
62 DS8800 Performance Monitoring and Tuning
required to assign each pair of FB pools and CKD pools to both storage servers, balancing
capacity and workload across both DS8000 processor complexes. Figure 3-4 is an example
of a mixed environment with CKD and FB extent pools. Additional extent pools might be
desirable to segregate workloads.
Extent pools are expanded by adding more ranks to the pool. Ranks are organized in two
rank groups: Rank group 0 is controlled by storage server 0 (processor complex 0), and rank
group 1 is controlled by storage server 1 (processor complex 1).
Figure 3-4 Extent pools
Dynamic extent pool merge
Dynamic extent pool ...