I see some issues with da1, but how does that figure in to the GUI issue?
[root@freenas] ~# smartctl -a /dev/da1
smartctl 6.4 2015-06-04 r4109 [FreeBSD 10.3-RELEASE amd64] (local build)
Copyright (C) 2002-15, Bruce Allen, Christian Franke, 
www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family:     Hitachi Ultrastar 7K3000
Device Model:     Hitachi HUA723020ALA640
Serial Number:    MK0151YFKMJ59A
LU WWN Device Id: 5 000cca 223f32644
Firmware Version: MK7OAA10
User Capacity:    2,000,398,934,016 bytes [2.00 TB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 2.6, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Mon Feb 17 11:00:03 2020 EST
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:                (   28) seconds.
Offline data collection
capabilities:                    (0x5b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.
                                        Self-test supported.
                                        No 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:        ( 325) 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: 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   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   133   133   054    Pre-fail  Offline      -       91
  3 Spin_Up_Time            0x0007   205   205   024    Pre-fail  Always       -       333 (Average 276)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       185
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   125   125   020    Pre-fail  Offline      -       30
  9 Power_On_Hours          0x0012   099   099   000    Old_age   Always       -       13991
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       47
192 Power-Off_Retract_Count 0x0032   098   098   000    Old_age   Always       -       3447
193 Load_Cycle_Count        0x0012   098   098   000    Old_age   Always       -       3447
194 Temperature_Celsius     0x0002   206   206   000    Old_age   Always       -       29 (Min/Max 19/58)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       870
SMART Error Log Version: 1
ATA Error Count: 958 (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 958 occurred at disk power-on lifetime: 13972 hours (582 days + 4 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
  -- -- -- -- -- -- --
  84 51 11 6f 6e 60 02  Error: ICRC, ABRT at LBA = 0x02606e6f = 39874159
  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 80 10 00 6e 60 40 00      00:52:06.701  READ FPDMA QUEUED
  60 80 10 f8 6c 60 40 00      00:52:06.697  READ FPDMA QUEUED
  60 80 10 20 80 53 40 00      00:52:06.694  READ FPDMA QUEUED
  60 80 08 18 7f 53 40 00      00:52:06.694  READ FPDMA QUEUED
  60 80 00 48 6b 48 40 00      00:52:06.689  READ FPDMA QUEUED
Error 957 occurred at disk power-on lifetime: 13972 hours (582 days + 4 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
  -- -- -- -- -- -- --
  84 51 11 37 a6 64 02  Error: ICRC, ABRT at LBA = 0x0264a637 = 40150583
  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 80 08 d8 75 45 40 00      00:52:06.676  READ FPDMA QUEUED
  60 80 00 c8 a5 64 40 00      00:52:06.669  READ FPDMA QUEUED
  60 80 10 38 a5 64 40 00      00:52:06.660  READ FPDMA QUEUED
  60 80 08 30 a4 64 40 00      00:52:06.660  READ FPDMA QUEUED
  60 80 00 48 9d 58 40 00      00:52:06.660  READ FPDMA QUEUED
Error 956 occurred at disk power-on lifetime: 13972 hours (582 days + 4 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
  -- -- -- -- -- -- --
  84 51 21 8f a4 64 02  Error: ICRC, ABRT at LBA = 0x0264a48f = 40150159
  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 80 10 38 a5 64 40 00      00:52:06.653  READ FPDMA QUEUED
  60 80 08 48 9d 58 40 00      00:52:06.653  READ FPDMA QUEUED
  60 80 00 30 a4 64 40 00      00:52:06.652  READ FPDMA QUEUED
  2f 00 01 10 00 00 00 00      00:52:06.652  READ LOG EXT
  60 80 10 38 a5 64 40 00      00:52:06.640  READ FPDMA QUEUED
Error 955 occurred at disk power-on lifetime: 13972 hours (582 days + 4 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
  -- -- -- -- -- -- --
  84 51 41 87 9d 58 02  Error: ICRC, ABRT at LBA = 0x02589d87 = 39361927
  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 80 10 38 a5 64 40 00      00:52:06.640  READ FPDMA QUEUED
  60 80 08 30 a4 64 40 00      00:52:06.640  READ FPDMA QUEUED
  60 80 00 48 9d 58 40 00      00:52:06.639  READ FPDMA QUEUED
  ea 00 00 00 00 00 00 00      00:52:03.618  FLUSH CACHE EXT
  61 08 00 88 87 e0 40 00      00:52:03.617  WRITE FPDMA QUEUED
Error 954 occurred at disk power-on lifetime: 13972 hours (582 days + 4 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
  -- -- -- -- -- -- --
  84 51 51 af 86 4c 02  Error: ICRC, ABRT at LBA = 0x024c86af = 38569647
  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 80 10 40 40 4f 40 00      00:52:02.876  READ FPDMA QUEUED
  60 80 00 38 3f 4f 40 00      00:52:02.872  READ FPDMA QUEUED
  60 80 08 80 86 4c 40 00      00:52:02.870  READ FPDMA QUEUED
  60 80 10 68 84 4c 40 00      00:52:02.862  READ FPDMA QUEUED
  60 80 00 a8 31 44 40 00      00:52:02.861  READ FPDMA QUEUED
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%     13990         -
# 2  Short offline       Completed without error       00%     13989         -
# 3  Short offline       Completed without error       00%     13988         -
# 4  Short offline       Completed without error       00%     13987         -
# 5  Short offline       Completed without error       00%     13986         -
# 6  Short offline       Completed without error       00%     13985         -
# 7  Short offline       Completed without error       00%     13984         -
# 8  Short offline       Completed without error       00%     13983         -
# 9  Short offline       Completed without error       00%     13982         -
#10  Short offline       Completed without error       00%     13981         -
#11  Short offline       Completed without error       00%     13980         -
#12  Short offline       Completed without error       00%     13979         -
#13  Short offline       Completed without error       00%     13978         -
#14  Short offline       Completed without error       00%     13977         -
#15  Short offline       Completed without error       00%     13976         -
#16  Short offline       Completed without error       00%     13975         -
#17  Short offline       Completed without error       00%     13974         -
#18  Short offline       Completed without error       00%     13973         -
#19  Short offline       Completed without error       00%     13973         -
#20  Short offline       Completed without error       00%     13972         -
#21  Short offline       Completed without error       00%     13971         -
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.
[root@freenas] ~#