| Host System A |
| |
Host Attachment | Host Attachment | ||
WWPN | WWPN | WWPN | WWPN |
Host System B
Host Attachment
WWPN 
WWPN
Host System C | |
Host Attachment | |
WWPN | WWPN |
| 1 | 4 | 5 | 7 |
2 | 3 |
| 6 | 8 |
Volume Group 1 | Volume Group 2 | Volume Group 3 |
It is possible to have several Host Attachments associated to one Volume Group.
But we do recommend, for management
to associate only one Host attachment to each Volume Group
Figure 9-4 Example of Volume Group, LUNs and host attachment definition
In Figure
WWPN of each host system in groups called host attachments. As shown in the diagram, each host attachment is assigned to one volume group. Volumes can belong to several volume groups. For example, volumes 5 and 6 are in Volume Group 2 and Volume Group 3, so they will be shared by Host A, Host B and Host C. Several host attachments can be associated to the same volume group. For example, Hosts B and C will share volumes 5, 6, 7 and 8 because their host attachments are assigned to Volume Group 3. However, for management simplification, we recommend that only one host attachment is assigned to each volume group.
The maximum number of volume groups for the DS6000 is 1040.
Address groups
An address group is a group of FB or CKD LSSs. An address group has up to 16 LSSs. The DS6000 supports two address groups: address group 0 and address group 1.
LSS/LCU
A Logical Subsystem (LSS) is a topological construct that consists of a group of up to 256 logical volumes. A DS6000 can have up to 32 LSSs. The DS6000 supports a mix of
For zSeries hosts, a logical subsystem represents a logical control unit (LCU). Each control unit is associated with only one logical subsystem.
158DS6000 Series: Concepts and Architecture
