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Summary



This article describes how to enable device persistency for a jukebox that has already been defined.

Resolution



Device persistency checks which tape driver (operating system-dependent) is associated with which tape drive (hardware), based on serial number. If there is a change in the driver, the database is updated.

This can occur if there is a change made to the SAN and the tape drives present themselves differently to the nodes on the SAN.

Device persistency checking occurs automatically when a tape is allocated. You do not need to run detect anywhere else to enable the checking. Run detect (-q or -g) on all SAN nodes to ensure that serial numbers are being reported.

To enable the device persistency logic:

  1. Open a DPX command prompt window and run detect-q. Serial numbers for each drive should be reported.
  2. Start the DPX GUI.
  3. Go to the Configure/Devices screen in the GUI. Select the robotic library.
  4. Check the following under the Options menu | Allow to update Unique ID
  5. Double-click the first drive in the library. The Unique ID field will now be editable.
  6. Cut and paste the entire serial number for this drive from the detect output into the Unique ID field. Make sure there are no leading or trailing spaces. The entry in this field must match the serial number exactly. For example: COMPAQ SDLT320 RBD17Y0182
  7. Click OK, and do the same for the rest of the drives.
  8. 8. Go to the Device Control/Jukebox operations screen of the GUI and choose to read the tape label of one tape to each drive (one at a time). If it works, the serial number has been updated correctly. If you receive an RC=1185 error at any time, there was a mistake on that drive.