User Guide

100 DS8000 Series: Concepts and Architecture
Figure 5-13 Optimal placement of data
5.4 Benefits of virtualization
The DS8000 physical and logical architecture defines new standards for enterprise storage
virtualization. The main benefits of the virtualization layers are:
򐂰 Flexible LSS definition allows maximization/optimization of the number of devices per
LSS.
򐂰 No strict relationship between RAID ranks and LSSs.
򐂰 No connection of LSS performance to underlying storage.
򐂰 Number of LSSs can be defined based upon device number requirements:
– With larger devices significantly fewer LSSs might be used.
– Volumes for a particular application can be kept in a single LSS.
– Smaller LSSs can be defined if required (for systems/applications requiring less
storage).
– Test systems can have their own LSSs with fewer volumes than production systems.
򐂰 Increased number of logical volumes:
– Up to 65280 (CKD)
– Up to 65280 (FB)
– 65280 total for CKD + FB
Server0 Server1
Extent Pool FB-0c
Extent Pool FB-1a
Extent Pool FB-0a
Extent Pool FB-1c
DA pair 1
DA pair 1
DA pair 2
DA pair 2
Host LVM volume
Extent Pool FB-1bExtent Pool FB-0b
Extent Pool FB-0d Extent Pool FB-1d
Loop 1
Loop 2 Loop 2
Loop 1
LSS 00 LSS 01