Library Monitoring
1-14 StorageTek SL8500 Library Guide
also helps reduce contention and improve performance of the library and tape
drives. See "Multi TCP/IP Overview" on page F-1.
■ Redundant Electronics (RE) provides redundant library control and
communications, and protects against failure should the active HBC/HBCR card
fail or if communication to the card is lost. See "Redundant Electronics Overview"
on page D-1.
Switched Fabric Topology
In a switched fabric topology, all nodes on the storage area network connect to Fibre
Channel switches that provide optimized, dynamic interconnections between nodes.
When an SL8500 library is connected to a Fibre Channel switch or fabric-capable host,
it automatically configures itself for switched topology. This configuration can support
up to 16 million ports on the fabric.
To configure library-attached drives on an SL8500 library, you must use a switched
fabric topology. The SL8500 library does not support tape drives configured in
arbitrated loops.
Port Bonding
Port bonding combines multiple ports to create redundancy. The SL8500 library uses
an active-backup mode. In active-backup mode, there is one bond with two slave
ethernet interfaces. If the active interface fails, the backup interface becomes active.
With minimum library firmware 8.31 and a second Ethernet switch installed in the
library, port bonding is automatically enabled—no command or activation file is
required.
Dynamic World Wide Name
The SL8500 library uses the dynamic World Wide Name (dWWN) feature. When
enabled, dWWN assigns world wide names to the library drive slots rather than the
drives themselves. Therefore, when a drive is replaced, it is assigned the same WWN
as the drive it replaced, preventing reconfiguration of the network. Both library and
tape drives must have microcode or firmware that supports the dWWN feature.
With the dWWN feature enabled, tape drives do not keep their original WWNs when
they are migrated between libraries. A drive that was previously known to the SAN
under its own, drive-specific WWN will no longer be recognized. Therefore, you
should configure all drive bay slots in the library and verify that the tape drive data
path is bound correctly over the SAN.
Library Monitoring
The library can be monitored using SLC or Simple Network Management Protocol
(SNMP). Additionally, service representatives can use the Log SnapShot feature to
collect logs from the controller cards.
StorageTek Library Console (SLC)
SLC is a GUI application for configuring, monitoring, and managing the SL8500
library. SLC is included with the purchase of an SL8500 library. You can access SLC
from the local operator panel, a stand-alone version on a workstation, or through a
browser. For installation requirements and additional information, see "Installing
StorageTek Library Console" on page 3-1.
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