Figure 40
Associating Host Groups, CA Port Groups, and LUN Groups
Server A
Server B
Server C
Server D
Switch
Switch
Switch
Switch
ETERNUS AF
Host group 1
LUN group 1
Host group 2
CA port group 1
CA port group 2
LUN group 2
HBA
HBA
HBA
HBA
HBA
HBA
HBA
HBA
Port
Port
Port
Port
Vol#0
Vol#1
Vol#2
Vol#10
Vol#11
The host affinity can also be set by directly specifying the host and the CA port without creating host groups and
CA port groups.
●
Host Group
A host group is a group of hosts that have the same host interface type and are allowed to access the same
LUN group. HBAs in multiple hosts can be configured in a single host group.
●
CA Port Group
A CA group is a group of host interface ports that have the same CA type and are allowed to access the LUN
group. A CA port group is configured with ports that access the same LUN group, such as ports that are used
for multipath connection to the server or for connecting to the cluster configuring server. A single CA port
group can be connected to multiple host groups.
●
LUN Group
A LUN group is a group of volumes that can be accessed from the host and the LUN group can be accessed
from the same host group and CA port groups.
A LUN group is a mapping of host LUNs and volumes.
Caution
•
Host access must be stopped when changing or deleting already set host affinity settings. When
adding a new LUN to the host affinity settings, it is not necessary to stop host access.
•
When servers are duplicated and connected using a cluster configuration to share a single ETERNUS
AF among multiple servers, cluster control software is required.
2. Basic Functions
Improving Host Connectivity
81
Design Guide
Summary of Contents for ETERNUS AF S3 Series
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