Chapter 4 Configuring Your Library
Configuring Devices
Scalar i2000 User’s Guide 157
FC Host 4
The FC Host command enables you to manually modify host information
and set LUN mappings.
During device discovery, a particular partition or drive could map to a
higher LUN space than is optimal for a particular application. The FC Host
command enables you to create a virtual private remapping of available
LUNs for a specific Fibre Channel-attached host. LUN mapping is
required to give hosts access to partitions and devices. You also can make
devices appear to the host as if they were at lower LUNs in order to
optimize system performance.
Depending on host operating system constraints, it might be necessary to
reboot or reconfigure the host because of device map changes that result
from using the FC Host command.
As an option, you can install HRS on the host(s). With HRS, you do not
need to input host information, and you get the benefits of host-side data
path conditioning. To install HRS on a host, see
Installing the Host
Registration Service on page 201.
Accessing FC Hosts 4
1 Log on as an administrator.
2 Make sure that you are viewing the physical library. From the View
menu, click the name of the physical library.
3 Click Setup→ Device→ Access→ FC Host.
Use the FC Host command to map partitions when
a Fibre Channel host is connected either to the
MCB or to an I/O blade.
If you change LUN mapping after host computers
or applications have already discovered devices,
you must make sure that device discovery occurs
again. Device discovery occurs automatically
when you reboot the library. Some host
computers have plug and play capability, which
discovers devices automatically. In general, host
applications do not discover devices
automatically.
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