Combining External Storage Xp With Other Hp Storageworks Products - HP StorageWorks User Manual

significant concern, ensure that the external LU's Path Blockade Watch time is the same as or shorter
than the host command's timeout period.
• Host access to the external storage LU must be via the XP12000/XP10000, and must not be via a
direct physical connection to the external storage device LU. For external disk array LUs not involved
with External Storage XP, direct access from a host is allowed for all supported external storage except
MSA. If you use MSA as external storage, it must be entirely dedicate as external storage.
• For all external storage, either set the ES XP cache mode option in Command View XP or XP Remote
Web Console to cache disabled or partition resources associated with external storage in its own CLPR
(for example, CLPR1). While HP strongly recommends this new default for all external storage in
general, this new default is mandatory for any external disk array that is slower than an XP12000
external port (for example, the Modular Smart Array product line) unless it resides in its own CLPR
partition with isolated port/MP/cache resources.

Combining External Storage XP with other HP StorageWorks products

You can use HP StorageWorks software products to manage the external LUs you set using External
Storage XP.
The HP StorageWorks software products that support mapped external LUs are listed below. Configuration
examples are described in the following sections:
• "Using external LUs for Auto LUN XP
• "Using external LUs for Continuous Access XP
• "Using external LUs for Continuous Access XP Journal
• "Using external LUs for Business Copy XP
For operations and notes about each software product, see the product's user guide.
• LUN Manager
If you set an open-system emulation type when mapping the external LU, you must use LUN Manager to
set the mapped LU's path.
• Volume Manager
• If you set a mainframe-system emulation type when mapping the external LU, you must format the
mapped volume or perform the Write to Control Blocks operation using the Custom Volume Size
(CVS) function before putting the external LU into use. For instructions, see the HP StorageWorks
LUN Configuration and Security Manager XP user guide for the XP12000/XP10000.
• If you use the CVS function to create LDEVs from an external XP LU, the created LDEVs' attributes (IO
Suppression mode and Cache Mode) are the same as the source external LU's.
• You cannot combine the local disk array internal XP LDEV and external LU to form a LUSE volume.
• Do not combine LDEVs of multiple external arrays to create a LUSE volume. You can only use LDEVs
in the same external array to set LUSE volumes.
• You cannot combine external LUs that have different IO Suppression modes to form a LUSE volume.
• You cannot combine external LUs that have different Cache Mode settings to form a LUSE volume.
• Cache LUN XP
• You must set the IO Suppression mode to Disable to use the mapped external LU for Cache LUN XP
operations.
• You cannot specify Cache LUN XP's bind mode for an external LU that has Cache Mode set to
Disable.
• If you use the mapped external LU for a Cache LUN XP operation and set the bind mode, the Cache
LUN XP operation requires a cache that is twice the size of the user data.
• Continuous Access XP (sync and async)
You must set the IO Suppression mode to Disable to use the mapped external LU for Continuous Access
XP operations.
For a Continuous Access XP configuration example, see
operations" on page 40.
• TrueCopy for z/OS
operations" on page 39
operations" on page 40
operations" on page 41
operations" on page 42
"Using external LUs for Continuous Access XP
External Storage XP user guide 37