HP StorageWorks MSL6000 series tape library user guide (231910-009, February 2008)

MSL6000 series tape library user guide 27

Figure 9 Library front panel

Multi Unit Library Systems

MSL Series tape libraries can be stacked in a scalable combination with additional two-drive and

four-drive models to form a multi unit library configuration. Through use of a rear-mounted

Pass-Through Mechanism (PTM), all libraries in a multi unit library configuration can operate

together as a single virtual library system. Stacked libraries are interconnected through their rear

panel Ethernet connections to a supplied LAN hub that mounts to the rack enclosure. The LAN hub

also provides a wide area network (WAN) connector when libraries are combined in their

maximum stacked height.

A maximum of four four-drive models or eight two-drive models can be connected together in this

manner. Any combination of libraries, not exceeding 40 Units (40U) in total stacked height, can

also be used. A multi unit library configuration appears as a single library to the host computer

system and application software. For multi unit applications, the top library becomes the master unit

and all other libraries are slave units.

WARNING! The PTM continues to function each time a slave library is physically removed from the

rack enclosure configuration during normal library operation. Refer to the HP StorageWorks MSL

Series Pass-Through Mechanism Reference Guide for detailed installation, configuration, and

operation information

The library robotics can pick and place tape cartridges into a movable elevator that encompasses

the full length of the PTM. In this manner, individual tapes can be passed up or down between the

libraries contained in the multi unit library configuration under the master library control. Robotics

1 Viewing Window

2 GUI Touch Screen

3 Library Status LED