Hope you don't mind I piggyback on your thread - I'm having a similar issue.

  

Trying to add a device to my array (also SAS drive), but I can't assign it to a disk and the mount button is grayed out in Unassigned Devices. I've successfully swapped and added devices to the array in the past leading me to believe there might be an issue with this drive (it's an ebay special).

 

Quote

Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Spinning up disk...
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Read Capacity(16) failed: Result: hostbyte=0x00 driverbyte=0x08
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Sense Key : 0x2 [current] [descriptor]
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] ASC=0x4 ASCQ=0x2
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Read Capacity(10) failed: Result: hostbyte=0x00 driverbyte=0x08
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Sense Key : 0x2 [current] [descriptor]
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] ASC=0x4 ASCQ=0x2
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] 0 512-byte logical blocks: (0 B/0 B)
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] 0-byte physical blocks
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Write Protect is off
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Mode Sense: f7 00 10 08
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Write cache: disabled, read cache: enabled, supports DPO and FUA
Nov 24 11:34:47 Beelzebub kernel: sd 7:0:1:0: [sdc] Spinning up disk...
Nov 24 11:36:08 Beelzebub kernel: sd 7:0:1:0: [sdc] Read Capacity(16) failed: Result: hostbyte=0x00 driverbyte=0x08
Nov 24 11:36:08 Beelzebub kernel: sd 7:0:1:0: [sdc] Sense Key : 0x2 [current] [descriptor]
Nov 24 11:36:08 Beelzebub kernel: sd 7:0:1:0: [sdc] ASC=0x4 ASCQ=0x2
Nov 24 11:36:08 Beelzebub kernel: sd 7:0:1:0: [sdc] Read Capacity(10) failed: Result: hostbyte=0x00 driverbyte=0x08
Nov 24 11:36:08 Beelzebub kernel: sd 7:0:1:0: [sdc] Sense Key : 0x2 [current] [descriptor]
Nov 24 11:36:08 Beelzebub kernel: sd 7:0:1:0: [sdc] ASC=0x4 ASCQ=0x2
Nov 24 11:36:08 Beelzebub kernel: sd 7:0:1:0: [sdc] Attached SCSI disk
Nov 24 11:36:40 Beelzebub emhttpd: device /dev/sdc has size zero

The 'Beelzebub emhttpd: device /dev/sdc has size zero' log entry repeats itself.

I'm not sure which troubleshooting steps to take at this point and was hoping I could get some guidance. Thank you.

beelzebub-diagnostics-20201124-2003.zip

On 11/24/2020 at 8:48 PM, slobert said:

Hope you don't mind I piggyback on your thread

Don't hijack

On 12/2/2020 at 1:48 PM, trurl said:

Don't hijack

Apologies. Won't happen again.

If you still have a problem post new diagnostics.