What does "SCSI error: return code = 0x08000002" (DID_OK, DRIVER_SENSE) events within in messages file mean when they include a description of <<vendor>>

Issue

• Events such as the following are reported:

    sd 0:0:0:0: [sda] tag#0 <<vendor>>ASC=0xe0 ASCQ=0x1 
    sd 0:0:0:0: [sda] tag#0 <<vendor>>ASC=0xe0 <<vendor>>ASCQ=0x81<<vendor>>ASCQ=0x80

• Events present in messages which include "<<vendor>>" string are not fully explained:

May 31 12:20:23 host kernel: sd 6:0:0:1: SCSI error: return code = 0x08000002
May 31 12:20:23 host kernel: Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
May 31 12:20:23 host kernel: sdd: Current: sense key: Illegal Request
May 31 12:20:23 host kernel:     <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1

or

May 31 12:20:23 host kernel: sd 1:0:0:4: [sdk] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 31 12:20:23 host kernel: sd 1:0:0:4: [sdk] Sense Key : Illegal Request [current]
May 31 12:20:23 host kernel: sd 1:0:0:4: [sdk] <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1

or

May 31 12:20:23 host kernel: sd 6:0:0:1: SCSI error: return code = 0x08000002
May 31 12:20:23 host kernel: Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
May 31 12:20:23 host kernel: sdd: Current: sense key: Medium Error
May 31 12:20:23 host kernel:     ASC=0x44 <<vendor>> ASCQ=0xc6ASC=0x44 ASCQ=0xc6

or

May 31 12:20:23 host kernel: st3: Sense Key : Hardware Error [current]
May 31 12:20:23 host kernel: st3: ASC=0x26 <<vendor>> ASCQ=0x81

or

Jun 22 04:02:10 host kernel: storvsc: Current: sense key: Unit Attention
Jun 22 04:02:10 host kernel:    <<vendor>> ASC=0x8b ASCQ=0x2ASC=0x8b ASCQ=0x2 

• What do <<vendor>> events mean?
• How do I determine what these events mean?

• How can I find out more information about <<vendor>> events in messages?

• Seeing ' SCSI error: return code = 0x08000002 with "ASC=0xc <<vendor>> ASCQ=0xa8" ' in messages

• Seeing ' SCSI error: return code = 0x08000002 with "ASC=0x44 <<vendor>> ASCQ=0xc6" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0x80 ASCQ=0x86" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0x80 ASCQ=0x87" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0x94 ASCQ=0x1" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0x95 ASCQ=0x1" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0x95 ASCQ=0x50" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0xc0 ASCQ=0x0" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0xc0 ASCQ=0x3" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0xc4 ASCQ=0x1" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0xe4 ASCQ=0x0" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0xf1 ASCQ=0x80" ' in messages
• Seeing ' SCSI error: return code = 0x08000002 with "<<vendor>> ASC=0xf1 ASCQ=0xd2" ' in messages