Re: Seagate ST6000DM003-2CY186 "flapping". Disconnecting and reconnecting randomly.
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Date: Mon, 10 Aug 2026 22:02:51 UTC
Found the problem: >Model Family: Seagate BarraCuda 3.5 (SMR) SMR drives are incompatible with ZFS (and I personally recommend against using them for any purpose whatsoever). ---------------------------------------- 2026-08-10T21:49:38Z Jonathan <jonathan@kc8onw.net>: > I have a ST6000DM003-2CY186 as part of a ZFS array [1] and it keeps dropping > out of the array with the messages below showing up in dmesg. How can I > figure out more specifically why it's dropping and get it to stay? > > I've had the drive in 2 different bays in my hotswap cage, used 2 different > cables connected to 2 different motherboard ports and now having it running > next to the server directly attached to take the hotswap bay out of the > picture. I set a loader hint to downgrade to SATA 2 but that hasn't helped > either. I'm very much running out of ideas. What really drives me crazy is > that (other than the total time taken because of the internal SMR > housekeeping) it made it through the initial resilver without a problem. > There doesn't seem to be much of a pattern to the drops. It doesn't > correlate with any activity or specific span of lack of activity that I've > been able to identify. > > ada1 at ahcich3 bus 0 scbus3 target 0 lun 0 > ada1: <ST6000DM003-2CY186 0001> s/n ZF200T9W detached > (ada1:ahcich3:0:0:0): Periph destroyed > ada1 at ahcich3 bus 0 scbus3 target 0 lun 0 > ada1: <ST6000DM003-2CY186 0001> ACS-3 ATA SATA 3.x device > ada1: Serial Number ZF200T9W > ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) > ada1: Command Queueing enabled > ada1: 5723166MB (11721045168 512 byte sectors) > ada1: quirks=0x1<4K> > > The SMART data is: > > ``` > smartctl 7.5 2025-04-30 r5714 [FreeBSD 15.0-RELEASE-p12 amd64] (local build) > Copyright (C) 2002-25, Bruce Allen, Christian Franke, www.smartmontools.org > > === START OF INFORMATION SECTION === > Model Family: Seagate BarraCuda 3.5 (SMR) > Device Model: ST6000DM003-2CY186 > Serial Number: ZF200T9W > LU WWN Device Id: 5 000c50 0a4eaf8d3 > Firmware Version: 0001 > User Capacity: 6,001,175,126,016 bytes [6.00 TB] > Sector Sizes: 512 bytes logical, 4096 bytes physical > Rotation Rate: 5425 rpm > Device is: In smartctl database 7.5/5706 > ATA Version is: ACS-3 T13/2161-D revision 5 > SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s) > Local Time is: Mon Aug 10 17:42:31 2026 EDT > 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: (0x82) Offline data collection activity > was completed without error. > 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: ( 0) 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: ( 798) minutes. > Conveyance self-test routine > recommended polling time: ( 2) minutes. > SCT capabilities: (0x30a5) SCT Status supported. > SCT Data Table 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 073 064 006 Pre-fail Always - 20195647 > 3 Spin_Up_Time 0x0003 098 092 000 Pre-fail Always - 0 > 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 85 > 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0 > 7 Seek_Error_Rate 0x000f 070 060 045 Pre-fail Always - 10214727 > 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 726h+57m+29.053s > 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 > 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 63 > 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 100 100 000 Old_age Always - 0 > 188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0 0 2 > 189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0 > 190 Airflow_Temperature_Cel 0x0022 060 044 040 Old_age Always - 40 (Min/Max 39/40) > 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 - 94 > 193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 315 > 194 Temperature_Celsius 0x0022 040 056 000 Old_age Always - 40 (0 16 0 0 0) > 195 Hardware_ECC_Recovered 0x001a 073 064 000 Old_age Always - 20195647 > 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 > 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 > 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 > 240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 237h+57m+03.832s > 241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 8646277300 > 242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 888924720 > > 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. > > The above only provides legacy SMART information - try 'smartctl -x' for more > ``` > > [1] Yes I know it's SMR and that's a bad idea for ZFS or any RAID but it's a > stopgap to hopefully keep the array redundant until prices get less crazy. > > -- > Jonathan