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Apr 30 14:59:38 Tower kernel: sd 2:0:0:0: [sdc] 39063650304 512-byte logical blocks: (20.0 TB/18.2 TiB)
Apr 30 14:59:38 Tower kernel: sd 2:0:0:0: [sdc] 4096-byte physical blocks
Apr 30 14:59:38 Tower kernel: sd 2:0:0:0: [sdc] Write Protect is off
Apr 30 14:59:38 Tower kernel: sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
Apr 30 14:59:38 Tower kernel: sd 2:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 30 14:59:38 Tower kernel: sd 2:0:0:0: [sdc] Preferred minimum I/O size 4096 bytes
Apr 30 14:59:38 Tower kernel: sdc: sdc1
Apr 30 14:59:38 Tower kernel: sd 2:0:0:0: [sdc] Attached SCSI disk
Apr 30 14:59:59 Tower emhttpd: WDC_WD201KFGX-68BKJN0_8LGN4XZF (sdc) 512 39063650304
Apr 30 14:59:59 Tower kernel: mdcmd (2): import 1 sdc 64 19531825100 0 WDC_WD201KFGX-68BKJN0_8LGN4XZF
Apr 30 14:59:59 Tower kernel: md: import disk1: (sdc) WDC_WD201KFGX-68BKJN0_8LGN4XZF size: 19531825100 
Apr 30 14:59:59 Tower emhttpd: read SMART /dev/sdc
Apr 30 15:00:08 Tower emhttpd: shcmd (32): echo 128 > /sys/block/sdc/queue/nr_requests
May  1 21:57:00 Tower kernel: I/O error, dev sdc, sector 1953509432 op 0x0:(READ) flags 0x0 phys_seg 4 prio class 2
May  1 21:57:00 Tower kernel: I/O error, dev sdc, sector 1953509432 op 0x1:(WRITE) flags 0x0 phys_seg 4 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#12 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#12 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#12 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#12 CDB: opcode=0x88 88 00 00 00 00 04 88 ae 94 68 00 00 05 40 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473011816 op 0x0:(READ) flags 0x0 phys_seg 168 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#15 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#15 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#15 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#15 CDB: opcode=0x88 88 00 00 00 00 04 88 ae 99 a8 00 00 02 f0 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473013160 op 0x0:(READ) flags 0x0 phys_seg 94 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#16 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#16 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#16 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#16 CDB: opcode=0x88 88 00 00 00 00 04 88 ae 9c 98 00 00 02 50 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473011816 op 0x1:(WRITE) flags 0x4000 phys_seg 168 prio class 2
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473013912 op 0x0:(READ) flags 0x0 phys_seg 74 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#17 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#17 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#17 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#17 CDB: opcode=0x88 88 00 00 00 00 04 88 ae 9e e8 00 00 05 40 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473014504 op 0x0:(READ) flags 0x4000 phys_seg 168 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#18 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#18 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#18 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#18 CDB: opcode=0x88 88 00 00 00 00 04 88 ae a4 28 00 00 00 80 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473015848 op 0x0:(READ) flags 0x0 phys_seg 16 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#19 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#19 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#19 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#19 CDB: opcode=0x88 88 00 00 00 00 04 88 ae a4 a8 00 00 05 40 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473015976 op 0x0:(READ) flags 0x0 phys_seg 168 prio class 2
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473013160 op 0x1:(WRITE) flags 0x4000 phys_seg 168 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#20 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#20 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#20 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#20 CDB: opcode=0x88 88 00 00 00 00 04 88 ae a9 e8 00 00 05 40 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473017320 op 0x0:(READ) flags 0x0 phys_seg 168 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#21 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=21s
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#21 Sense Key : 0x5 [current] 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#21 ASC=0x21 ASCQ=0x4 
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] tag#21 CDB: opcode=0x88 88 00 00 00 00 04 88 ae af 28 00 00 05 40 00 00
May  1 21:57:15 Tower kernel: I/O error, dev sdc, sector 19473018664 op 0x0:(READ) flags 0x0 phys_seg 168 prio class 2
May  1 21:57:15 Tower kernel: sd 2:0:0:0: [sdc] Synchronizing SCSI cache
May  2 09:58:12 Tower emhttpd: error: hotplug_devices, 1709: No such file or directory (2): tagged device WDC_WD201KFGX-68BKJN0_8LGN4XZF was (sdc) is now (sdg)

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Also attached a diagnostic zip.

 

The Dashboard isn't responsive—nothing happens when I try to spin down the disabled drive or spin down the array. The Parity Check remains paused, can't cancel it.

tower-diagnostics-20240502-1022.zip

Looks like a power/connection problem with disk1, check/replace cables and post new diags after array start.

On 5/2/2024 at 10:47 AM, JorgeB said:

Looks like a power/connection problem with disk1, check/replace cables and post new diags after array start.

 

Whew, replaced the data cables and rebuilt Disk 1, seems t o be back to normal now... thank you so much.

 

Attached a new diags just in case... thank you again.

tower-diagnostics-20240516-1107.zip

Everything looks good so far, no errors or timeouts during the rebuild.