Which file occupies a given sector of a drive that's part of a RAID array?

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flyingrhino
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Which file occupies a given sector of a drive that's part of a RAID array?

Post by flyingrhino » Tue Apr 03, 2018 10:07 pm

Hi,

I am getting SMART warnings about bad sectors on one of my drives.
The drive is one of four in a RAID 5 array.
I know the sector number of the drive that is faulty.

Is there any simple way (program, command line tool, etc) that can tell me the name of the file that occupies that sector? Ideally I want to enter the sector number and the software tells me the file name that lives there.

I think it's not simple to accomplish manually from the command line because there is a layer of abstraction between the drive and the file system that is created by the RAID.

Thanks.

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Pierre
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Re: Which file occupies a given sector of a drive that's part of a RAID array?

Post by Pierre » Tue Apr 03, 2018 10:36 pm

as far as I'm aware, there is no program, as such, that could state what Data is at any given location on a HDD.

I've done something like that, in the distant past, where an program could interpret the Data in Hex format,
and display that in byte by byte information of the screen, but I've not seen anything similar in recent years.
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catweazel
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Re: Which file occupies a given sector of a drive that's part of a RAID array?

Post by catweazel » Tue Apr 03, 2018 10:50 pm

flyingrhino wrote:
Tue Apr 03, 2018 10:07 pm
Is there any simple way (program, command line tool, etc) that can tell me the name of the file that occupies that sector?
Identify damaged files.
¡uʍop ǝpısdn sı buıɥʇʎɹǝʌǝ os ɐıןɐɹʇsnɐ ɯoɹɟ ɯ,ı

flyingrhino
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Re: Which file occupies a given sector of a drive that's part of a RAID array?

Post by flyingrhino » Wed Apr 04, 2018 1:40 am

Thanks guys for the quick answers.
Identify damaged files.
That's exactly what I was looking for.

However, now I have a different problem - LM removed the defective device from the array. In 'disks' program I see state = Array is degraded - 1 disk is missing. It wasn't the case earlier - all 4 disks were there but one was giving SMART errors.

Anyway, I try debugfs and it gives this error:

Code: Select all

pc 2018-04-04 16:06:06 ~/ # debugfs /dev/sdf
debugfs 1.42.9 (4-Feb-2014)
/dev/sdf: Bad magic number in super-block while opening filesystem
debugfs:  
Any idea where the bad magic number comes from? Is it because the disk is no longer part of the array and the block tables don't make sense any more?

Here's the output from SMART short test:

Code: Select all

smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.16.0-38-generic] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     WDC WD40EZRZ-00WN9B0
Serial Number:    WD-WCC4E7LH3442
LU WWN Device Id: 5 0014ee 20cd52c9f
Firmware Version: 80.00A80
User Capacity:    4,000,787,030,016 bytes [4.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Apr  4 16:00:32 2018 NZST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x82)	Offline data collection activity
					was completed without error.
					Auto Offline Data Collection: Enabled.
Self-test execution status:      ( 121)	The previous self-test completed having
					the read element of the test failed.
Total time to complete Offline 
data collection: 		(55080) seconds.
Offline data collection
capabilities: 			 (0x7b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					Conveyance Self-test supported.
					Selective Self-test supported.
SMART capabilities:            (0x0003)	Saves SMART data before entering
					power-saving mode.
					Supports SMART auto save timer.
Error logging capability:        (0x01)	Error logging supported.
					General Purpose Logging supported.
Short self-test routine 
recommended polling time: 	 (   2) minutes.
Extended self-test routine
recommended polling time: 	 ( 551) minutes.
Conveyance self-test routine
recommended polling time: 	 (   5) minutes.
SCT capabilities: 	       (0x7035)	SCT Status supported.
					SCT Feature Control supported.
					SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   181   177   021    Pre-fail  Always       -       7950
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       213
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   099   099   000    Old_age   Always       -       797
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       213
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       0
193 Load_Cycle_Count        0x0032   199   199   000    Old_age   Always       -       3393
194 Temperature_Celsius     0x0022   115   110   000    Old_age   Always       -       37
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       2
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       2
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       2

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed: read failure       90%       797         2561854352
# 2  Short offline       Completed: read failure       90%       780         2561854352
# 3  Extended offline    Completed: read failure       90%       780         2561854352
# 4  Short offline       Completed: read failure       90%       780         2561854352
# 5  Extended offline    Completed: read failure       90%       779         2561854352
# 6  Extended offline    Completed: read failure       90%       779         2561854352
# 7  Short offline       Completed: read failure       90%       779         2561854352

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
Right now I am copying the data from the array to a bunch of smaller drives I have. No data loss which is good :)
It will probably take a day at USB3 speed, but that's ok.
At least when this is done I can try to recover the RAID with no fear of losing data if I screw up...

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