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

["Alexander V. Makartsev" <avbetev@gmail.com>]

On 24.12.2021 02:51, 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:
> ...
> 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.
>
>     
    You can review SMART attributes which keep track of device's health
    and metrics.
    This utility is part of "smartmontools" package.
    Run this one-liner to see values of relevant attributes:
        $ sudo smartctl -A /dev/sda | grep -E '5
      Realloc|183 Runtime|197 Current|199 UDMA'
    
    Here is what they should like on perfectly fine hard drive:
        $ sudo smartctl -A /dev/sda | grep -E '5
      Realloc|183 Runtime|197 Current|199 UDMA'
            5 Reallocated_Sector_Ct   0x0033   100   100   010   
      Pre-fail  Always       -       0
          183 Runtime_Bad_Block       0x0032   100   100   000   
      Old_age   Always       -       0
          197 Current_Pending_Sector  0x0012   100   100   000   
      Old_age   Always       -       0
          199 UDMA_CRC_Error_Count    0x003e   200   200   000   
      Old_age   Always       -       0
    
    Raw values are displayed on the right and they all zeroes. Post the
    output you got with next reply.
    You should backup or "ddrescue" your data from this drive and
    RMA\replace it or better switch to SSD disk.
    
-- 
With kindest regards, Alexander.

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