Eu rodei o Ubuntu 18.04 e estava revisando as mensagens de inicialização para ter certeza de que a atualização (que aconteceu há uma semana) agora está estável.
Eu encontrei as seguintes mensagens (a parte delimitada por ** é realmente vermelha em journalctl -b ):
May 19 14:38:07 srv kernel: scsi 0:0:0:1: Attached scsi generic sg4 type 13
May 19 14:38:07 srv kernel: sd 0:0:0:0: [sdd] 3906963456 512-byte logical blocks: (2.00 TB/1.82 TiB)
May 19 14:38:07 srv kernel: sd 0:0:0:0: [sdd] Write Protect is off
May 19 14:38:07 srv kernel: sd 0:0:0:0: [sdd] Mode Sense: 47 00 10 08
May 19 14:38:07 srv kernel: **sd 0:0:0:0: [sdd] No Caching mode page found**
May 19 14:38:07 srv kernel: **sd 0:0:0:0: [sdd] Assuming drive cache: write through**
May 19 14:38:07 srv kernel: sdd: sdd1
May 19 14:38:07 srv kernel: sd 0:0:0:0: [sdd] Attached SCSI disk
May 19 14:38:07 srv kernel: scsi 0:0:0:1: **Wrong diagnostic page; asked for 1 got 8**
May 19 14:38:07 srv kernel: scsi 0:0:0:1: **Failed to get diagnostic page 0x1**
May 19 14:38:07 srv kernel: scsi 0:0:0:1: **Failed to bind enclosure -19**
May 19 14:38:07 srv kernel: ses 0:0:0:1: Attached Enclosure device
Este disco é reconhecido de outra forma corretamente (como um dispositivo conectado via USB):
# lshw
(...)
*-usb
description: Mass storage device
product: My Passport 0820
vendor: Western Digital
physical id: 6
bus info: usb@2:6
logical name: scsi0
version: 10.07
serial: 575855314538334B4B4C5938
capabilities: usb-3.00 scsi emulated scsi-host
configuration: driver=usb-storage maxpower=896mA speed=5000Mbit/s
*-disk
description: SCSI Disk
product: My Passport 0820
vendor: WD
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/sdd
version: 1007
serial: WXU1E83KKLY8
size: 1862GiB (2TB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=6 logicalsectorsize=512 sectorsize=512 signature=26103748
*-volume
description: EXT3 volume
vendor: Linux
physical id: 1
bus info: scsi@0:0.0.0,1
logical name: /dev/sdd1
version: 1.0
serial: 841ffb76-1e8f-46b6-bd4f-a3bf4e4b56a3
size: 1862GiB
capacity: 1862GiB
capabilities: primary bootable journaled extended_attributes large_files ext3 ext2 initialized
configuration: created=2018-05-19 13:31:22 filesystem=ext3 label=REAR-000 lastmountpoint=/mnt/rear modified=2018-05-19 14:34:12 mounted=2018-05-19 14:32:47 state=clean
*-enclosure UNCLAIMED
description: SCSI Enclosure
product: SES Device
vendor: WD
physical id: 0.0.1
bus info: scsi@0:0.0.1
version: 1007
serial: WXU1E83KKLY8
configuration: ansiversion=6
O que essas mensagens significam?