HP XP P9500 Storage - Manual (Page 22)

4 Prerequisites
This chapter describes the requirements and preparations for External Storage operations.
Configuring External Storage
Before configuring the External Storage settings, answer the following:
•
Which ports can be connected to external storage systems? See “Choosing external port”
(page 22) .
•
Which external storage system and volumes should be mapped as the internal virtual volumes?
See
“Choosing and mapping external volumes” (page 22) .
•
How will you configure external volume groups? See “Registering a volume to an external
volume group (ExG) ” (page 23) .
•
What external volume attributes will be configured? See “Configuring external volume
attributes” (page 23) .
•
How will you configure external paths? See “External paths ” (page 24) .
•
How will you make volumes usable from the local storage system? See “Connecting mainframe
volumes” (page 30) and “Connecting open systems volumes” (page 30) .
Choosing external port
The port used for External Storage must be set as an external port. When the external storage
system is connected to the external port of the local storage system, you can view the information
on the external storage system from the Remote Web Console computer. The external storage
system cannot be connected to the ports other than external ports.
In order to set the port attribute to external, the LU paths set to the port must be released. The
attribute of the port where the LU paths are already set cannot be changed to external. Therefore,
you must identify ports whose attributes can be changed to external before starting the External
Storage operations.
NOTE: The ports whose attributes are set for remote copy software (for example, RCU target,
initiator) or other features cannot be used as external ports for External Storage. In addition, change
the port attribute to external if the port attribute is set to anything other than external.
Choosing and mapping external volumes
When connecting an external storage system to an external port, volumes in the external storage
system (external volumes) become available for mapping as volumes in the local storage system
(internal virtual volumes). Identify the volumes in each external storage system that should be
mapped as internal virtual volumes.
You cannot access the data that is stored in an external volume beyond the maximum
available capacity.
As an example, if you virtualize an external100 GB volume and allocate 70 GB of it as a P9500
LDEV, the other 30 GB is available to create other P9500 LDEVs, but the 30 GB cannot be accessed
as the 70 GB LDEV that you created first.
The largest usable external OPEN-V volume capacity that is usable to provision as mainframe 3390
volumes is 695 GB. For example, if you map a 1 TB external OPEN-V volume approximately 300
GB of the volume will remain unusable.
22 Prerequisites