Rodrigo,
I would be very wary of this configuration, even if it is supported.
Even with metro-cluster, this is still depending on 4 separate controllers, if one of them is down, that may cause corruption on that dynamic disk.
Yes, a takeover/giveback should not cause a problem, and prevent a controller down situation, but there are many reasons for a takeover (or givebacks) to not work correctly from time to time.
For the I/O errors, my suspicion is that the disk timeout is not correct, check that:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Disk\TimeOutValue to 190
Please verify the above value/key with other sources, I am typing this from memory.
I would believe that one large 20+ TB 64-bit sync-mirrored aggregate off of one controller would be the place to put those virtual disks that make up that one dynamic disk.
Anyone else agree?
I have a sense of deja vu on this configuration..... years ago spending all night restoring a corrupted 36 GB dynamic disk when one of the four 9 GB disks failed.
Then a few months later moved those file shares onto Netapp RAID-4 and use snapshots and snapvault instead of tape backup.
Rodrigo, is this data backed up? I hope so...
-Matt