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After some recent updates my server told me that it couldn't find my external backup disk anymore which was mounted using its disk ID.

So I checked and noticed that the ID for my external backup drive had changed: from ata-ST3000DM001… to usb-Seagate_Expansion_Desk…

Fair enough, ok it's a USB drive. But then my backup script complained that it couldn't read the SMART data, which was never a problem before with the previous identifier.

I could remove the smart check from my script but I don't see that as an option since it would mean that I won't get notified if this disk breaks.

Things I have tried so far:

smartctl -d sat -a /dev/disk/by-id/usb-…

smartctl (-d sat) -a /dev/sda

reboot

Useful Information:

lsusb:
Bus 005 Device 002: ID 0bc2:331a Seagate RSS LLC

smartctl:
smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.4.0-122-generic] (local  build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke,   www.smartmontools.org

Read Device Identity failed: scsi error unsupported field in scsi command

A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options.

uname:
4.4.0-122-generic

Thank you in advance!

Elo I
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1 Answers1

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Acording to a ticket in a smartctl tracker, this is a known bug and modern kernels disable SAT ATA PASS-THROUGH for seagate enclosures, when in UAS mode due to problems with some of them.

Fortunately, enclosure with id 0bc2:331a seems to be fully functional if you disable this behavior.

To do so you should add

quirks=0bc2:331a:

option to usb-storage module.

Alternatively, you could disable UAS. In this case use

quirks=0bc2:331a:u

option.

I found this answer to be very helpful in understanding how to properly apply this module option.

alexeypetrenko
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    It might help to explain how they would add that to the module. – Thomas Ward May 17 '18 at 19:02
  • Thank you very much! This has solved the problem for now! Now I just need to wait till the end of next week to see if that change has any impact on my transfer rates! – Elo I May 20 '18 at 13:02