I had those exact same issues with 2.6.32-31-server.
After reading comments here i've now added kernel-ppa and installed 2.6.38-8-server through linux-image-server-lts-backport-natty package.
Now my raid is rebuilding (manually triggered) and it has gotten 7% so far. Before it stopped at 0,1% after loosing contact with the discs connected to the mvsas card resulting in kernel panic if i tried to rehotplug one of those drives.
I had those exact same issues with 2.6.32-31-server.
After reading comments here i've now added kernel-ppa and installed 2.6.38-8-server through linux-image- server- lts-backport- natty package.
Now my raid is rebuilding (manually triggered) and it has gotten 7% so far. Before it stopped at 0,1% after loosing contact with the discs connected to the mvsas card resulting in kernel panic if i tried to rehotplug one of those drives.