Enterprise Modular Library E-Series user guide 23
Functional description
The EML receives commands and data throughout the SAN from hosts running applications from
approved independent software vendors (ISVs). This traffic is sent to interface controllers over FC links
from host bus adapters installed on the host systems. FC switches most likely route this host traffic to the
library (see Figure 13). One interface controller is assigned to a maximum of four tape drives. The
interface controllers route read and write commands over Fibre Channel to the tape drives, and medium
changer commands to the Interface Manager card, which passes these on to the library robotics
controller over Ethernet.
Figure 13 EML network
In addition to receiving traffic from the interface controllers, the Interface Manager card receives
command and diagnostic requests over an Ethernet connection from three other possible sources. The
majority of requests come from a management station where Command View TL software resides. Other
sources can be through a Telnet session or serially over an RS232 interface. The Interface Manager card
works in the background to manage library functions. It configures the interface controllers to direct
commands from host systems to the appropriate tape drive or to the robotics controller.
The library robotics controller receives commands over an internal Ethernet network and from the OCP. It
manages robotics movement, monitors the door and load port sensor status, and stores library
information in volatile memory.
A functional description of the components and software that make up the EML is described next.
1 Hosts
2 Fibre Channel switch
3 e2400-FC 2G interface controller (up to 4)
4 Interface Manager card
5 HP Ultrium tape drives (up to 16)
6 Library robotics controller
7 Robot
8 Operator control panel
9 Serial connection
10 Telnet connection
11 Management station
12 Library boundary
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