HP XP External Storage Software - Manual (Page 24)

For instructions, see the HP StorageWorks Command View XP user guide for XP Disk Arrays or the
HP StorageWorks XP Remote Web Console user guide for XP12000/XP10000/SVS200.
Preparing for External Storage XP settings
Before using External Storage XP, collect the information necessary for defining its settings. The
following information is required:
• Ports that can be set to external ports (see External ports )
• External array and LUs to map to the internal LDEVs (see External LU to be mapped )
• Configuration of external LU groups (see External LU groups )
• Configuration of external LU attributes (see External LU attributes set by mapping )
• Configuration of alternate paths (see Alternate paths )
External ports
Local array ports used for External Storage XP must be set to a designation of External. When the
external array is connected to the local array's external port via Fibre Channel, you can view
information about the external array from Command View XP or XP Remote Web Console. The external
array can be connected only to ports designated as External.
To set the port attribute to External, you must release any existing paths currently configured for the
port. You cannot change the attribute of the port where paths are set to External. Before starting
External Storage XP operations, you must know which ports you can change to External.
NOTE:
You cannot use ports with attributes set for remote copy software (such as RCU Target or Initiator) or other
features as external ports for External Storage XP. If the port attribute is set to something other than External,
change its attribute to External. Flex Copy XP and External Storage XP can share an
XP12000/XP10000/SVS200 port with an attribute of External.
For instructions, see Setting a local array's port attributes .
External LU to be mapped
When connecting an external array to an external port, you can map LUs in the external array (external
LUs) as LDEVs in the local array (internal LDEVs). Verify which LUs in which external array can be
mapped as internal LDEVs.
You can map only one external LU to a given internal LDEV and map up to a theoretical limit of 1,024
external LUs per local array port.
An external LU's maximum available capacity depends on the emulation type set when the LU is
mapped. You cannot access data stored in the field over the external LU's maximum available capacity.
To set an emulation type other than OPEN-V, you cannot map external LUs smaller than 38 MB
(77,760 blocks). To set the OPEN-V emulation type, you cannot map external LUs of smaller than
47 MB (96,000 blocks). For more information about the capacity of the external LU for each emulation
type, see
Required volume capacity for emulation types .
Preparing for External Storage XP operations 24