text: – Shared storage (volumes presented to more than one host) that is required in your 
  environment. 
  
  (cid:2) Define the amount of internal storage that you plan to provision from internal arrays. 
  Consider the following information: 
  
  – Amount of storage in each drive tier that you plan to deploy. 
  
  – The number of drives that you must provision the required storage. Consider RAID 
  
  levels, number of drives per array, and hot spares for each tier. Define the number of 
  drives and their form factor. 
  
  **Note:**Use DRAID 6 as the default RAID level for your arrays. 
  
  – The number of expansion enclosures you must hold the drives required to provision the 
  required storage. 
  
  (cid:2) Per host: 
  
  – Volume capacity. 
  – Logical unit number (LUN) quantity. 
  – Volume sizes. 
  
  **Note:**When planning the capacities, note if the numbers state the net storage capacity 
  (that is, available to be used by applications running on any host), or gross capacity, 
  which includes overhead for spare drives (both because of RAID redundancy and 
  planned hot spare drives) and for file system metadata. 
  
  For file system metadata, include overhead incurred by all layers of storage 
  virtualization. In particular, if you plan storage for virtual machines whose drives are 
  actualized as files on a parallel file system, include metadata overhead for the storage 
  virtualization technology that is used by your hypervisor software. 