210 TroubleshootingDuplicate Devices DiscoveredIf both target ports (ports 1 and 2) on an I/O blade are connected to the same host, or if more than one hostis connected to a target port, you may see duplicates of all the devices connected to the initiator ports (ports3 – 6) of that FC I/O blade. To prevent this from happening, you can do either (or both) of the following:• If only one host is connected to a target port, you can use channel zoning to tell the target port whichdevices to see (see Configuring FC I/O Blade Channel Zoning on page 64).• If more than one host is connected to a target port, you can use host mapping to tell each host whichdevices to see (see Configuring Host Mapping on page 68).Duplicate Media Changers DiscoveredYou may see one or more medium changers being discovered multiple times. For information on why thishappens, see I/O Blade Internal Virtual Port for Media Changers on page 64.To prevent this, do the following:1 Ensure that host mapping is enabled (see Enabling/Disabling FC Host Mapping on page 65).2 Assign each media changer a unique LUN and map each one to the appropriate host (see ConfiguringHost Mapping on page 68).Identifying Tape DrivesYou can use the operator panel and the web client user interfaces to view information about all tape drivesinstalled in the library. In addition, you can identify tape drives, including the control path tape drive, inselected partitions. The web client also allows you to identify tape drives that are not assigned to specificpartitions. On the web client, you can only identify tape drives that are in a ready state.The operator panel Drive Information screen lists the following information for each tape drive:• Control path tape drive status — yes/no• Vendor• Model• Type• Serial number• Tape drive firmware version• Sled boot version• Sled application version• Mode status — online/offline, ready/not ready• Loaded status — unloaded/loaded• SCSI ID for SCSI tape drives• World Wide Node Name (WWNN) for Fibre Channel (FC) tape drives• SAS address for SAS tape drivesThe web client Identify Drives screen lists the following information for each tape drive:• Location coordinates• Mode status — online/offline
