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601354 Rev A Normal Operations 4-19
Normal Operation
The mount by media identifier and drive pool method is used
when a higher likelihood of mounting a specific medium
without waiting is desired. It is possible that the specific
medium could be mounted on any one of the drives listed in the
drive pool. Therefore, a user should not use a drive pool if it
contains a drive to which the user does not have access.
A drive selection algorithm is used to select the best drive to
satisfy the command. The algorithm attempts to use a drive in
the same archive as the medium. However, a drive in another
archive can be selected unless prevented by a Mount Media
command option. The resulting medium/drive pair is chosen to
satisfy the command.
The mount by media list and drive identifier method is used
when the specific medium to be mounted is unimportant except
for a specific list of candidates. A medium selection algorithm
is used to first select media that are in the same archive as the
drive. The second criterion is the medium with the lowest
mount count. The resulting medium/drive pair is chosen to
satisfy the command.
The mount by media list and drive pool method can be used
when a specific medium or drive used to satisfy the mount is
not important. A special set of criteria are used to select the best
medium/drive pair from these candidates. The archive
containing the most available drives from the specified drive
pool is selected first. A tie is broken by using the archive with
the largest number of applicable media from the media list. The
media from the media list that are in the selected archive are
then candidates. Other criteria can reduce the selection to one
medium/drive pair but are beyond the scope of this book.
However, a list of all possible medium/drive pairs is eventually
developed and reduced to the most likely candidate. The
resulting medium/drive pair is chosen to satisfy the command.