
74 Configuring Channels and Devices
Pre-Assigning Device Numbers
The New Device command is used to assign a LUN to a device that is currently not present on the system,
but for which a soft LUN—a LUN registered by the SNC during discovery—is not adequate.
A medium-changer will typically be the first odd numbered LUN (1) if available, or the first odd LUN available
after the last tape.
Particular applications or tools may require settings that are different than the defaults. To hard-code a
particular LUN for a particular device, add it into the device map first. Then bring the device online.
Devices usually come online before the SNC does. When the SNC boots up, it scans all devices and
determines where they are. At the end of the boot process, the appliance knows the LUNs available and is
ready to use them.
1 Right-click an appliance in the navigation panel or the graphical panel.
2 Select Device Map.
3 Select the Device Mapping dialog box, point to the Tools menu, then select New Device.
The default new device is a SCSI device on port (channel) 1, at target ID 0, and target LUN (device
LUN) 0.
4 Use the pull-downs at the end of each field to identify the device appropriately.
If the device to be added is a Fibre Channel device, you must supply the correct Unit ID.
5 Select OK.
The new device or devices is displayed in the right column of the Device Mapping dialog box.
6 Drag and drop the new device to a LUN assignment.
7 Select OK.
8 Rescan the channel.
Go to either R
escanning the SCSI Channel on page 67 or Rescanning the Fibre Channel on page 69,
as appropriate.
9 Rediscover the network segment. Go to Discovering the SAN
on page 59.
10 Refresh data on the appliance. Go to Refreshing Data
on page 62.
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