Re: question to btrfs scrub

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

On 2023/6/30 17:59, Bernd Lentes wrote:
>
>> -----Original Message-----
>> From: Qu Wenruo <quwenruo.btrfs@gmx.com>
>> Sent: Thursday, June 29, 2023 11:08 AM
>> To: Bernd Lentes <bernd.lentes@helmholtz-muenchen.de>; linux-btrfs <linux-
>> btrfs@vger.kernel.org>
>> Subject: Re: question to btrfs scrub
>
>> - Kernel version
> 5.14.21-150400.24.63-default
>
>> - SMART info
> ha-idg-1:/mnt/sdc1/ha-idg-1/image # smartctl -T verypermissive -a /dev/sdc
> smartctl 7.2 2021-09-14 r5237 [x86_64-linux-5.14.21-150400.24.63-default] (SUSE RPM)
> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
>
> Read Device Identity failed: scsi error unsupported field in scsi command
>
> === START OF INFORMATION SECTION ===
> Device Model:     [No Information Found]
> Serial Number:    [No Information Found]
> Firmware Version: [No Information Found]
> Device is:        Not in smartctl database [for details use: -P showall]
> ATA Version is:   [No Information Found]
> Local Time is:    Fri Jun 30 11:52:26 2023 CEST
> SMART support is: Ambiguous - ATA IDENTIFY DEVICE words 82-83 don't show if SMART supported.
> SMART support is: Ambiguous - ATA IDENTIFY DEVICE words 85-87 don't show if SMART is enabled.
>                    Checking to be sure by trying SMART RETURN STATUS command.
> SMART support is: Unknown - Try option -s with argument 'on' to enable it.
> Read SMART Data failed: scsi error unsupported field in scsi command
>
> === START OF READ SMART DATA SECTION ===
> SMART Status command failed: scsi error unsupported field in scsi command
> SMART overall-health self-assessment test result: UNKNOWN!
> SMART Status, Attributes and Thresholds cannot be read.
>
> Read SMART Error Log failed: scsi error unsupported field in scsi command
>
> Read SMART Self-test Log failed: scsi error unsupported field in scsi command
>
> Selective Self-tests/Logging not supported
>
> ha-idg-1:/mnt/sdc1/ha-idg-1/image #
> ha-idg-1:/mnt/sdc1/ha-idg-1/image # smartctl -T verypermissive -s on /dev/sdc
> smartctl 7.2 2021-09-14 r5237 [x86_64-linux-5.14.21-150400.24.63-default] (SUSE RPM)
> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
>
> Read Device Identity failed: scsi error unsupported field in scsi command
>
> SMART support is: Ambiguous - ATA IDENTIFY DEVICE words 82-83 don't show if SMART supported.
> SMART support is: Ambiguous - ATA IDENTIFY DEVICE words 85-87 don't show if SMART is enabled.
>                    Checking to be sure by trying SMART RETURN STATUS command.
> SMART support is: Unknown - Try option -s with argument 'on' to enable it.=== START OF ENABLE/DISABLE COMMANDS SECTION ===
> SMART Enable failed: scsi error unsupported field in scsi command
>
> SMART not available ?

That maybe caused by whatever the controller of the USB enclosure.

>
>> - HDD model
> external USB Seagate
>
>> IIRC there used to be some bug causing csum mismatch, if it's all in one file,
>> you can backup and remove the file, then set nodatacow for that file.
> bugs causing csum mismatch - Uaargh !

Your kernel is not that old AFAIK.

And I don't want to go that path unless there are enough evidence to
indicate that.

Have you figured out which file(s) are affected and what's the workload
of them?

Thanks,
Qu
> How do i set nodatacow ?
>
> Bernd
>
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