VERITAS NetBackupTM 5.0, User Manual And Product Specifications

Page: 398 / 428

Media Requests for a TLH Robot
364 NetBackup Media Manager System Administrator’s Guide for Windows
Media Requests for a TLH Robot
A request for media in a TLH robot in an IBM Automated Tape Library begins in the same
manner as other media requests. The Media Manager device service (
ltid)
receives the
request and queries the Media Manager volume service
(vmd)
for the location of the
media. The volume service, in this case, returns only the robot number and type for the
TLH robot, since Media Manager does not manage slot information for media in a TLH
robot.
ltid
verifies that the type and density of the requested volume are compatible. Next,
ltid
checks its internal tables (these tables are based on the device databases) to
determine if there is an available drive and sends a mount request to the TLH process
(
tlhd)
. This process passes the request to the TLH control process (
tlhcd
).
Component Description
Media Manager Server This host has Media Manager software installed and acts as a
client to the Automated Tape Library through the IBM ATL
service. The Netbackup Device Manager service forwards mount
and dismount requests to the Tape Library Half-inch service
(
tlhd
).
Tape Library Half-inch process
(
tlhd
)
This process resides on a Media Manager server and passes
mount and dismount requests to the Tape Library Half-inch
control process (
tlhcd
) on the robotic control host.
Tape Library Half-inch control
process (
tlhcd
)
This process receives mount or dismount requests from
tlhd
, or
robot inventory requests through an external socket interface.
tlhcd
must reside on the same system that communicates with
the IBM ATL service.
IBM Automated Tape Library
service A component of IBM ATL support. This software handles all
communications with the Library Manager and must be running
on any system from which the Automatic Tape Library is directly
controlled.
Library Manager A component of IBM ATL support that provides control of the
robotics and robotic library. This is a PC that is usually located
within the robot cabinet.
IBM Automated Tape Library
(ATL) An IBM physical library under automated robotic control.