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What are the limitations for VMFS-5?
VMFS-5 limits the number of extents to 32 and the total datastore size to 64TB, but the individual extents are not limited to 2TB each. For example, you can create a datastore with a LUN size of 64TB, or one with up to 32 extents up to maximum size of 64TB.
Only pass-through RDMs (Raw Device Mapping) can be created with a size >2TB. Non-pass-through RDMs and virtual disk files are still limited to 512B ~ 2TB.
Passthrough RDMs are supported up to ~60TB in size.
Both upgraded and newly-created VMFS-5 volumes supported the larger Passthrough RDM size.
Non-passthrough RDMs are still limited to 2TB minus 512B.