Hi David,
On 21-03-16 10:08, David Webb wrote:
I am sorry but the 't' option (i.e. US_FL_NO_ATA_1X) may not be robust enough.
Yesterday after leaving the system running for a few hours the usb disk would
no longer connect.
Today when I restarted the system with the 't' option, again the disk would
not connect.
I then tried repeatedly disconnecting and connecting the usb disk without
restarting the system. After four failures the disk mounted correctly. I
continued disconnecting and connecting the disk and it worked every
time.
I repeated the tests with the 'u' option after restarting the system. Amongst
the output is the message:
kernel: usb 2-7: UAS is blacklisted for this device, using usb-storage
instead
And the connection worked every time.
On this basis I recommend using the flag US_FL_IGNORE_UAS as there must be some
other potential conflict which is not handled by the flag US_FL_NO_ATA_1X. The
change does not seem to have a large effect on the write speed - which is
still of order 100 MB/s.
/* Reported-by: David Webb <djw@xxxxxxxxx> */
UNUSUAL_DEV(0x0bc2, 0x331a, 0x0000, 0x9999,
"Seagate",
"Expansion Desk",
USB_SC_DEVICE, USB_PR_DEVICE, NULL,
US_FL_IGNORE_UAS),
US_FL_IGNORE_UAS is a really big hammer, and there are significant performance
benefits to using uas (mostly for random r/w access). Can you try again with the
t quirk and when the drive fails to detect, collect error messages from
"dmesg" and include these error messages in your next mail ?
Thanks & Regards,
Hans
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