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5–16 CLI Commands
ADD PASSTHROUGH
Creates a passthrough container. A passthrough container bypasses controller
processing and allows the host to have direct access to the device. A passthrough
device appears as if it were connected directly to the host bus rather than to the
controller. Use passthrough containers to communicate with tape devices and tape
loaders because they do not require the controller for optimum operation
performance.
Passthrough units can be created for passthrough Command Console LUNs to allow
SWCC to configure and monitor the controllers and devices on the backend in a
remote mirroring implementation. The passthrough devices are automatically
configured by the controller if they exist. The unit above the passthrough is not
automatically configured by the controller.
Syntax
ADD PASSTHROUGH passthrough-name scsi-port-target-lun
Parameter
Names the device being added to or changed in a subsystem configuration. This is the
same name used with the ADD UNIT command to create a host-addressable unit. You
may want to use a name indicating the type of device is being added as a passthrough
container, such as TAPE or LOADER.
The container name must start with a letter (A through Z) and may consist of a
maximum of nine characters including letters A through Z, numbers 0 through 9,
periods (.), dashes (-), or underscores (_).
IMPORTANT: It is common to name a tape passthrough device TAPE
pttll
, where
pttll
is the tape’s Port-Target-LUN address. Although other naming conventions
are acceptable, this naming convention offers the advantage of presenting to the
user both the type of device and its SCSI location in an intuitive manner.