Figure 6–1 SCSI Command Translation for Autochanger Operation
Micro−move
Micro−move
Micro−move
ID
ID
ID
Macro−move
ID
Profile
Micro−move
Micro−move
Micro−move
ID
ID
ID
Macro−move
ID
Micro−move
Micro−move
Micro−move
ID
ID
ID
Macro−move
ID
SCSI Command
Mechanism
Code
Profile
Profile
Profile
Examples of high-level commands are:
•
Move/Exchange—move a cartridge from element A to element B.
•
Seek—position the transport at a target element
•
Test—test for the presence of a cartridge at a target element
•
Actuate mailslot—rotate the mailslot assembly to perform I/O with the user
The commands are translated into a series of moves which are basic autochanger
functions. These submoves are called macro-moves. In this library the macro-
moves are as follows.
•
Move carriage—position the picker transport to a position along the rails.
•
Flip—rotate the picker
•
Cartridge I/O—plunge and retrieve the picker finger assembly to move
cartridges between the picker and magazines, drives, or the mailslot.
•
Rotate mailslot—plunge and retrieve the picker finger assembly/leadscrew
nut to rotate the mailslot assembly toward and away from the user.
For example. ‘‘Move element 11 to element 2 with flip’’ is transformed into the
following sequence of autochanger functions.
1.
Determine that element 11 is a storage slot and element 2 is a drive.
6–2 Theory of Operation
Summary of Contents for RW504-ZA
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