On Wed, 2017-11-15 at 17:02 -0500, Alan Stern wrote: > On Wed, 15 Nov 2017, Jérôme Carretero wrote: > > > Because with several of these drives / lots of activity / > occasional > > > issues, it looks like it will be hard to catch (yes I can use > > > usbmon). > > > > > > - It looks like there is no configurable timeout for USB MSC > requests. > > > Perhaps the device is not responding in time and this is why > it's > > > reset? > > Timeouts are set by the SCSI layer. I believe they are rather long > (30 seconds, by default). Presumably they are configurable, although > I would have to do some digging to figure out how. They're in /sys/class/scsi_device/<id>/device/timeout jejb@bedivere:~> ls -l /sys/class/scsi_device/0\:0\:0\:0/device/timeout -rw-r--r-- 1 root root 4096 Nov 15 14:37 /sys/class/scsi_device/0:0:0:0/device/timeout jejb@bedivere:~> cat /sys/class/scsi_device/0\:0\:0\:0/device/timeout 30 You can actually have a udev rule adjust them on a per device id basis. James
