Dotaz: Může dojít k přetečení SMART atributu?

[paul2no]

Dostal se mi do ruky pevný disk, dost starý, vyrobený v listopadu 2009. Disk má 10 realokovaných sektorů, nicméně potrápil jsem ho pomocí badblocks, i pomocí SMART long testu, a vše prošlo. Nicméně co mi přijde hodně divné je SMART hodnota Power_On_Hours, která je 1686 (a přiskakuje po hodině), což je naprostý nesmysl. Pak je tu ještě Head_Flying_Hours, která je 87220, a to už vypadá reálně. Ten disk byl v počítači, který se téměř nevypínal. Jak je tohle možné? Nevypadá to, že by disk byl tak v háji, že by nezvládl ani reportovat SMART správně. Je možné aby SMART čítač přetekl? A proč případně přetekl jen jeden? Jsem zmaten.

smartctl 7.1 2019-12-30 r5022 [x86_64-linux-5.4.0-33-generic] (local build)
Copyright (C) 2002-19, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda 7200.12
Device Model:     ST3320418AS
Serial Number:    6VM90RL0
LU WWN Device Id: 5 000c50 01ec9347f
Firmware Version: CC66
User Capacity:    320 072 933 376 bytes [320 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    7200 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 2.6, 3.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Tue Jun 16 20:04:58 2020 CEST

==> WARNING: A firmware update for this drive may be available,
see the following Seagate web pages:
http://knowledge.seagate.com/articles/en_US/FAQ/207931en
http://knowledge.seagate.com/articles/en_US/FAQ/213891en

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: 		(  617) 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: 	 (   1) minutes.
Extended self-test routine
recommended polling time: 	 (  66) minutes.
Conveyance self-test routine
recommended polling time: 	 (   2) minutes.
SCT capabilities: 	       (0x103f)	SCT Status supported.
					SCT Error Recovery Control supported.
					SCT Feature Control supported.
					SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   114   099   006    Pre-fail  Always       -       66240943
  3 Spin_Up_Time            0x0003   097   097   000    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0032   094   094   020    Old_age   Always       -       6426
  5 Reallocated_Sector_Ct   0x0033   100   100   036    Pre-fail  Always       -       10
  7 Seek_Error_Rate         0x000f   072   060   030    Pre-fail  Always       -       64691690933
  9 Power_On_Hours          0x0032   099   011   000    Old_age   Always       -       1686
 10 Spin_Retry_Count        0x0013   100   100   097    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   098   098   020    Old_age   Always       -       2714
183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       -       0
184 End-to-End_Error        0x0032   100   100   099    Old_age   Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   095   000    Old_age   Always       -       27
189 High_Fly_Writes         0x003a   099   099   000    Old_age   Always       -       1
190 Airflow_Temperature_Cel 0x0022   059   049   045    Old_age   Always       -       39 (Min/Max 34/41)
194 Temperature_Celsius     0x0022   041   051   000    Old_age   Always       -       39 (0 17 0 0 0)
195 Hardware_ECC_Recovered  0x001a   063   044   000    Old_age   Always       -       66240943
197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0010   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       -       0
240 Head_Flying_Hours       0x0000   100   253   000    Old_age   Offline      -       87220 (169 167 0)
241 Total_LBAs_Written      0x0000   100   253   000    Old_age   Offline      -       1272982527
242 Total_LBAs_Read         0x0000   100   253   000    Old_age   Offline      -       601460270

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  Extended offline    Completed without error       00%      1686         -
# 2  Vendor (0x50)       Completed without error       00%         0         -

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.

Odpovědi

[R]

Ano, je to mozne. Mnohe starsie disky s tym problem nemaju - ale pri Seagate ma uz nic neprekvapi. Videl som uz aj podtecenie, ked hodnota Current_Pending_Sector bola 0 a pritom tam jeden necitatelny sektor bol. Po jeho prepisani (opraveni) "klesla" hodnota z 0 asi na 2 miliardy...

[Pavel 'TIGER' Růžička]

A nemůže to prostě být jen tím, že deska s tou hodnotou prostě pracovala špatně? Já osobně beru smart jen jako orientační pomůcku o stavu disku. Někdy stačí špatný kabel a hodnoty začnou haprovat.