IBM Magstar 3494 manual Error Detection and Reporting, Inventory Update

intentionally damaging the library manager database or other operations. Use of password-protection is optional.

Error Detection and Reporting

When the library is powered on, the library manager, the 3490E/3590 tape subsystems and Virtual Tape Servers perform power-on diagnostics. The library performs real-time error detection, fault isolation, error reporting, and error recovery during normal operation.

In the event of a failure, the information is reported to the attached hosts for logging and possible host recovery actions. When appropriate, host console messages are posted by the library drive support software in the control program to request operator-required actions or to present information for the operator. Refer to ªChapter 7. Remote Library Manager Console Featureº on page 241.

Inventory Update

When inventory update is enabled and a door is opened then closed, an inventory update is performed upon the return to auto mode. This process checks all of the cartridge storage cells in the frames that had doors opened, and depending on the selection made during the teach process, may also check any adjacent frames to the frames that had doors opened.

Note: The drive feeds are also inventoried.

During an inventory update, processing of Audit and Eject operations are held until the update has been completed. Selected mounts and demounts are processed, depending on where the cartridge resides. No mounts or demounts are performed on cartridges which reside in a rack that must be veri®ed in the inventory update operation, until the inventory update is complete. The duration of the inventory update is affected by the number of database updates required and the number of mounts and demounts that are done concurrently with the inventory update.

The Disable Inventory Update option is made available to the operator, at the mode selection window, when the library is powered on. This option, if selected, disables the inventory update during a cold start of the library, and speeds up the process of bringing the library Online. Selecting Disable Inventory Update at the mode selection window does not disable Inventory Update during normal operation.

A Disable Inventory Update option is available from the Commands pull-down. This option disables the inventory update process on a cold start of the library, during normal operations, and speeds up the process of changing modes after the doors on the library are opened.

Note: The Disable Inventory Update option is not recommended for users who open the library doors to add and to remove cartridges because no changes in the library inventory are noted until inventory update is performed. If cartridge inserts and ejects are handled through the Convenience Input¤Output Station or High-Capacity Input/Output Facility, then running with Inventory Update disabled will speed operation. When the doors have opened, Partial Inventory Update can be selected from the Commands pull-down; this provides the most customer ¯exibility.

Chapter 3. Operational Characteristics 47