iscsi client hangs performing I/O on a dead target

[Andrew Snow]

> I was expecting that a failure on one of the disks (network down, target
> machine down) would be eventually detected and the raid turned to degraded
> but still usable.
> What happens now to me is that the whole raid device gets unusable for all
> the time the target is down.



If you're using gmirror, you might want to experiment with this setting:

kern.geom.mirror.timeout

Set it to something reasonably low like 10 seconds, and it will ignore 
an iSCSI device that is not responding more rapidly.