system that is not connected to the local host. A dummy device number must be allocated to the
disk configuration information acquired from the remote scan by using Business Continuity Manager.
“Remote Scan in a 3DC Cascade Configuration” (page 91) shows an operational image of the
remote scan function for a 3DC Cascade configuration. In this example, Business Continuity
Manager at the primary site performs a remote scan to acquire the disk configuration information
at an intermediate site without a channel connection.
Figure 53 Remote Scan in a 3DC Cascade Configuration
NOTE: You cannot check if the capacities of P-VOLs and S-VOLs are the same when defining
copy groups because volume capacity is not acquired by a Remote Scan. Therefore, define copy
pairs so that the capacities of the P-VOLs and S-VOLs are the same.
NG Scan
The volumes on a storage system that is directly connected to a host (volumes that are not defined
in the operating system I/O configuration definitions and that the OS does not recognize) are
called Non Gen’ed volumes.
To acquire disk configuration information about Non Gen'ed volumes and define a copy group
for the volumes, perform a function called an NG scan.
The disk configuration information acquired by an NG scan does not have device numbers (DEVN)
that are host attributes, because the information is not defined in the operating system I/O
configuration definitions. Therefore, a dummy device number must be allocated to the disk
configuration information acquired from the NG scan by using Business Continuity Manager.
Functions that Acquire Volume Information 91
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