RDM (Raw Device Mapping) supports more than 2TB in ESX 3.5, but not in vSphere (which is what I’m using). I was attempting to Extent the ESX datastore to 16TB (the limit is 64TB) but I still get the error associated with the 2TB limitation. Extenting the Datastore was the way to do this in 3.5.
Essentially, the RDM LUN size ability to be more than 2TB was a ‘bug’ and was fixed in vSphere.
The single host restriction of the Pro is a huge shame. My scenario is as follows:
I have a 16TB LUN provisioned and with a heap of stuff stored on it. I want to be able to grow to 16TB, so don’t want to sacrifice it.
I have limited storage in my ESX server and need to store a heap of VM’s. So I would like to be able to connect to the Drobo from ESX using iSCSI but still be able to present my 16TB LUN to my 2008R2 VM. It can’t be done, basically.
If I could present my iSCSI to more than 1 host - hey presto.
My only options (other than buying an Elite) are to break up that 16TB LUN in to 2TB LUN’s. Doing so would mean I would eventually have to split my data or use RAID in Windows - far from ideal. I guess the other option is ESXi rather than vSphere - but then I’ll be using an unsupported hypervisor.
What happens if you install the Elite firmware on a Pro?!