Summary of the virtualization hierarchy

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Summary of the virtualization hierarchy

Going through the virtualization hierarchy, we started with just a bunch of disks that were grouped in array sites. An array site was transformed into an array, eventually with spare disks. The array was further transformed into a rank with extents formatted for FB data or CKD. Next, the extents were added to an extent pool that determined which storage server would serve the ranks and aggregated the extents of all ranks in the extent pool for subsequent allocation to one or more logical volumes.
Next, we created logical volumes within the extent pools, assigning them a logical volume number that determined which logical subsystem they would be associated with and which server would manage them. Then the LUNs could be assigned to one or more volume groups. Finally, the host HBAs were configured into a host attachment that is associated with a given volume group.
This new virtualization concept provides for much more flexibility. Logical volumes can dynamically be created and deleted. They can be grouped logically to simplify storage management. Large LUNs and CKD volumes reduce the total number of volumes, and this also contributes to a reduction of the management effort.




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