HP 3PAR Application Software Suite for VMware - Manual (Page 63)

Figure 49 Datastore Parameters Review
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VMFS-5/VMFS-3 option and Block Size - Specifies whether to use VMFS or VMFS-3. You
can optionally specify the block size. VMFS-5 is only valid for ESXi 5.0 or above hosts.
•
Size (512 MB – 16 TB) - Size for the virtual volume. For VMFS-3, the VV size range is 512
MB to 2 TB, For VMFS-5, the VV size range is from 512 MB to 16 TB.
When specifying the size for a virtual volume, 256 MB is reserved for each node.
Depending on the cluster type, the minimum virtual volume size is calculated as 256 MB
times the number of nodes.
In a two node system, 512 MB is reserved when a TPVV is created. If an 80% user limit
is set for a 512 MB TPVV, only 410 MB of space can be allocated. However 512 MB
is the least amount required so the creation of the virtual volume fails. In other words, If
the allocation limit is set, the space after the % needs to be at least 512 MB in a 2 node
cluster.
VV growth increment is 256 MB (i.e., If 520 MB is selected for a virtual volume, a VV
size of 768 MB is automatically created.
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Create raw disk only - Creates a raw disk when checked. By default, this option is not
checked and a Datastore is automatically created. You can attach the disk to a Virtual
Machine and choose either Physical or Virtual compatibility mode.
Creating Virtual Volumes and Datastores 63