Xp external storage operations – HP XP External Storage Software User Manual
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local storage system. After the mapping, you can manipulate the external volume from the local
storage system in the same way as manipulating an internal volume.
When external volumes in external storage systems are mapped as internal volumes in your storage
systems, the external volumes can be accessed and copied by hosts connecting to your storage
systems, but not by hosts connecting to the external storage systems.
This document sometimes uses the term external volume or mapped external volume to mention an
internal volume where an external volume is mapped (see B in
), because this
internal volume is a virtual representation of an external volume.
When you perform mapping, a path is automatically created between an internal volume and an
external volume. This path is called a mapping path, which connects one volume with another
volume. A cross-subsystem path is a part of a mapping path.
To use the external volumes that you mapped as an internal volume (see B in
- from the host or other program products, the system administrator needs to create LDEVs in the
external volume (see A in
). To create LDEVs, use XP External Storage at the
time of mapping, or use the Virtual LVI/LUN (VLL) function on the internal volume where an external
volume is mapped after mapping. The LDEVs created by these methods are called LDEVs in the
external volume in this document. These LDEVs are usually called external volumes in other
documents.
An external volume corresponds to a VLL VDEV (Virtual Device). An LDEV in the external volume
corresponds to a VLL LDEV. Therefore, you can use the VLL function to create custom-sized volumes
in an external volume after mapping, in the same way as creating custom-sized volumes in the
normal internal volumes. For details on VDEVs and LDEVs, see the HP StorageWorks
XP24000/XP20000 Virtual LVI/LUN (VLL) and Volume Shredder User Guide.
XP External Storage Operations
Use XP External Storage to execute the following operations.
•
Preparing to use external volumes
You can map external volumes, set port attributes, and set cross-subsystem paths. For details,
see
“Configuring XP External Storage” (page 16)
and
“Overview of Setting Operations”
.
•
Preparing to manipulate the power supply of the storage systems
You must follow specific procedures to manipulate the power supply of the storage systems
when external volumes are used. To turn on or off the power supply of the external storage
system after starting to use the external volumes, you need to execute the commands of XP
External Storage. For details, see
“Turning On or Off the Storage System” (page 88)
.
•
Setting up and removing the cross-subsystem paths
When you set up or remove the path (cable) connecting the storage systems, you need to use
XP External Storage to make settings on the path. For details on removal, see
External Storage System or Disconnecting External Volume” (page 91)
and
Connection Status and Resuming External Volume Operation” (page 93)
. For details on setup,
see
“Configuring the Cross-subsystem Path” (page 81)
.
•
Referring to the status of external volumes
You can see the status and the configuration of external volumes. For details, see
the External Volume Details” (page 85)
.
•
Stopping the use of external volumes
You can cancel mapping of external volumes. For details, see
Mapping (Delete Volume Command)” (page 99)
.
XP External Storage Operations
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