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              [html]<thead><tr><tdcolspan="4">Accessed Volume</td></tr><tr><tdrowspan="2">Was the grain copied?</td><tdrowspan="2">Host I / O operation</td><tdcolspan="2">Read</td></tr><tr><td>Write</td><td>Source</td></tr></thead><tbody><tr><tdrowspan="2">No</td><td>Read from the source volume.</td><td>Copy grain to most recently started target for this source, then write to the source.</td><td>Yes</td></tr><tr><td>Read from the source volume.</td><td>Write to the source volume.</td><td>Target</td></tr><tr><tdrowspan="2">No</td><td>If any newer targets exist for this source in which this grain was copied, read from the oldest of these targets. Otherwise, read from the source.</td><td>Hold the write. Check the dependency target volumes communications with the communications copied. If the grain is not copied to the next oldest farget for this source, copy and their target. Then, write to the target.</td><td>Yes</td></tr><tr><td>Read from the target volume.</td><td>Write to the target volume.</td></tr></tbody>
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