[mythtv-users] mythbackend hanging with busy disk
Håkon Alstadheim
hakon at alstadheim.priv.no
Sat Apr 9 13:41:33 UTC 2016
Den 09. april 2016 15:05, skrev Jeffrey Ratcliffe:
> On 8 April 2016 at 22:00, Will Dormann <wdormann at gmail.com> wrote:
>> The SMART global results are worthless. It'll almost always say
>> "PASSED". Please post the entire results of smartctl -a
>
> $ sudo smartctl -a /dev/sda
> smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-85-generic] (local build)
> Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
>
> === START OF INFORMATION SECTION ===
> Model Family: Western Digital Caviar Green (AF, SATA 6Gb/s)
> Device Model: WDC WD20EARX-00PASB0
> Serial Number: WD-WCAZAJ682312
> LU WWN Device Id: 5 0014ee 207994c3b
> Firmware Version: 51.0AB51
> User Capacity: 2,000,398,934,016 bytes [2.00 TB]
> Sector Sizes: 512 bytes logical, 4096 bytes physical
> 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: Sat Apr 9 15:04:14 2016 CEST
> 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: (39900) 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: ( 2) minutes.
> Extended self-test routine
> recommended polling time: ( 384) minutes.
> Conveyance self-test routine
> recommended polling time: ( 5) minutes.
> SCT capabilities: (0x3035) 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 0x002f 200 200 051 Pre-fail
> Always - 0
> 3 Spin_Up_Time 0x0027 175 171 021 Pre-fail
> Always - 6250
> 4 Start_Stop_Count 0x0032 096 096 000 Old_age
> Always - 4872
> 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail
> Always - 0
> 7 Seek_Error_Rate 0x002e 200 200 000 Old_age
> Always - 0
> 9 Power_On_Hours 0x0032 091 091 000 Old_age
> Always - 7145
> 10 Spin_Retry_Count 0x0032 100 100 000 Old_age
> Always - 0
> 11 Calibration_Retry_Count 0x0032 100 100 000 Old_age
> Always - 0
> 12 Power_Cycle_Count 0x0032 096 096 000 Old_age
> Always - 4872
> 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age
> Always - 47
> 193 Load_Cycle_Count 0x0032 114 114 000 Old_age
> Always - 258165
> 194 Temperature_Celsius 0x0022 118 107 000 Old_age
> Always - 32
> 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age
> Always - 0
> 197 Current_Pending_Sector 0x0032 200 200 000 Old_age
> Always - 0
> 198 Offline_Uncorrectable 0x0030 200 200 000 Old_age
> Offline - 0
> 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age
> Always - 0
> 200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age
> Offline - 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.
>
I notice it is a "green" drive. At least until your issues are fixed,
you might look into how to make the drive NOT go to sleep. I had a green
drive once that gave me some of grief as a mythtv storage drive,
recordings would fail because the drive did not wake up fast enough.
I'd say the smart output looks good, except that no self-test has run to
completion. Try running extended self test while not using the drive for
anything. You have to leave it for 11 hours and 5 minutes (that is
39900 seconds). If the drive is in use, the time for the test is a lot
longer. If not using the drive and/or keeping the machine running is
impossible, look into running successive selective self-tests until the
whole drive has been tested.
Side-note: I have a couple of seagate nas drives that seem incapable of
completing the extended self-test. Turns out to be a known issue. Never
heard of that for WD though.
If your data is not life-or-death you could look into making the drive
error out early (rather than re-trying for a long time) on reads that
fail. Something like smartctl -l scterc,70,70 . This setting is normally
only used for raid members.
If you have an almost-but-not-completely failing read somewhere on the
drive, no sectors will be marked bad until you WRITE to the failing
sector, or until a self-test reaches that sector. Even if you have
sectors marked bad those sectors will not be re-mapped until you write
to that sector.
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