Item: Least recently used device selection for tape drives in autochanger.
Date: 12 October 2009
Origin: Thomas Carter <tcarter@...>
What: A better tape drive selection algorithm for multi-drive
autochangers. The AUTOCHANGER class contains an array list of tape
devices. When a tape drive is needed, this list is always searched in
order. This causes lower number drives (specifically drive 0) to do a
majority of the work with higher numbered drives possibly never being
used. When a drive in an autochanger is reserved for use, its entry should
be moved to the end of the list; this would give a rough LRU drive
Why: The current implementation places a majority of use and wear on drive
0 of a multi-drive autochanger.
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