[smartmontools-support] lots of pending sectors appear and disappear

[Brice Goglin]

Hello

On a new SSD from French vendor "LDLC", smart often sends an error
message at boot saying
"Device: /dev/sda [SAT], 262144 Currently unreadable (pending) sectors"
The number of pending sectors has been either 262144, 524288 or 786432.
Sometimes, it goes back to 0 for several days. And later it goes back up
for no obvious reason.

Smart reports 0 reallocated sectors (full output below). Smart short and
long tests report no problem. dmesg shows no problem. badblocks reports
no problem (only tested on the partition that covers 75% of the disk).

Reading the documentation, I feel like these sectors are "temporarily"
unaccessible and come back to life later? That's quite disturbing since
262144 sectors is quite a lot. Any idea how to debug this further? Is
there anything useful in the full smartctl output below?

The vendor wants me to run HD Tune Pro but obviously I don't even have
Windows and I am not even sure it would be more useful than smartctl...

Regards
Brice Goglin


smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.5.0-2-amd64] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke,
http://www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model: LDLC
Serial Number: SZHYPO16010606F0146
Firmware Version: O1026A
User Capacity: 120 034 123 776 bytes [120 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: Solid State Device
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: ACS-2 (minor revision not indicated)
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Sat Jul 9 21:40:03 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: (0x02) Offline data collection activity
was completed without error.
Auto Offline Data Collection: Disabled.
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: ( 57) seconds.
Offline data collection
capabilities: (0x71) SMART execute Offline immediate.
No Auto Offline data collection support.
Suspend Offline collection upon new
command.
No Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0002) Does not save 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: ( 1) minutes.
Conveyance self-test routine
recommended polling time: ( 1) 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: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH
TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x0000 100 100 000 Old_age
Offline - 0
5 Reallocated_Sector_Ct 0x0000 100 100 000 Old_age
Offline - 0
9 Power_On_Hours 0x0000 100 100 000 Old_age
Offline - 1803
12 Power_Cycle_Count 0x0000 100 100 000 Old_age
Offline - 28
160 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 0
161 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 99
163 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 39
164 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 9510
165 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 27
166 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 0
167 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 9
168 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 3000
169 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 100
175 Program_Fail_Count_Chip 0x0000 100 100 000 Old_age
Offline - 0
176 Erase_Fail_Count_Chip 0x0000 100 100 000 Old_age
Offline - 0
177 Wear_Leveling_Count 0x0000 100 100 050 Old_age
Offline - 0
178 Used_Rsvd_Blk_Cnt_Chip 0x0000 100 100 000 Old_age
Offline - 0
181 Program_Fail_Cnt_Total 0x0000 100 100 000 Old_age
Offline - 0
182 Erase_Fail_Count_Total 0x0000 100 100 000 Old_age
Offline - 0
192 Power-Off_Retract_Count 0x0000 100 100 000 Old_age
Offline - 2
194 Temperature_Celsius 0x0000 100 100 000 Old_age
Offline - 40
195 Hardware_ECC_Recovered 0x0000 100 100 000 Old_age
Offline - 19693
196 Reallocated_Event_Count 0x0000 100 100 016 Old_age
Offline - 0
197 Current_Pending_Sector 0x0000 100 100 000 Old_age
Offline - 0
198 Offline_Uncorrectable 0x0000 100 100 000 Old_age
Offline - 0
199 UDMA_CRC_Error_Count 0x0000 100 100 050 Old_age
Offline - 0
232 Available_Reservd_Space 0x0000 100 100 000 Old_age
Offline - 100
241 Total_LBAs_Written 0x0000 100 100 000 Old_age
Offline - 22065
242 Total_LBAs_Read 0x0000 100 100 000 Old_age
Offline - 13709
245 Unknown_Attribute 0x0000 100 100 000 Old_age
Offline - 38040

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 Extended offline Completed without error
00% 10 -
# 2 Short offline Completed without error 00%
4 -

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
7 0 65535 Read_scanning was completed without error
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.