The host affinity can be set by associating "Host Groups", "CA Port Groups", and "LUN Groups".
Figure 44 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 that access the same LUN group.
HBAs in multiple hosts can be configured in a single host group.
● CA Port Group
A CA port group is a group of the same CA type ports that are connected to a specific host 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 multi-
ple host groups.
● LUN Group
A LUN group is a group of LUNs that can be recognized by the host and the LUN group can be accessed from the
same host group and CA port groups.
A LUN group is mapping information for LUNs and volumes.
•
Host access must be prevented 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.
1. Function
Improving Host Connectivity
77
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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