nibbana at gmx.us
Sat Mar 28 05:04:19 UTC 2015
Regarding the unexpected loss of files from the filesystem under various
loads, is the appended 'smartctl' data sufficient to make the determination
that the loss of files while the operating system is in use could be due to
the condition of the drive?
I didn't think so at first, because:
1) I would expect a FreeBSD error to the effect of "unable to read/write
/dev/ada0" or "block checksum does not match block data".
2) I would expect that all data read/written to from a drive is verfied to be
correct by FreeBSD with checksums, and that it is guaranteed to be correct
if there are no serious and fatal errors reported by the operating system.
But I may be wrong in these assumptions. Anybody know for sure? I have never
seen FreeBSD report any filesystem r/w errors. My past experience has only
taught me that when a drive begins to make very bad noises, this generally
accompanies obvious and serious problems; and that a drive fails when the
mechanical parts fail, but not due to wear on heads/platters or other things
that may cause failures that are not detected/reported by the operating
I can't see how the loss of files could occur without FreeBSD noticing it and
reporting on it. Does FreeBSD just trust drives to do everything correctly
at all times?
smartctl 6.2 2014-02-18 r3874 [FreeBSD 9.2-RELEASE i386] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Caviar WDxxxAB
Device Model: WDC WD400AB-22CDB0
Serial Number: WD-WMA9T1222658
Firmware Version: 22.04A22
User Capacity: 40,020,664,320 bytes [40.0 GB]
Sector Size: 512 bytes logical/physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA/ATAPI-5 (minor revision not indicated)
Local Time is: Fri Mar 27 20:35:32 2015 AKDT
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
Total time to complete Offline
data collection: ( 2376) seconds.
Offline data collection
capabilities: (0x3b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
Offline surface scan supported.
Conveyance Self-test supported.
No Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
No General Purpose Logging support.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 42) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
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 200 200 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0007 102 099 021 Pre-fail Always - 3975
4 Start_Stop_Count 0x0032 100 100 040 Old_age Always - 58
5 Reallocated_Sector_Ct 0x0033 199 199 140 Pre-fail Always - 1
7 Seek_Error_Rate 0x000b 200 200 051 Pre-fail Always - 0
9 Power_On_Hours 0x0032 083 083 000 Old_age Always - 12540
10 Spin_Retry_Count 0x0013 100 253 051 Pre-fail Always - 0
11 Calibration_Retry_Count 0x0013 100 253 051 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 57
196 Reallocated_Event_Count 0x0032 199 199 000 Old_age Always - 1
197 Current_Pending_Sector 0x0012 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0012 200 200 000 Old_age Always - 0
199 UDMA_CRC_Error_Count 0x000a 200 253 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0009 200 200 051 Pre-fail 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]
Selective Self-tests/Logging not supported
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