Ok - no answer here so I'll try to document my own progress here. The closest I could find to what I was looking for was
here - a post by
Joshua Parker Ruehlig of sickbeard/sabnzbd/... fame.
So I ran
Code:
smartctl -t long /dev/ada0 |more
whereby the 0 of ada# refers to the drive that was reported to have problems
Here's what that resulted in (and I'll truncate, as there is a 30'000 character-limit on these messages)
Code:
smartctl 6.1 2013-03-16 r3800 [FreeBSD 9.1-STABLE amd64] (local build)
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
See vendor-specific Attribute list for marginal Attributes.
General SMART Values:
Offline data collection status: (0x82) Offline data collection activity
was completed without error.
Auto Offline Data Collection: Enabled.
Self-test execution status: ( 121) The previous self-test completed having
the read element of the test failed.
Total time to complete Offline
data collection: ( 575) 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: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 328) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x3085) SCT Status supported.
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 074 074 006 Pre-fail Always - 188712502
3 Spin_Up_Time 0x0003 095 093 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 60
5 Reallocated_Sector_Ct 0x0033 053 051 036 Pre-fail Always - 62208
7 Seek_Error_Rate 0x000f 079 060 030 Pre-fail Always - 86134410
9 Power_On_Hours 0x0032 088 088 000 Old_age Always - 10750
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 60
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 001 001 000 Old_age Always - 6705
188 Command_Timeout 0x0032 100 078 000 Old_age Always - 110 110 139
189 High_Fly_Writes 0x003a 077 077 000 Old_age Always - 23
190 Airflow_Temperature_Cel 0x0022 047 038 045 Old_age Always In_the_past 53 (3 94 57 51 0)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 48
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 1998
194 Temperature_Celsius 0x0022 053 062 000 Old_age Always - 53 (0 19 0 0 0)
197 Current_Pending_Sector 0x0012 084 081 000 Old_age Always - 2688
198 Offline_Uncorrectable 0x0010 084 081 000 Old_age Offline - 2688
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 3
240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 10461h+52m+14.943s
241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 167398434356543
242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 67043716510972
SMART Error Log Version: 1
ATA Error Count: 6047 (device log contains only the most recent five errors)
CR = Command Register [HEX]
FR = Features Register [HEX]
SC = Sector Count Register [HEX]
SN = Sector Number Register [HEX]
CL = Cylinder Low Register [HEX]
CH = Cylinder High Register [HEX]
DH = Device/Head Register [HEX]
DC = Device Command Register [HEX]
ER = Error register [HEX]
ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.
Error 6047 occurred at disk power-on lifetime: 10748 hours (447 days + 20 hours)
When the command that caused the error occurred, the device was active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 48 ff ff ff 4f 00 16d+02:40:24.199 READ FPDMA QUEUED
2f 00 01 10 00 00 00 00 16d+02:40:24.165 READ LOG EXT
60 00 48 ff ff ff 4f 00 16d+02:40:21.558 READ FPDMA QUEUED
2f 00 01 10 00 00 00 00 16d+02:40:21.456 READ LOG EXT
60 00 48 ff ff ff 4f 00 16d+02:40:18.823 READ FPDMA QUEUED
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed: read failure 90% 10749 -
# 2 Short offline Completed without error 00% 110 -
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.
The scariest bit here is the line that says "ATA Error Count: 6047". I presume that means there are 6047 errors on the drive. So I guess I'll probably have to replace it. I had seen errors appear before, but I figured that the drive was only a bit older than a year, so it couldn't possibly be a big deal. Also since zfs is supposed to be so smart, I thought that'd probably fix the errors (i.e. move 'bad' sectors to 'good' ones) without me having to worry about it.
So I am now struggling with the next instruction, which says to check the smart information for the unreadable sector, but which does not say where to find this.
If anybody has any suggestions as I do through this (OR can still point me to the troubleshooting guide I was hoping would exist), I'd be more grateful. I'll keep updating this post as I make progress. IF I make progress :)
