Do smart tests even work?

R

Red Squirrel

[H]F Junkie
Joined
Nov 29, 2009
Messages
9,223
All of the failing hitachi's I've been dealing with latetly pass all the smart tests, yet they have tons of errors, lot of dmesg errors, and now one just dropped out of a mdadm array completely. I'm actually rebuilding the array with a drive that is failing because I've run out of drives, but at least that drive did run, it just had like over a million raw read errors.

Shoul'd smart be failing these? I have a feeling I'm going to have a hard time RMAing these because they still run, they just cause lot of errors/issues.

Also, it's only recently that I've been ordering from Newegg. Is it just a coincidence, or is it more common for DOAs from them? I'm going to guess it's just a coincidence, the packaging was half decent.

Another weird thing I noticed is these only seem to start failing once they are in the process of a raid rebuild. Before adding them to the raid I always run all sorts of I/O tests such as formatting it and writing lot of data and reading lot of data and everything works fine. Minute I put it in the raid array, the errors start to go crazy.
 
What errors are you seeing?

What SMART tests did you run?

How are the HDDs connected to your computer? HBA? motherboard? What type of cable? Have you tried swapping with known good cables? If HBA, have you tried swapping with a known-good HBA? If motherboard, have you tried the HDDs on a different motherboard? If a backplane is involved, have you tried with a different backplane?
 
Last edited:
According to a study by Google, 56% of drive failures did not show any significant SMART warnings. This study is a few years old now, so there's a chance that it's improved some, but from my personal experiences I'm doubtful.

Edit: FWIW, I haven't had any issues RMAing drives that don't exhibit SMART errors in the past with any of the major manufacturers. I've always just explained my symptoms, told them SMART wasn't reporting anything, and they'd hand me an RMA number.
 
Last edited:
Ran smartctl -t long

The errors I see are mostly raw read error but also actual warnings in the notification area of the smart output.

Got lot of CRC errors, drive dropped off the map.

Using brand new sata cables (well, at the time the server was built, and they have not been touched since) going to the drive enclosures.

I tried the bad drive in another slot to see if I start getting more errors. The count was at 10. Maybe it is in fact a few bad slots. If that's the case then I guess I can start by trying another cable to that slot, but since the errors are so intermittent it will be a long and tedious task, but if I can at least pin point the problem I'll be happy.

Is there a way to clear the smart data? If it turns out to be an issue outside the drives then I'd like to clear them. This will be a very hard problem to troubleshoot given this is a production server. Could dust in the backplane be an issue? There may be a bit given it's in a dusty basement, but the way I see it, it's either it contacts, or it does not. Not like I'm dealing with tons of amps where a bad connection could cause corrosion or something.

Also when I do a smart test, is it the drive testing itself? So does that bypass any outside issues like cables?
 
High raw read error is normal, on HDDs where it is low or zero they simply do not let you see the actual value. Essentially, this would be the number of unreadable sectors is no ECC was present; or ECC-corrected sectors. Any modern HDD would have extremely high values for this, and the number resets to 0 when it gets too big, so the actual value is alot higher than the raw value.

More interesting are the theshold values, which would show relative raw read errors, but still a very rough measure. It depends per disks how the Raw Read Error Rate is reported. Most newer disks don't let you see the high raw value, probably because people think that means there's something wrong. Perhaps they got fed up getting RMA'ed perfectly fine drives which like any drive has Raw Read Errors.
 
Why is it that some drives get a lot while some don't (all same model)? This is the part that has be stumped.

I did notice that it sometimes resets though.

The last one I'm suspecting may possibly be an outside factor. backplane, cable etc since it originally failed rebuilding, I changed it slot and it just finished rebuilding now. I will have to rebuild using another drive in that slot to confirm.

Code: 
[root@borg done]# smartctl -a /dev/sdb
smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Model Family:     Hitachi Deskstar 7K1000
Device Model:     Hitachi HDS721010KLA330
Serial Number:    GTF002PAK79X2F
Firmware Version: GKAOAB0A
User Capacity:    1,000,204,886,016 bytes
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   7
ATA Standard is:  ATA/ATAPI-7 T13 1532D revision 1
Local Time is:    Thu Feb 10 23:24:33 2011 EST
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:  (0x84)	Offline data collection activity
					was suspended by an interrupting command from host.
					Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: 		 (15354) seconds.
Offline data collection
capabilities: 			 (0x5b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					No 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: 	 (   1) minutes.
Extended self-test routine
recommended polling time: 	 ( 255) minutes.
SCT capabilities: 	       (0x003f)	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     0x000b   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   130   130   054    Pre-fail  Offline      -       150
  3 Spin_Up_Time            0x0007   122   122   024    Pre-fail  Always       -       495 (Average 648)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       42
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   130   130   020    Pre-fail  Offline      -       34
  9 Power_On_Hours          0x0012   098   098   000    Old_age   Always       -       20073
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       42
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       44
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       44
194 Temperature_Celsius     0x0002   176   176   000    Old_age   Always       -       34 (Lifetime Min/Max 16/48)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]


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.

[root@borg done]# 
[root@borg done]# 
[root@borg done]# smartctl -a /dev/sdc
smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Model Family:     Hitachi Deskstar 7K1000
Device Model:     Hitachi HDS721010KLA330
Serial Number:    GTF002PAK7AXUF
Firmware Version: GKAOAB0A
User Capacity:    1,000,204,886,016 bytes
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   7
ATA Standard is:  ATA/ATAPI-7 T13 1532D revision 1
Local Time is:    Thu Feb 10 23:24:38 2011 EST
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:  (0x84)	Offline data collection activity
					was suspended by an interrupting command from host.
					Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: 		 (15354) seconds.
Offline data collection
capabilities: 			 (0x5b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					No 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: 	 (   1) minutes.
Extended self-test routine
recommended polling time: 	 ( 255) minutes.
SCT capabilities: 	       (0x003f)	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     0x000b   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   130   130   054    Pre-fail  Offline      -       150
  3 Spin_Up_Time            0x0007   117   117   024    Pre-fail  Always       -       560 (Average 628)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       43
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   130   130   020    Pre-fail  Offline      -       34
  9 Power_On_Hours          0x0012   098   098   000    Old_age   Always       -       19913
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       43
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       45
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       45
194 Temperature_Celsius     0x0002   171   171   000    Old_age   Always       -       35 (Lifetime Min/Max 16/48)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]


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.

[root@borg done]# 
[root@borg done]# smartctl -a /dev/sdd
smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Model Family:     Hitachi Deskstar 7K1000
Device Model:     Hitachi HDS721010KLA330
Serial Number:    GTH000PAGR2RWH
Firmware Version: GKAOA70M
User Capacity:    1,000,204,886,016 bytes
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   7
ATA Standard is:  ATA/ATAPI-7 T13 1532D revision 1
Local Time is:    Thu Feb 10 23:24:41 2011 EST
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:  (0x84)	Offline data collection activity
					was suspended by an interrupting command from host.
					Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: 		 (15354) seconds.
Offline data collection
capabilities: 			 (0x5b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					No 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: 	 (   1) minutes.
Extended self-test routine
recommended polling time: 	 ( 255) minutes.
SCT capabilities: 	       (0x003f)	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     0x000b   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   130   130   054    Pre-fail  Offline      -       150
  3 Spin_Up_Time            0x0007   119   119   024    Pre-fail  Always       -       509 (Average 664)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       67
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   132   132   020    Pre-fail  Offline      -       33
  9 Power_On_Hours          0x0012   097   097   000    Old_age   Always       -       25945
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       67
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       78
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       78
194 Temperature_Celsius     0x0002   171   171   000    Old_age   Always       -       35 (Lifetime Min/Max 16/47)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]


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.

[root@borg done]# smartctl -a /dev/sde
smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

Smartctl open device: /dev/sde failed: No such file or directory
[root@borg done]# smartctl -a /dev/sdf
smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Device Model:     Hitachi HDS721010CLA332
Serial Number:    JP2940HD032PMC
Firmware Version: JP4OA3EA
User Capacity:    1,000,204,886,016 bytes
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 4
Local Time is:    Thu Feb 10 23:24:47 2011 EST
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:      (   0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: 		 (10517) seconds.
Offline data collection
capabilities: 			 (0x5b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					No 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: 	 (   1) minutes.
Extended self-test routine
recommended polling time: 	 ( 175) minutes.
SCT capabilities: 	       (0x003d)	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     0x000b   100   100   016    Pre-fail  Always       -       65536
  2 Throughput_Performance  0x0005   134   134   054    Pre-fail  Offline      -       101
  3 Spin_Up_Time            0x0007   120   120   024    Pre-fail  Always       -       301 (Average 329)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       23
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   140   140   020    Pre-fail  Offline      -       30
  9 Power_On_Hours          0x0012   100   100   000    Old_age   Always       -       2375
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       21
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       24
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       24
194 Temperature_Celsius     0x0002   253   253   000    Old_age   Always       -       23 (Lifetime Min/Max 18/30)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       1
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       1
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0

SMART Error Log Version: 0
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%      2351         -

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.

[root@borg done]# 
[root@borg done]# 
[root@borg done]# smartctl -a /dev/sdg
smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Device Model:     Hitachi HDS721010CLA332
Serial Number:    JP9921HD3754JH
Firmware Version: JP4OA3MA
User Capacity:    1,000,204,886,016 bytes
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 4
Local Time is:    Thu Feb 10 23:25:00 2011 EST
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:  (0x80)	Offline data collection activity
					was never started.
					Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: 		 (9455) seconds.
Offline data collection
capabilities: 			 (0x5b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					No 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: 	 (   1) minutes.
Extended self-test routine
recommended polling time: 	 ( 158) minutes.
SCT capabilities: 	       (0x003d)	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     0x000b   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   136   136   054    Pre-fail  Offline      -       94
  3 Spin_Up_Time            0x0007   100   100   024    Pre-fail  Always       -       261
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       5
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   138   138   020    Pre-fail  Offline      -       31
  9 Power_On_Hours          0x0012   100   100   000    Old_age   Always       -       102
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       5
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       9
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       9
194 Temperature_Celsius     0x0002   253   253   000    Old_age   Always       -       23 (Lifetime Min/Max 18/27)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       10

SMART Error Log Version: 1
ATA Error Count: 10 (device log contains only the most recent five errors)
	CR = Command Register [HEX]
	FR = Features Register [HEX]
	SC = Sector Count Register [HEX]
	SN = Sector Number Register [HEX]
	CL = Cylinder Low Register [HEX]
	CH = Cylinder High Register [HEX]
	DH = Device/Head Register [HEX]
	DC = Device Command Register [HEX]
	ER = Error register [HEX]
	ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.

Error 10 occurred at disk power-on lifetime: 96 hours (4 days + 0 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  84 51 d0 30 ba 6b 02

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  61 00 c0 00 5a 6b 40 00  24d+15:35:25.222  WRITE FPDMA QUEUED
  61 00 b8 00 5e 6b 40 00  24d+15:35:25.221  WRITE FPDMA QUEUED
  61 00 b0 00 62 6b 40 00  24d+15:35:25.221  WRITE FPDMA QUEUED
  61 00 a8 00 66 6b 40 00  24d+15:35:25.221  WRITE FPDMA QUEUED
  61 00 a0 00 6a 6b 40 00  24d+15:35:25.221  WRITE FPDMA QUEUED

Error 9 occurred at disk power-on lifetime: 96 hours (4 days + 0 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  84 51 b0 50 56 6b 02

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  61 00 c8 00 ba 6b 40 00  24d+15:35:11.906  WRITE FPDMA QUEUED
  61 00 c0 00 b6 6b 40 00  24d+15:35:11.906  WRITE FPDMA QUEUED
  61 00 b8 00 b2 6b 40 00  24d+15:35:11.906  WRITE FPDMA QUEUED
  61 00 b0 00 ae 6b 40 00  24d+15:35:11.906  WRITE FPDMA QUEUED
  61 00 a8 00 aa 6b 40 00  24d+15:35:11.906  WRITE FPDMA QUEUED

Error 8 occurred at disk power-on lifetime: 96 hours (4 days + 0 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  84 51 60 a0 ba 6b 02

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  61 00 c8 00 56 6b 40 00  24d+15:34:58.632  WRITE FPDMA QUEUED
  61 00 c0 00 5a 6b 40 00  24d+15:34:58.632  WRITE FPDMA QUEUED
  61 00 b8 00 5e 6b 40 00  24d+15:34:58.632  WRITE FPDMA QUEUED
  61 00 b0 00 62 6b 40 00  24d+15:34:58.632  WRITE FPDMA QUEUED
  61 00 a8 00 66 6b 40 00  24d+15:34:58.632  WRITE FPDMA QUEUED

Error 7 occurred at disk power-on lifetime: 96 hours (4 days + 0 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  84 51 b0 50 56 6b 02

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  61 00 c8 00 ba 6b 40 00  24d+15:34:45.191  WRITE FPDMA QUEUED
  61 00 c0 00 b6 6b 40 00  24d+15:34:45.190  WRITE FPDMA QUEUED
  61 00 b8 00 b2 6b 40 00  24d+15:34:45.190  WRITE FPDMA QUEUED
  61 00 b0 00 ae 6b 40 00  24d+15:34:45.190  WRITE FPDMA QUEUED
  61 00 a8 00 aa 6b 40 00  24d+15:34:45.190  WRITE FPDMA QUEUED

Error 6 occurred at disk power-on lifetime: 96 hours (4 days + 0 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  84 51 c0 40 ba 6b 02

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  61 00 c8 00 56 6b 40 00  24d+15:34:32.070  WRITE FPDMA QUEUED
  61 00 c0 00 5a 6b 40 00  24d+15:34:32.069  WRITE FPDMA QUEUED
  61 00 b8 00 5e 6b 40 00  24d+15:34:32.069  WRITE FPDMA QUEUED
  61 00 b0 00 62 6b 40 00  24d+15:34:32.069  WRITE FPDMA QUEUED
  61 00 a8 00 66 6b 40 00  24d+15:34:32.069  WRITE FPDMA QUEUED

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%        77         -

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.

[root@borg done]#
 
The Raw Read Error Rate is not a problem; if the ECC correction did not succeed at recovering the entire sector, you would have seen Current Pending Sector (real dangerous unreadable sector count) instead.

Not sure why some drives show 0 and the other shows a value, but not all your Hitachi drives are equal and it can depend on the firmware they sport.
 
EvanH said:
According to a study by Google, 56% of drive failures did not show any significant SMART warnings. This study is a few years old now, so there's a chance that it's improved some, but from my personal experiences I'm doubtful.
Click to expand...

This. They had a very large sample size of various manufacturers and while SMART points out some obvious things it just doesn't catch everything.
 
I don't see SMART as prefail warning, but rather as diagnosing tool when you are encountering problems and want to rule out disk error. It's great for catching cable errors, bad sector status and other stuff.
 
S.M.A.R.T. (personal opinion here based on entirely too long working with these damned machines) is a nice idea in principle but pretty shitty implementation of the idea in the long run. I've yet to actually find any use for the concept at all, and I've got a shoebox here with drives that have near-perfect S.M.A.R.T. "status" while every single one of them fails the manufacturer's diagnostics - 4 different brands of drives, and they were cross-tested using various tools that all confirm they're bad drives.

S.M.A.R.T. just whistles right along proclaiming no errors whatsoever on every single of 'em.

I find it useless, to put it bluntly.
 
How would you know you have cable errors, without SMART?
How would you know your HDD has pending unreadable sectors, which was the prime reason for your fakeRAID to fail like hundreds of thousands of people have already experienced?
How would you know at what rate your HDD is developing bad sectors?
How would you know whether corruption of your SSD is caused by unclean shutdowns?

SMART is useful for this. If you expect SMART to tell you "this drive is going to die in 3 months" then you had unrealistic expectations to begin with.
 
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