Is Spanning VMDKs Using Windows Dynamic Disks a Good Idea?

I've had several folks ask me recently about how to support very large NTFS volumes on vSphere virtualized Windows servers.  The current limitation for a VMDK in vSphere 5.1 is 2TB minus 512B.  FWIW, a Hyper-V virtual disk in Windows Server 2012 can be up to 64TB.  Those asking the question want to support NTFS volumes greater than 2TB for a variety of purposes - Exchange databases, SQL databases, and file shares.  Windows (depending on the version and edition) can theoretically support NTFS volumes up to 256TB (depending on cluster size and assuming GPT), with files up to 256TB in size (see … [Read more...]