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In this Document

Goal

Solution

Applies to:

Goal

When a tape device disappears from the fabric, such as when a switch is disabled or a cable was pulled, the device links in /dev/rmt disappear and the device will become offline to the backup application.  

This document will assist in reconfiguring the tape device in the host system and re-establish communication with the Fibre Channel tape drive.

Solution

1.  Identify the tape device or device path from the /var/adm/messages file.  The device's WWN is in the
     device path. The /dev/rmt device filename mapped to this device can be identified in /etc/devlink.tab.

2.  Verify that the tape device's port is enabled in the SAN switch administration tool/GUI.  Make sure
     it is enabled.
     
3.  Verify that the tape device is configured in the host system.
      # cfgadm -al
      Ap_Id                              Type                Receptacle   Occupant           Condition
      c2                                   fc-fabric           connected    configured         unknown
      c2::500104e08b3fbbe6     unknown          connected    unconfigured   unknown
      c2::500104f000795ed9     tape                connected    configured       unknown
      c2::500104f0009e929e     med-changer  connected    configured         unknown
      c2::500110a0008c35ba    med-changer  connected     configured        unusable
      c3                                   fc                 connected    unconfigured     unknown

      Note:  the device's world wide name in the tape library configuration should match the
      world wide name of the device in the cfgadm output.

      If unconfigured, run 'cfgadm -c configure <Ap_Id>'.  For example,
      #  cfgadm -c configure <Ap_Id>

      If configured,  verify if the symbolic link to this device exists:
      #  ls -l | grep <pWWN>
      If not existing, unconfigure the device and then, reconfigure:
      # cfgadm -c unconfigure <Ap_Id>
      # cfgadm -c configure  <Ap_Id>

      
4.  Verify that the device is configured and the symbolic links are created according to the device
      definitions in /etc/devlink.tab
      # cfgadm -al
      # ls -l | grep <pWWN>
     
5.  Verify if the device can be varied online in the backup application.

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