Ng scan, Volumes used for ng scans – HP XP Racks User Manual
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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.
An NG scan can be performed on XP12000/XP10000, XP24000/XP20000, XP P9500, and
XP7 storage systems.
Volumes used for NG scans
The NG scan uses either a command device or the volume from which disk configuration information
was acquired by a local scan (the first volume in the disk configuration definition file) to acquire
information from the volumes that the OS does not recognize. If you use a command device, set
up a command device and route list before executing an NG scan.
and
show operational images of the NG scan using a
command device or the local scanned volume. The following legend applies to each of these
figures.
shows an operational image of an NG scan when using a command device.
Figure 61 Operational image of an NG scan when a command device is used
is an operational image of an NG scan when a locally scanned volume is
used.
108 Understanding Business Continuity Manager functions