Re: Self-tests for any drive in enclosure always executed by drive in bay 0

Hagen Tronstedt wrote:
> Hi there,
>
> I'm using a 4-bay external USB enclosure type JMicron JMS539 (ID 152d:0539,
> full lsusb see attachment) equipped with 4 actual drives. These do show up as
> devices to the Linux host computer like this
>
> usb-ST4000DM_000-1F2168_000000000000-0:0 -> ../../sdb
> usb-ST315005_41AS_000000000000-0:1 -> ../../sdc
> usb-ST315005_41AS_000000000000-0:2 -> ../../sdd
> usb-SAMSUNG_HD204UI_000000000000-0:3 -> ../../sde
>
> I can query each of them fine with smartctl -a /dev/sd[bcde].
> I can start a short self-test on the first drive with smartctl -t short
> /dev/sdb successfully and do find a corresponding log entry afterwards.
>
> Yet, when I start a self-test for any other drive, like smartctl -t short
> /dev/sdc, again the test is logged with drive sdb, the first one in the
> enclosure, no matter which drive I requested to test. The log for the
> designated drive remains unchanged (it does have entries from the time where
> the disk was attached to the mainboard).
> So it appears that the self-test command is misdirected, always to the first
> drive. Any idea how I could fix that?

This looks like a subtle bug in the SAT layer of the USB bridge.

Some (DATA IN?) commands commands are routed to the correct drive behind 
the SATA port multiplier but other (NON DATA?) commands are apparently not.

Please check whether other NON DATA commands work or not. For example 
change the Advanced Power Management level and then check which drive 
was affected:

smartctl -s apm,128 /dev/sdX  (min power w/o standby)
smartctl -g apm /dev/sdX
smartctl -s apm,254 /dev/sdX  (max performance)
smartctl -g apm /dev/sdX
smartctl -s apm,off /dev/sdX (APM off)
smartctl -g apm /dev/sdX

Thanks,
Christian


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