Mover - IBM Hub/Switch Installation Manual

Chapter 2 HPSS Planning
2.6.9.2 LTO PVR
The LTO PVR manages the IBM 3584 Tape Library and Robot, which mounts, dismounts and
manges LTO tape cartridges and IBM 3580 tape drives. The PVR uses the Atape driver interface to
issue SCSI commands to the library.
The SCSI control path to the library controller device (/dev/smc*) is shared with the first drive in
the library (typically /dev/rmt0). Since the PVR communicates directly to the library via the Atape
interface, the PVR must be installed on the same node that is attached to the library.
The LTO PVR operates synchronously, that is, once a request is made to the 3584 library, the request
thread does not regain control until the operation has completed or terminated. This means that
other requests must wait on an operation to complete before the PVR can issue them to the 3584.
2.6.9.3 3494/3495 PVR
The 3494/3495 PVR can manage any IBM tape robot—3494 or 3495, BMUX, Ethernet, or TTY
attached. The PVR will create a process to receive asynchronous notifications from the robot.
At least one PVR should be created for every robot managed by HPSS. If multiple 3494/3495 robots
are managed, the PVRs must be configured to communicate with the correct /dev/lmcp device. The
PVRs can run on the same CPU or different CPUs as long as the proper /dev/lmcp devices are
available.
2.6.9.4 AML PVR
The AML PVR can manage ADIC AML robots that use Distributed AML Server (DAS) software.
The DAS AML Client Interface (ACI) operates synchronously, that is, once a request is made to the
AML, the request process does not regain control until the operation has completed or terminated.
Therefore, the AML PVR must create a process for each service request sent to the DAS (such as
mount, dismount, eject a tape, etc.).
2.6.9.5 Operator PVR
The Operator PVR simply displays mount requests for manually mounted drives. The mount
requests are displayed on the appropriate SSM screen
All of the drives in a single Operator PVR must be of the same type. Multiple operator PVRs can be
configured without any additional considerations.

2.6.10 Mover

The Mover configuration will be largely dictated by the hardware configuration of the HPSS
system. Each Mover can handle both disk and tape devices and must run on the node to which the
storage devices are attached. The Mover is also capable of supporting multiple data transfer
mechanisms for sending data to or receiving data from HPSS clients (e.g., TCP/IP and shared
memory).
72 September 2002 HPSS Installation Guide
Release 4.5, Revision 2