Sorry for responding to such a old inquiry.
I ran into the the same problem today running Iometer2006 under Windows Server 2008 R2 VM with fresh set of RDMs from SAN.
The Dynamo.exe screens shows that all Writes are failing:
Image may be NSFW.
Clik here to view.
It turned out that Windows2008R2 places all new disks in Offline and uninitialized mode after initial discovery.
You can use the DiskManagment GUI to Initialize and place the disks online by right clicking on eash Disk.
Image may be NSFW.
Clik here to view.
Alternatively you can use DiskPart to repeat the following operation on each disk:
select disk=<n>
attributes disk clear readonly
online disk noerr
convert mbr....
(reference: Initializing disks from command line or DISKPART in Win 2008? )
