doc: clarify behavior of pg_upgrade's clone mode
Be more precise about the benefits of using clone mode.
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@ -382,11 +382,11 @@ NET STOP postgresql-&majorversion;
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requires that the old and new cluster data directories be in the
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same file system. (Tablespaces and <filename>pg_wal</filename> can be on
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different file systems.)
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The clone mode provides the same speed and disk space advantages but will
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not leave the old cluster unusable after the upgrade. The clone mode
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also requires that the old and new data directories be in the same file
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system. The clone mode is only available on certain operating systems
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and file systems.
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Clone mode provides the same speed and disk space advantages but
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does not cause the old cluster to be unusable once the new cluster
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is started. Clone mode also requires that the old and new data
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directories be in the same file system. This mode is only available
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on certain operating systems and file systems.
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</para>
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<para>
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