On Tue, Oct 16, 2018 at 6:09 PM Paul Robert Marino <[log in to unmask]> wrote:
>
> to be clear I wasn't saying Smart is useless just that smartctl doesn't always tell you every thing so you shouldn't rely as a definitive answer on all issues on all disks.
>
> As for raid controllers well that's a very long conversation there are good reasons the enterprise ones do not, at least not directly in a way you can extract using the smartctl command instead they have more advanced checks available through the drivers and additional monitoring tools provided by the manufacturer of the raid controller.
>
> as for the predictive nature of smart well that's actually in its specification it predicts errors based on indicators.
>
> On Tue, Oct 16, 2018 at 7:55 PM Konstantin Olchanski <[log in to unmask]> wrote:
>>
>> On Tue, Oct 16, 2018 at 04:20:03PM -0400, Paul Robert Marino wrote:
>> >
>> > smart is predictive and doesn't catch all errors its also not compatible
>> > with all disks and controllers especially raid capable controllers.
>> >
>>
>>
>> Do not reject SMART as useless, it correctly reports many actual disk failures:
>>
>> a) overheating (actual disk temperature is reported in degrees Centigrade)
>> b) unreadable sectors (data on these sectors is already lost) - disk model dependant
>> c) "hard to read" sectors (WD specific - "raw read error rate")
>> d) sata link communication errors ("CRC error count")
>>
>> even more useful actual (*not* predictive) stuff is reported for SSDs (again, model dependant)
>>
>> it is true that much of this information is disk model dependant and
>> one has to have some experience with the SMART data to be able
>> to read it in a meaningful way.
>>
>> as for raid controllers that prevent access to disk SMART data,
>> they are as safe to use a car with a blank dashboard (no fuel level,
>> no engine temperature, no speedometer, etc).
>>
Posting " smartctl -a" output below.
Also just wanted to mention that I have only single disk on my
machine. So the disk has not failed. I was able to restart the machine
lot of times and the OS came up nice.
# smartctl -a /dev/sda
smartctl 6.2 2017-02-27 r4394
[x86_64-linux-3.10.0-862.14.4.el7.x86_64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, https://urldefense.proofpoint.com/v2/url?u=http-3A__www.smartmontools.org&d=DwIFaQ&c=gRgGjJ3BkIsb5y6s49QqsA&r=gd8BzeSQcySVxr0gDWSEbN-P-pgDXkdyCtaMqdCgPPdW1cyL5RIpaIYrCn8C5x2A&m=HVdbO_Zor-zyG5wjg1a513ELmsH-s6kV9BOATEv8HT4&s=0RkyV6zeuis8j3X9vh4DjMK3wxnckgIh-soHjAWzJGo&e=
=== START OF INFORMATION SECTION ===
Model Family: Toshiba 3.5" MG03ACAxxx(Y) Enterprise HDD
Device Model: TOSHIBA MG03ACA100
Serial Number: 46SIKCQFF
LU WWN Device Id: 5 000039 6fbf81f8b
Add. Product Id: DELL(tm)
Firmware Version: FL2H
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
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 (minor revision not indicated)
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Tue Oct 16 20:17:41 2018 PDT
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
Warning: This result is based on an Attribute check.
General SMART Values:
Offline data collection status: (0x85) Offline data collection activity
was aborted 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: ( 90) 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: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 164) minutes.
SCT capabilities: (0x003d) SCT Status supported.
SCT Error Recovery Control 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 100 100 050 Pre-fail
Always - 0
2 Throughput_Performance 0x0004 100 100 000 Old_age
Offline - 0
3 Spin_Up_Time 0x0027 100 100 001 Pre-fail
Always - 4211
4 Start_Stop_Count 0x0032 100 100 000 Old_age
Always - 26
5 Reallocated_Sector_Ct 0x0033 100 100 050 Pre-fail
Always - 0
7 Seek_Error_Rate 0x000a 100 100 000 Old_age
Always - 0
8 Seek_Time_Performance 0x0004 100 100 000 Old_age
Offline - 0
9 Power_On_Hours 0x0032 051 051 000 Old_age
Always - 19725
10 Spin_Retry_Count 0x0032 100 100 000 Old_age
Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age
Always - 26
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age
Always - 25
193 Load_Cycle_Count 0x0032 100 100 000 Old_age
Always - 26
194 Temperature_Celsius 0x0022 100 100 000 Old_age
Always - 32 (Min/Max 20/37)
196 Reallocated_Event_Count 0x0032 100 100 000 Old_age
Always - 0
198 Offline_Uncorrectable 0x0030 100 100 000 Old_age
Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age
Always - 0
241 Total_LBAs_Written 0x0032 100 100 000 Old_age
Always - 2347506755
242 Total_LBAs_Read 0x0032 100 100 000 Old_age
Always - 125819370
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 without error 00% 19240 -
# 2 Extended offline Completed without error 00% 17252 -
# 3 Short offline Completed without error 00% 17248 -
# 4 Short offline Completed without error 00% 2 -
# 5 Vendor (0xdf) Completed without error 00% 2 -
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.
#
>>
>> --
>> Konstantin Olchanski
>> Data Acquisition Systems: The Bytes Must Flow!
>> Email: olchansk-at-triumf-dot-ca
>> Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada
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