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One virtual SCSI client adapter in the client partition
This virtual SCSI adapter pair allows the client partition to send read and write I/O operations to
the host partition. More than one virtual SCSI pair can exist for the same client partition in this
environment. To minimize performance overhead on the host partition, the virtual SCSI
connection is used to send I/O requests, but not for the actual transfer of data. Using the
capability of the Power Hypervisor for Logical Remote Direct Memory Access (LRDMA), data are
transferred directly from the physical adapter assigned to the host partition to a buffer in memory
of the client partition.
There is no additional configuration required in IBM i in the virtual client partition. In the host
partition, the minimum required IBM i setup consists of the following:
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One Network Server Description (NWSD) object
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One Network Server Storage Space (NWSSTG) object
The NWSD object associates a virtual SCSI server adapter in IBM i (which in turn is connected to
a virtual SCSI client adapter in the HMC) with one or more NWSSTG objects. At least one
NWSD object must be created in the host for each client, though more are supported.
The NWSSTG objects are the virtual disks provided to the client IBM i partition. They are created
from available physical storage in the host partition. In the client, they are recognized and
managed as standard DDxx disk devices (with a different type and model). The following
screenshot shows several storage spaces for a client partition in an IBM i 6.1 host partition:
The next screenshot shows several storage spaces in an IBM i 6.1 client partition:
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