On Tue, Oct 16, 2018 at 8:20 PM Radha Mohan <[log in to unmask]> wrote:
>
> 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=kQ8vvayrVpln1ARGxS9sNz5F4E2AypuC4yVAsVT_nO4&s=994EuiJp86AYjKROB14_SvOCF1tiERWKXFElbEjMDvo&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.
> #
>
> >>
After digging around the internet for more I found one more command
"# smartctl -r ioctl,2 -q noserial -d sat -H /dev/sda"
This gave a very long output but at the end gave this:
=== START OF READ SMART DATA SECTION ===
REPORT-IOCTL: Device=/dev/sda Command=SMART STATUS CHECK
Input: FR=0xda, SC=...., LL=...., LM=0x4f, LH=0xc2, DEV=....,
CMD=0xb0
[ata pass-through(16): 85 06 2c 00 da 00 00 00 00 00 4f 00 c2 00 b0
00 ]
scsi_status=0x0, host_status=0x4, driver_status=0x0
info=0x1 duration=23 milliseconds resid=0
sat_device::ata_pass_through: scsi_pass_through() failed, errno=5
[Input/output error]
[Duration: 0.023s]
REPORT-IOCTL: Device=/dev/sda Command=SMART STATUS CHECK returned -1
errno=5 [Input/output error]
SMART overall-health self-assessment test result: PASSED
Warning: This result is based on an Attribute check.
-------------------------
Based on above and discussion at
https://urldefense.proofpoint.com/v2/url?u=https-3A__sourceforge.net_p_smartmontools_mailman_message_31516819_&d=DwIFaQ&c=gRgGjJ3BkIsb5y6s49QqsA&r=gd8BzeSQcySVxr0gDWSEbN-P-pgDXkdyCtaMqdCgPPdW1cyL5RIpaIYrCn8C5x2A&m=kQ8vvayrVpln1ARGxS9sNz5F4E2AypuC4yVAsVT_nO4&s=Wehwe-jGCdLk6vKXPB0_Li2KnkcYiIKLvkmPSutdYqs&e= I
came to conclusion that disk isn't bad at all.
It's just that the certain ATA passthrough command doesn't pass
because either the controller or something doesn't support it.
A failure that can be ignored :)
- RM
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