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How to change blocksize (file size limit) on VMFS3 filesystem

If you are trying to create a VM with disk drive size larger than 256 you will get this error :

File is larger than the maximum size supported by datastore.

This happens because by default VMware ESX running VMFS3 uses 1M blocksize with a limitation of 256 GB disk size for the guest virtual machine. However it is possible to change the block size.

To changethe block size on a VMFS3 filesystem you can use vmkfstools command from command line ro reformat the parition. The vmkfstools command can be run on ESX server :

#vmkfstools –create vmfs3 –blocksize 2M vmhba1:0:0:2

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