Was just getting ready to add some more storage and thought I’d share this little table I found. As many of you know the block size you use when creating the VMFS will determine how big of files you can put in that storage area. This site has a nice little reference table.

• 1MB block size – 256GB maximum file size
• 2MB block size – 512GB maximum file size
• 4MB block size – 1024GB maximum file size
• 8MB block size – 2048GB maximum file size

VMware seems to have a 2TB limit for VMFS which also applies to raw device mappings (outlined here). So unless you want to use extents (god help you) you’re stuck with 2TB virtual disks.