external USB disk spins off and mount gets destroyed

[Matthias Apitz]

Hello,

I've on my laptop (FreeBSD 12.0-CURRENT r314251 amd64) an external USB
disk which presents it like this on plugin:

Jun 17 12:50:10 c720-r342378 kernel: ugen0.4: <TOSHIBA External USB 3.0> at usbus0
Jun 17 12:50:10 c720-r342378 kernel: umass0 on uhub0
Jun 17 12:50:10 c720-r342378 kernel: umass0: <TOSHIBA External USB 3.0, class 0/0, rev 3.00/3.15, addr 7> on usbus0
Jun 17 12:50:10 c720-r342378 kernel: umass0:  SCSI over Bulk-Only; quirks = 0x0100
Jun 17 12:50:10 c720-r342378 kernel: umass0:1:0: Attached to scbus1
Jun 17 12:50:10 c720-r342378 kernel: (probe0:umass-sim0:0:0:0): REPORT LUNS. CDB: a0 00 00 00 00 00 00 00 00 10 00 00 
Jun 17 12:50:10 c720-r342378 kernel: (probe0:umass-sim0:0:0:0): CAM status: SCSI Status Error
Jun 17 12:50:10 c720-r342378 kernel: (probe0:umass-sim0:0:0:0): SCSI status: Check Condition
Jun 17 12:50:10 c720-r342378 kernel: (probe0:umass-sim0:0:0:0): SCSI sense: ILLEGAL REQUEST asc:20,0 (Invalid command operation code)
Jun 17 12:50:10 c720-r342378 kernel: (probe0:umass-sim0:0:0:0): Error 22, Unretryable error
Jun 17 12:50:10 c720-r342378 kernel: da0 at umass-sim0 bus 0 scbus1 target 0 lun 0
Jun 17 12:50:10 c720-r342378 kernel: da0: <TOSHIBA External USB 3.0 5438> Fixed Direct Access SPC-4 SCSI device
Jun 17 12:50:10 c720-r342378 kernel: da0: Serial Number 20181017010605F
Jun 17 12:50:10 c720-r342378 kernel: da0: 400.000MB/s transfers
Jun 17 12:50:10 c720-r342378 kernel: da0: 953869MB (1953525164 512 byte sectors)
Jun 17 12:50:10 c720-r342378 kernel: da0: quirks=0x2<NO_6_BYTE>

I've created with gpart(8) file systems like this:

# gpart show -l da0
=>        40  1953525088  da0  GPT  (932G)
          40        1024    1  extboot  (512K)
        1064         984       - free -  (492K)
        2048   536870912    2  extrootfs  (256G)
   536872960    16777216    3  extswap  (8.0G)
   553650176  1399873536    4  extbackupfs  (668G)
  1953523712        1416       - free -  (708K)

# mount /dev/gpt/extrootfs /mnt

The problem is, that after some time of idel, the disk spins down and
the mount gets destroyed:

Jun 17 12:52:51 c720-r342378 kernel: ugen0.4: <TOSHIBA External USB 3.0> at usbus0 (disconnected)
Jun 17 12:52:51 c720-r342378 kernel: umass0: at uhub0, port 10, addr 6 (disconnected)
Jun 17 12:52:51 c720-r342378 kernel: da0 at umass-sim0 bus 0 scbus1 target 0 lun 0
Jun 17 12:52:51 c720-r342378 kernel: da0: <TOSHIBA External USB 3.0 5438>  s/n 20181017010605F detached
Jun 17 12:52:51 c720-r342378 kernel: (da0:umass-sim0:0:0:0): Periph destroyed
Jun 17 12:52:51 c720-r342378 kernel: umass0: detached

What can I do to avoid this?

	matthias

-- 
Matthias Apitz, ✉ guru at unixarea.de, http://www.unixarea.de/ +49-176-38902045
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