Quantum atl m1500 User Guide

Chapter 1  Overview
Tape Drives

2

ATL M-Series User’s Guide

Tape Drives

1

M-Series tape libraries are equipped with SCSI tape drives. One SCSI bus 

is provided for the library robotics and for each SCSI tape drive installed. 

These SCSI buses are SCSI-2 fast/wide (8/16 bit), Ultra SCSI, Ultra 2 

SCSI, Ultra 3 SCSI, or Ultra 160 SCSI, depending on the drives installed.
LVD SCSI configurations have a maximum allowable bus length of 12 

meters. To determine the cable length of the bus, measure the lengths of 

the SCSI cables connecting each device to that bus and add those lengths 

together. To that total length, add 12.25 inches (31.10 cm) for the internal 

SCSI cable length of each SCSI tape drive.

Library Scalability

1

The ATL M1500 and ATL M2500 library modules can be used as stand-

alone libraries, or can be combined with other ATL M1500 and 

ATL M2500 library modules and a StackLink mechanism in a standard 

19-inch rack to form a larger library system (called a multiple library 

stack). The multiple library stack appears as a single large capacity library 

to the host.
The StackLink mechanism connects the library modules in the multiple 

library stack and transports cartridges from module to module. Each tape 

drive has access to all the tape cartridges in the stack.
Once the StackLink mechanism is installed in the rack, you can add 

library modules simply by sliding them into place and making the 

necessary electrical connections.

 lists the capacities of all the sizes of multiple library stack you can 

create using ATL M1500 library modules. 

 lists the capacities of all 

the sizes of multiple library stack you can create using ATL M2500 library 

modules. You can obtain different capacities by combining ATL M1500 

and ATL M2500 library modules in a multiple library stack.