Juan RP wrote:

>> I have a usb2/esata external drive I am using for backup via usb2
>> on several machines.
>> 
>> The esata works also, but I can't figure out if there is a way to
>> rescan the bus and attach the drive outside of a reboot.
>> 
>> Can drvctl(8) and atactl(8) be used to attach and detach the esata
>> drive in this manner? How do you configure drvctl to do this?
> 
> I don't know, but to use drvctl you'll have to add in your kernel:
> 
> pseudo-device drvctl

Thanks for the info. Unfortunately, at least with NetBSD 3.0.1_STABLE
it appears that neither atabus nor viaide can perform a rescan:

$ drvctl -r atabus2
drvctl: DRVRESCANBUS: Operation not supported by device

$ drvctl -r viaide1
drvctl: DRVRESCANBUS: Operation not supported by device