VERITAS NetBackupTM 5.0, User Manual And Product Specifications

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Media Requests Involving a TLM Robot
374 NetBackup Media Manager System Administrator’s Guide for Windows
Media Requests Involving a TLM Robot
A request for media in a TLM robot 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 TLM robot. The Media Manager volume
database does not manage slot information for media in a TLM 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 TLM process,
tlmd
. This process passes the request to the DAS/SDLC server software (which resides in
the Archive Management Unit).
The DAS/SDLC server locates the media and directs the robotics to mount the media in
the drive. When the host (where Media Manager is installed) receives a success response
from the DAS/SDLC server, it allows the requesting application (for example,
NetBackup) to start sending data to the drive.
Component Description
Media Manager Server A host that has Media Manager software and acts as a client
to the DAS/SDLC server.
Netbackup Device Manager service forwards mount and
dismount requests to the TLM service (
tlmd
).
TLM process (
tlmd
) This process passes mount and dismount requests to the
DAS/SDLC server and handles return status.
tlmd
also
receives and handles robot inventory requests.
Archive Management Unit (AMU) A PC running an IBM OS/2, Windows NT, or Windows 2000
operating system, usually located in or near the AML cabinet.
The ADIC software runs on the AMU.
Distributed AML Server (DAS)
Scalar Distributed Library
Controller (SDLC)
These are client/server software products that reside in the
Archive Management Unit and provide shared access to the
family of ADIC Automated Media Libraries (AML).
The Media Manager robotic process (or TLM process) acts as
a client to the DAS/SDLC server.
Automated Media Library (AML) An ADIC multimedia robotic library.