About Virtual Products : About flexible data stores
  
About flexible data stores
The flexible data store feature supports a smaller data store size, down to a minimum 12 GB.
To change the disk size or add disks, you’ll need to power off the host virtual machine, and then detach the data store disk and attach a new, smaller one. Simply attempting to reduce the size of the existing disk will not work.
Modifying the disk size causes the data store to automatically clear.
If you provide a disk size larger than the configured data store for the model, the entire disk is partitioned, but only the allotted amount for the model is used.
SteelHead-v models VCX70 through VCX110 support multiple data stores using Fault Tolerant Storage (FTS). We recommend that all data stores on an appliance be the same size.
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