Dm-Raid1 Issue

Hi,

I want to run Dm-raid1 or dm-mirror in degraded mode.

So say I have 2 Disks and I create a mirror device over that.
Create EXT4 over the new device, mounted it and started a huge number of IO
using dd on that device.
Now while the IO are going on, I failed the 'Default' Mirror in the mirror
set.

Then ideally the IO operation should not break. All the IO should go to
other mirror.
But it is not happening. Either my dd command hangs till the default device
comes back or it returns an IO error
and breaks the IO operations on disk.

Is this is known behavior ?
Or
I am missing something in configuration ?

I am using Kernel 2.6.32.
Mirror target's version is 1.12.0

Please help !

Thanks,
Gaurav
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