Mention tablespaces as a problem for using file system snapshots.
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.57 2005/03/17 05:03:37 momjian Exp $
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$PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.58 2005/03/17 05:10:11 momjian Exp $
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-->
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<chapter id="backup">
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<title>Backup and Restore</title>
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@ -365,7 +365,7 @@ tar -cf backup.tar /usr/local/pgsql/data
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<para>
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If your database is spread across multiple volumes (for example,
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data files and WAL log on different disks) there may not be any way
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if you are using tablespaces) there may not be any way
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to obtain exactly-simultaneous frozen snapshots of all the volumes.
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Read your file system documentation very carefully before trusting
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to the consistent-snapshot technique in such situations. The safest
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