Software User Manual

External Storage XP user guide 139
If you search for logical volumes by specifying the WWN that indicates EVA Port A in the configuration,
such as in Figure 68, logical volumes named LUN 1 and LUN 2 are found for both HostGroup-1 and
HostGroup-2. In this case, two different logical volumes with the same name, such as LUN 1 and LUN 2,
are found as logical volumes that can be connected from EVA Port A, but you can only tell which LUN 1
and LUN 2 belong to HostGroup-1 or HostGroup-2 by examining the Characteristic field.
In the configuration in Figure 68, you can identify logical volumes by referring to Characteristic2 in
External Storage XP’s panes. The first 32 characters of Characteristic2 indicate the World Wide LUN
Name found on the EVA array. You can identify the EVA array’s logical volume by this World Wide LUN
Name.
Figure 68 Configuration example for which logical volumes can only be identified by characteristic
Alternate path’s behavior when an EVA array is connected
When an EVA array is connected, the alternate path’s behavior differs depending on the EVA array’s
microprogram version.
The alternate path’s behavior differs between EVA arrays of the microprogram version shown below and
EVA arrays of earlier microprogram versions:
• Array type: EVA3000/5000
microprogram version 4.000 or later
• Array type: EVA4000/6000/8000
microprogram version 5.031 or later
To replace the EVA array’s microprogram, check whether the alternate path’s behavior changes as a result
of changing the microprogram version. If the alternate path’s behavior changes, perform External Storage
XP’s Delete LU operation to release the setting for the EVA array volume’s mapping before you actually
replace the microprogram.
See the EVA array manuals for more information how the alternate path’s behavior changes.