00: failed command: READ
>> FPDMA QUEUED
>> Dec 23 22:33:24 sigma kernel: [ 1250.853559] ata6.00: cmd
>> 60/08:f0:10:96:2b/00:00:01:00:00/40 tag 30 ncq dma 4096 in
>> Dec 23 22:33:24 sigma kernel: [ 1250.853559]          res
>> 41/40:00:10:96:2b/00:00:01:00:00/00 Emask 0x409 (media error) <F>
>> Dec 23 22:33:24 sigma kernel: [ 1250.853563] ata6.00: status: { DRDY ERR }
>> Dec 23 22:33:24 sigma kernel: [ 1250.853566] ata6.00: error: { UNC }
>> Dec 23 22:33:24 sigma kernel: [ 1250.855102] ata6.00: configured for UDMA/133
>> Dec 23 22:33:24 sigma kernel: [ 1250.855121] sd 5:0:0:0: [sda] tag#30 FAILED
>> Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
>> Dec 23 22:33:24 sigma kernel: [ 1250.855126] sd 5:0:0:0: [sda] tag#30 Sense
>> Key : Medium Error [current]
>> Dec 23 22:33:24 sigma kernel: [ 1250.855130] sd 5:0:0:0: [sda] tag#30 Add.
>> Sense: Unrecovered read error - auto reallocate failed
>> Dec 23 22:33:24 sigma kernel: [ 1250.855135] sd 5:0:0:0: [sda] tag#30 CDB:
>> Read(10) 28 00 01 2b 96 10 00 00 08 00
>> Dec 23 22:33:24 sigma kernel: [ 1250.855139] print_req_error: I/O error, dev
>> sda, sector 19633680
>> Dec 23 22:33:24 sigma kernel: [ 1250.855162] ata6: EH complete
>> 
>> They happen every time the system experiences slow reads. Now, I did some
>> research and I've read some possible causes like a bad SATA cable or a
>> malfunctioning HDD or PSU. I booted from a Debian installer on an USB stick
>> and I ran fsck.ext4 to check the disk and it printed the partition was clean.
>> 
>> Given that fsck didn't print anything unusual, I decided to replace the SATA
>> cable. However, it's still happening.
>> 
>> The HDD is a 1TB 3.5" WD Blue SATA drive which was bought a year ago.
>> 
>> I'm certain this is not a software problem because I've been running the
>> system a whole year without any problem. Has anyone ever experienced this? Is
>> there a way I can reliably find the faulty component (HDD, PSU...) without
>> buying a new one and hoping that solves it?
>> 
>> Thank you very much in advance.
>
>
>I own a power supply tester, so I would start by testing the power supply.
>
>
>I suggest booting a memory test USB stick and letting it run for at 
>least one pass (better, 24 hours).  Either of these should work:
>
>https://www.memtest86.com/
>
>https://www.memtest.org/
>
>
>I suggest booting Debian and running a SMART long test:
>
># smartctl -t long /dev/sda
>
>
>Check the test every hour until complete:
>
># smartctl -x /dev/sda
>
>
>Please post the final smartctl(8) report.
>
>
>David
>

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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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