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Re: bad sectors on disk

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Hi,

Ritesh Raj Sarraf wrote:
> Thomas: In the last responses, you asked if there was any Sense key.
> This time, I do have them.
> 
> [498601.069250] sd 0:0:0:0: [sda] UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
> [498601.077151] sd 0:0:0:0: [sda] Sense Key : 0x3 [current] 
> [498601.082621] sd 0:0:0:0: [sda] ASC=0x11 ASCQ=0x0 
> [498601.087452] sd 0:0:0:0: [sda] CDB: opcode=0x28 28 00 d8 7d 5a 8f 00 00 08 00
> [498601.094711] blk_update_request: critical medium error, dev sda, sector 3632093839
> ...
> [498604.440543] sd 0:0:0:0: [sda] CDB: opcode=0x28 28 00 d8 7d 5a 8f 00 00 08 00
> ...
> [498607.733232] sd 0:0:0:0: [sda] CDB: opcode=0x28 28 00 d8 7d 5a 8f 00 00 08 00

This one looks much more like a conventional bad spot.

- Other than previously, "driverbyte" is not 0 but 8.
  This means that the disk firmware indicated SCSI Sense Data
  (i.e. error codes) [1]:
    "0x08 | DRIVER_SENSE   | had sense information available"

- "Sense Key : 0x3" categorizes the problem as error of the medium.
  "ASC=0x11 ASCQ=0x0" means according to [2]:
    "UNRECOVERED READ ERROR 

- This time, the error happens reproducibly at the same block address
  0xd87d5a8f = 3632093839.
  (The first line of your log snippet shows decimal address 3632093759.
   Is this the end of another group of failed "CDB: opcode=0x28" ?)


> Does it suggest bad sectors ?

I'd say that this is something different than your previous problem.
If the following command reliably reports i/o error and causes messages
in the system log, then badblock scan and treatment would be indicated:

  dd if=/dev/sda of=/dev/null bs=512 count=1 skip=3632093839

Especially since the volatile errors did not show up any more.


[1] http://www.tldp.org/HOWTO/archived/SCSI-Programming-HOWTO/SCSI-Programming-HOWTO-21.html#ss21.5
[2] http://www.tldp.org/HOWTO/archived/SCSI-Programming-HOWTO/SCSI-Programming-HOWTO-22.html#ss22.1


Have a nice day :)

Thomas

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bad sectors on disk Ritesh Raj Sarraf <rrs@researchut.com> - 2016-02-09 10:00 +0100
  Re: bad sectors on disk Hans <hans.ullrich@loop.de> - 2016-02-09 10:20 +0100
  Re: bad sectors on disk "Thomas Schmitt" <scdbackup@gmx.net> - 2016-02-09 11:20 +0100
    Re: bad sectors on disk Ritesh Raj Sarraf <rrs@researchut.com> - 2016-02-09 12:00 +0100
      Re: bad sectors on disk "Thomas Schmitt" <scdbackup@gmx.net> - 2016-02-09 13:00 +0100
        Re: bad sectors on disk Eike Lantzsch <zp6cge@gmx.net> - 2016-02-09 13:30 +0100
          Re: bad sectors on disk Eike Lantzsch <zp6cge@gmx.net> - 2016-02-09 13:50 +0100
        Re: bad sectors on disk Ritesh Raj Sarraf <rrs@researchut.com> - 2016-02-10 15:20 +0100
          Re: bad sectors on disk "Thomas Schmitt" <scdbackup@gmx.net> - 2016-02-10 15:40 +0100
      Re: bad sectors on disk jdd <jdd@dodin.org> - 2016-02-09 13:10 +0100
  Re: bad sectors on disk Jonathan Dowland <jmtd@debian.org> - 2016-02-09 16:20 +0100
  Re: bad sectors on disk David Christensen <dpchrist@holgerdanske.com> - 2016-02-09 20:30 +0100
    Re: bad sectors on disk "Thomas Schmitt" <scdbackup@gmx.net> - 2016-02-09 21:00 +0100
  Re: [computers] bad sectors on disk TWS Admin <tws@wilderness.org.au> - 2016-02-11 05:00 +0100
    Re: [computers] bad sectors on disk Joseph Loo <jloo20111002@gmail.com> - 2016-02-11 05:10 +0100
      Re: [computers] bad sectors on disk David Wright <deblis@lionunicorn.co.uk> - 2016-02-12 05:20 +0100
        Re: bad sectors on disk "Thomas Schmitt" <scdbackup@gmx.net> - 2016-02-12 08:50 +0100
          Re: bad sectors on disk Gene Heskett <gheskett@shentel.net> - 2016-02-12 09:30 +0100
            SATA cables David Christensen <dpchrist@holgerdanske.com> - 2016-02-12 18:30 +0100
              Re: SATA cables Ric Moore <wayward4now@gmail.com> - 2016-02-14 01:20 +0100
                Re: SATA cables Gene Heskett <gheskett@shentel.net> - 2016-02-14 02:00 +0100
                Re: SATA cables David Christensen <dpchrist@holgerdanske.com> - 2016-02-14 05:40 +0100
                Re: SATA cables Ric Moore <wayward4now@gmail.com> - 2016-02-14 17:30 +0100
          Re: bad sectors on disk Ritesh Raj Sarraf <rrs@researchut.com> - 2016-02-16 14:40 +0100
            Re: bad sectors on disk Ritesh Raj Sarraf <rrs@researchut.com> - 2016-02-16 15:00 +0100
            Re: bad sectors on disk "Thomas Schmitt" <scdbackup@gmx.net> - 2016-02-16 15:10 +0100
        Re: [computers] bad sectors on disk jdd <jdd@dodin.org> - 2016-02-12 09:30 +0100

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