SMART - Understanding Offline Data Collection
General Tech Bugs & Fixes 2 years ago
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2 years ago
I have two Kingston A400 120GB SSD as cache in a Synology NAS, which don't seem to support automatic offline data collection.
Yet when I check the attributes marked as "Offline", the
RAW_VALUEone of them keeps changing (specifically246 Total_Erase_Count), even if I dont run the manual offline data collection or self-tests in between. I checked if smartd was running just in case, but it isn't. Same thing happens with the other identical SSD.Questions:
Output of
smartctl -a:=== START OF INFORMATION SECTION === Model Family: Phison Driven SSDs Device Model: KINGSTON SA400S37120G Serial Number: [...] LU WWN Device Id: [...] Firmware Version: 03070009 User Capacity: 120,034,123,776 bytes [120 GB] Sector Size: 512 bytes logical/physical Rotation Rate: Solid State Device Device is: In smartctl database [for details use: -P show] ATA Version is: ACS-3 T13/2161-D revision 4 SATA Version is: SATA 3.2, 6.0 Gb/s (current: 1.5 Gb/s) Local Time is: Fri Apr 12 01:55:30 2019 -03 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: ( 0) seconds. Offline data collection capabilities: (0x35) SMART execute Offline immediate. No Auto Offline data collection support. Abort Offline collection upon new command. No Offline surface scan supported. Self-test supported. Conveyance Self-test supported. No 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: (0x00) Error logging NOT 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. SMART Attributes Data Structure revision number: 5 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x0032 100 100 000 Old_age Always - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 710 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 5 148 Unknown_Attribute 0x0000 100 100 000 Old_age Offline - 0 149 Unknown_Attribute 0x0000 100 100 000 Old_age Offline - 0 167 Unknown_Attribute 0x0000 100 100 000 Old_age Offline - 0 168 SATA_Phy_Error_Count 0x0012 100 100 000 Old_age Always - 0 169 Unknown_Attribute 0x0000 100 100 000 Old_age Offline - 65 170 Bad_Blk_Ct_Erl/Lat 0x0000 100 100 010 Old_age Offline - 0/78 172 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0 173 MaxAvgErase_Ct 0x0000 100 100 000 Old_age Offline - 0 181 Program_Fail_Cnt_Total 0x0032 100 100 000 Old_age Always - 0 182 Erase_Fail_Count_Total 0x0000 100 100 000 Old_age Offline - 0 187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0 192 Unsafe_Shutdown_Count 0x0012 100 100 000 Old_age Always - 1 194 Temperature_Celsius 0x0022 024 025 000 Old_age Always - 24 (Min/Max 24/25) 196 Not_In_Use 0x0032 100 100 000 Old_age Always - 0 199 CRC_Error_Count 0x0032 100 100 000 Old_age Always - 0 218 CRC_Error_Count 0x0032 100 100 000 Old_age Always - 4 231 SSD_Life_Left 0x0000 100 100 000 Old_age Offline - 0 233 Flash_Writes_GiB 0x0032 100 100 000 Old_age Always - 396 241 Lifetime_Writes_GiB 0x0032 100 100 000 Old_age Always - 304 242 Lifetime_Reads_GiB 0x0032 100 100 000 Old_age Always - 228 244 Average_Erase_Count 0x0000 100 100 000 Old_age Offline - 2 245 Max_Erase_Count 0x0000 100 100 000 Old_age Offline - 10 246 Total_Erase_Count 0x0000 100 100 000 Old_age Offline - 3827 SMART Error Log not supported SMART Self-test Log not supported Selective Self-tests/Logging not supported