
76 IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
To create the DS6000 logical volume, also known as a Logical Unit or LUN, extents from the
selected Extent Pool are concatenated to allocate the required LUN capacity. If an Extent
Pool is made up of several Ranks, a LUN can potentially have extents on different Ranks and
so be spread over those Ranks.
However, to be able to create very large logical volumes, you must consider having Extent
Pools that span more than one Rank.
Combining Extent Pools made up from one Rank and then utilizing an open systems
host-based Logical Volume Manager (LVM) to stripe a host Logical Volume ...