Chapter 1 Overview
1.3 Functions
ETERNUS DX60/DX80/DX90 Disk storage system User Guide
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Copyright 2011 FUJITSU LIMITED
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Host Affinity function
The Host Affinity function sets the "Affinity Group" to be applied for each server. "Affinity
Group" defines the relationship between the host logical units (LUN) and the device logical
volumes. Multiple settings are available.
The Host Affinity function uses the server's World Wide Name (WWN), iSCSI name, or SAS
address to distinguish it from other servers.
Figure 1.18 Host Affinity function
When multiple servers access the device using the same port, this assigns Affinity Group for
each server.
Server A
WWN#A
LUN#0
:
LUN#127
Server B
WWN#B
LUN#0
:
LUN#127
Server C
WWN#C
LUN#0
:
LUN#127
Switch
Apply Affinity Group #00 for the access from
WWN#A (=Server A) and WWN#B (=Server B)
Apply Affinity Group #01 for the access from
WWN#C (=Server C)
ETERNUS DX60/DX80/DX90
Volume#0
:
Volume#127
LUN#0
:
LUN#127
Affinity Group #00
Affinity Group #01
Volume#128
:
Volume#255
LUN#0
:
LUN#127
Port
Port
Restrict the server
that can be accessed
per port