HP StorageWorks XP Remote Web Console Software - Manual (Page 31)

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When a port in an external array connected to XP12000 Disk Array has a management LU
(for example, Universal Xport LU) that stores control information from a particular application,
note the following:
◦ A management LU cannot be used as an external volume. A management LU in this
document means an LU that receives commands issued by a particular application and
that controls or manages the application. A command device is not a management LU.
◦ Perform one of the following operations on the external array before you perform discovery
operation. If none of the following operations are performed, an external array that has
a management LU might not be recognized.
– Delete the management LU from the port connected to XP12000 Disk Array.
– Make sure that at least one LU is used for data storage and has a smaller LUN than
the LUN of the management LU. Also make sure that this LU is set to the port connected
to XP12000 Disk Array.
– Configure the access attribute of the management LU to prohibit read and write
operations by using security function.
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If you map an external LU that is more than 2 TB with the setting of OPEN-V emulation type,
you can access data stored in the field up to 2 TB. You cannot access data stored in the field
over 2 TB.
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When mapping a volume that has a capacity of 2 TB or less in the external array and (external
LU) with the OPEN-V emulation type, the LU is defined as an internal LDEV with the same
capacity as the mapped external LU. That is, no space is forfeited for management space,
and no formatting of that data occurs. Therefore, OPEN-V is recommended.
Figure 11 Example of external LU with 2 TB or less
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If you map an external LU that is equal to or greater than 575.98 GB with an OPEN emulation
type other than OPEN-V, you can access data stored in the field up to 575.98 GB. You cannot
access data stored in the field over 575.98 GB.
However, for emulation types with a small base capacity, some of the field of 575.98 GB
might not be available. For more information, see
“Required volume capacity for emulation
types” (page 160) .
•
If you map an external LU that is equal to or greater than 575.98 GB with a 3380 mainframe
emulation type, you can access data stored in the field up to 575.98 GB. You cannot access
data stored in the field over 575.98 GB.
However, for emulation types with a small base capacity, some of the field of 575.98 GB
might not be available. For more information, see
“Required volume capacity for emulation
types” (page 160) .
Limitations on XP External Storage operations 31