ZFS (zpool) doesn't detect failed drive

[Harald Schmalzbauer]

Hello,

one drive of my mirror failed today, but 'zpool staus' shows it "online".
Every process using a ZFS mount hangs. Also 'zpool offline /dev/ad1' 
hangs infinitely.

Here's the dmesg of the failing (and correctly detached) device:
ad1: TIMEOUT - FLUSHCACHE48 retrying (1 retry left)
ata3: port is not ready (timeout 10000ms) tfd = 00000080
ata3: hardware reset timeout
ad1: FAILURE - device detached

But:
zpool status
   pool: URUBAmirrorP1
  state: ONLINE
status: One or more devices are faulted in response to IO failures.
action: Make sure the affected devices are connected, then run 'zpool 
clear'.
    see: http://www.sun.com/msg/ZFS-8000-JQ
  scrub: none requested
config:

	NAME        STATE     READ WRITE CKSUM
	URUBAmirrorP1  ONLINE       0    7K     0
	  ad1       ONLINE       3 14,9K     0
	  ad2       ONLINE       0     0     0



Reboot doesn't work, somebody had to reset the machine.
How should such a error event be handled??? Isn't a mirror useless if 
there's no way to continue with one remaining good drive?
If the OS was on the same pool the complete machine is unaccessable with 
a failing drive..?!?

Thanks,

-Harry


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