freebsd stable - Nov 2008 - firewire disk disconnected but da* remains?

I am a firewire newbie, so forgive me the following question.
I disconnect external firewire HDD, firewire subsystem notices this but
da0 device entry persists. Is this correct/expected behavior?

on connect:
kernel: fwohci0: BUS reset
kernel: fwohci0: node_id=0xc800ffc1, gen=2, CYCLEMASTER mode
kernel: firewire0: 2 nodes, maxhop <= 1, cable IRM = 1 (me)
kernel: firewire0: bus manager 1 (me)
kernel: fwohci0: txd err=14 ack busy_X
last message repeated 2 times
kernel: fwohci0: BUS reset
kernel: fwohci0: node_id=0xc800ffc1, gen=3, CYCLEMASTER mode
kernel: firewire0: 2 nodes, maxhop <= 1, cable IRM = 1 (me)
kernel: firewire0: bus manager 1 (me)
kernel: firewire0: New S400 device ID:0050770e00071002
kernel: da0 at sbp0 bus 0 target 0 lun 0
kernel: da0: <Prolific (1394-ATAPI rev1 2804> Fixed Simplified Direct
Access SCSI-4 device
kernel: da0: 50.000MB/s transfers
kernel: da0: 381554MB (781422768 512 byte sectors: 255H 63S/T 48641C)
kernel: GEOM_LABEL: Label for provider da0s1 is ufs/extbackup.

on disconnect:
kernel: fwohci0: BUS reset
kernel: fwohci0: node_id=0xc800ffc0, gen=4, CYCLEMASTER mode
kernel: firewire0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
kernel: firewire0: bus manager 0 (me)

camcontrol rescan all done some time later stuck in cbwait state.

System is recent releng/7 amd64.

-- 
Andriy Gapon

On Fri, 2008-11-07 at 13:37 +0200, Andriy Gapon wrote:
> I am a firewire newbie, so forgive me the following question.
> I disconnect external firewire HDD, firewire subsystem notices this but
> da0 device entry persists. Is this correct/expected behavior?
Yes.  From sbp(4):

 Some users familiar with umass(4) might wonder why the device is not
 detached at the CAM layer when the device is unplugged.  It is detached
 only if the device has not been plugged again during several bus resets.
 This is for preventing to detach an active file system even when the
 device cannot be probed correctly for some reason after a bus reset or
 when the device is temporary disconnected because the user changes the
 bus topology.  If you want to force to detach the device, run ``fwcontrol
 -r'' several times or set hw.firewire.hold_count=0 by sysctl(1).

Gavin