IBM DS8800, Introduction And Planning Manual, Page: 91 / 256

The storage management software can be used in real-time mode. When you are
connected to storage devices over your network, you can use the Real-time
Manager to manage your hardware or configure your storage.
I/O Priority Manager
The performance group attribute associates the logical volume with a performance
group object. Each performance group has an associated performance policy which
determines how the I/O Priority Manager processes I/O operations for the logical
volume.
Disk
Array Site
Array
Rank
Extents
= CKD Mod1 Extent in IBM
System z environments
= FB 1GB in an Open
systems Host
Vir tua liz at ion
Extent Pool
Extents
Logical Volume
Volume Group
Volume Groups
Map Hosts to
Volumes
f2d00137
Figure 16. Logical configuration sequence
Chapter 3. Data management features
69