On 11/2/26 12:17, bob prohaska wrote:
> A few more tests were tried on the offending hard disk, with mixed
> results. Then the disk was re-connected and booted up. The root
> partition came up clean, but the /usr partition would not, failing
> fsck repeatedly even after reporting "filesystem is clean".
>
> Finally I gave up and ran diskroaster, which reported five errors.
> Then I tried dd, sending output to /dev/null. That reported success.
>
> Eventually I stumbled on the correct incantation of smartctl, which
> didn't report any obvious faults. In particular "current pending
> sectors", which I understand to be indicative of problems, was zero.
>
> The results of diskroaster, dd and smartctl are in
> http://www.zefox.net/~fbsd/rpi2/disktrouble/
> if anybody's willing to have a look. At this point
> dd and smartctl seem to see nothing wrong, diskroaster
> reports five errors but the last has an extra byte in
> the block offset, which seems odd. Also, the runtime
> values given were wildly off, two hours turned into
> all day and into the night.
>
> At this point
> smartctl -t long /dev/da1 is running. Any guidance in
> what to look for would be much appreciated. It'll finish
> in about three hours' from this writing.
>
> Thanks for reading,
>
> bob prohaska
>
>
>
I copied and dropped the following text into a google search AI that I
started with just a smartctl search:
QUOTE
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 083 056 006 Pre-fail Always
- 196488624
3 Spin_Up_Time 0x0003 099 099 000 Pre-fail Always
- 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always
- 928
5 Reallocated_Sector_Ct 0x0033 099 099 036 Pre-fail Always
- 386
7 Seek_Error_Rate 0x000f 088 060 045 Pre-fail Always
- 689807869
9 Power_On_Hours 0x0032 069 069 000 Old_age Always
- 27803 (180 183 0)
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always
- 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always
- 466
184 End-to-End_Error 0x0032 100 100 099 Old_age Always
- 0
187 Reported_Uncorrect 0x0032 095 095 000 Old_age Always
- 5
188 Command_Timeout 0x0032 100 093 000 Old_age Always
- 12885098515
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always
- 0
190 Airflow_Temperature_Cel 0x0022 077 049 040 Old_age Always
- 23 (Min/Max 23/43)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always
- 11
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always
- 106
193 Load_Cycle_Count 0x0032 001 001 000 Old_age Always
- 1114296
194 Temperature_Celsius 0x0022 023 051 000 Old_age Always
- 23 (0 16 0 0 0)
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 - 22728 (60 98 0)
241 Total_LBAs_Written 0x0000 100 253 000 Old_age
Offline - 23880627479
242 Total_LBAs_Read 0x0000 100 253 000 Old_age
Offline - 41354991467
254 Free_Fall_Sensor 0x0032 100 100 000 Old_age Always
- 0
END QUOTE
Its reply included:
QUOTE
Your hard drive is failing and should be replaced as soon as possible.
While the "pass/fail" status might technically show a pass because no
individual attribute has crossed its threshold yet, the drive has
physically degraded and is actively damaging your data.
Critical Concerns
• ID 5: Reallocated_Sector_Ct (Raw Value: 386) – This is the most
damning metric. The drive has found 386 bad sectors and has moved data
out of them to a backup area. This means the magnetic platters are
physically deteriorating.
• ID 187: Reported_Uncorrect (Raw Value: 5) – The drive encountered 5
read errors that its internal error correction code (ECC) could not fix.
These are permanent data corruptions.
• ID 193: Load_Cycle_Count (Raw Value: 1,114,296) – The drive's
read/write heads have parked and unparked over 1.1 million times.
Mechanical drives are typically rated for around 300,000 to 600,000
cycles. Your drive is at 1 (worst possible normalized value), meaning it
has vastly outlived its mechanical design limits.
Less Critical (Seagate Specifics)
• ID 1 & 7: Raw_Read_Error_Rate & Seek_Error_Rate – The raw values look
huge (196M and 689M), but this is actually normal for Seagate drives.
Seagate packs multiple metrics (like total operations vs. actual errors)
into these raw numbers. The normalized VALUE columns (83 and 88) are
well above their THRESH safety lines (6 and 45), meaning these aren't
your primary issues.
Summary of Drive State
Your drive has been running for 27,803 hours (about 3.1 years of
continuous operation). It is a heavily used drive that is reaching the
end of its mechanical lifespan and has started dropping sectors.
END QUOTE
--
===
Mark Millard
marklmi at yahoo.com
