mirror handling of broken harddrives

[Terje Elde]

Hi,

So far Im really happy with geom, but there is a issue Im curious about.

Given faulty hardware, resulting in:

ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=35170616
ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=35170616
ad0: FAILURE - READ_DMA timed out

How would this be handled by geom_mirror if it was a part of a two-plex
volume?

Would geom_mirror automatically recover by reading from the other plex?

Would it mark the broken plex as down, and not use/trust it?

Also, when using this drive, all disk IO (against the same disk?) freezes
while it`s trying to complete these reads.  Would geom_mirror be able to
recover quicker from this, by satisfying the request from the other plex?

Thanks for any input,
Terje Elde