HP StorageWorks XP Remote Web Console Software - Manual (Page 7)

1 Overview of connecting external arrays
HP XP External Storage realizes the virtualization of storage arrays. You can use XP External Storage
to access multiple storage arrays connected by a Fibre Channel interface as if they were all one
storage array. Once you connect another storage array to an XP array or storage virtualization
system using XP External Storage, you can also use XP Command View Advanced Edition Software
or Remote Web Console to manage the data space (but not necessarily the management) of the
other storage arrays.
XP External Storage supports external storage LDEVs of any standard XP emulation type, such as
OPEN-3, OPEN-8, OPEN-9, OPEN-L, OPEN-K, OPEN-V, 3390-3, or 3390-0.
NOTE: Currently only the HP XP12000 and XP10000 Disk Arrays and the HP 200 Storage
Virtualization System (SVS200) support external storage.
In this user guide, the original XP12000/XP10000/SVS200 is called the local array and the
connected storage array is called the external array. The volume managed in the local array is
called an internal storage virtualizer LDEV (or internal LDEV), and the volume in an external array
is called an external LU.
IMPORTANT: This guide contains information about internal disks or LDEVs. Unlike the
XP12000/XP10000 Disk Arrays, the SVS200 has no internal disks. Therefore, information about
internal disks or LDEVs does not apply to the SVS200.
With the help of host mirroring middleware, HP XP Auto LUN Software or HP XP Tiered Storage
Manager, you can use XP External Storage Software for online or offline data migration, providing
a point-in-time copy of data between an external device and the local array.
HP XP Flex Copy is another HP product that copies user data between an LU on a local array and
an LU on an external storage device. For a detailed description of XP Flex Copy, see the HP Flex
Copy XP user guide.
XP External Storage features
The following are XP External Storage features:
•
Using XP External Storage to map an external LU as an internal LDEV, you can manage the
external LU capacity using XP Command View Advanced Edition Software or Remote Web
Console as if it were a volume in the local array.
Mapping means assigning Virtual Devices (VDEVs) and, consequently, Logical Devices (LDEVs)
and host port LUs to external LUs. If you map external LUs as internal VDEVs, you can use XP
Command View Advanced Edition Software or Remote Web Console to then assign the VDEV
to an internal CU:LDEV and a port/LU address. This allows you to use an external LU as if it
were an LDEV in the local array.
NOTE: The phrases mapped as an internal LU and mapped as an internal LDEV should be
interpreted to mean that the external LU is specifically mapped into the local array as a unique
VDEV (Virtual Device), which is then associated with a local array CU:LDEV (Control Unit:Logical
Device), which is then typically associated with a unique host port/LU combination. Since a
local array LU number is only unique within the name space of a host port (for example,
CL1-A), references to “XP LU” should be interpreted as references to either the unique port/LUN
combination or the unique CU:LDEV combination.
•
If you use XP Flex Copy with XP External Storage, you can copy data in the external array to
the local array and copy data in the local array to the external array. For more information
about XP Flex Copy, see the HP Flex Copy XP user guide.
XP External Storage features 7