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Mention file system replication as a high availability solution in the

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shared hardware section, and mention DRBD as a popular solution.
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Bruce Momjian 2007-02-01 21:02:48 +00:00
parent a9d5fb5a02
commit 52096ae119
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doc/src/sgml/high-availability.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/high-availability.sgml,v 1.15 2006/12/01 03:19:48 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/high-availability.sgml,v 1.16 2007/02/01 21:02:48 momjian Exp $ -->
<chapter id="high-availability">
<title>High Availability and Load Balancing</title>
@ -99,10 +99,17 @@
disk array fails or becomes corrupt, the primary and standby
servers are both nonfunctional. Another issue is that the
standby server should never access the shared storage while
the primary server is running. It is also possible to use
some type of file system mirroring to keep the standby server
current, but the mirroring must be done in a way that ensures the
standby server has a consistent copy of the file system.
the primary server is running.
</para>
<para>
A modified version of shared hardware functionality is file system
replication, where all changes to a file system are mirrored to a file
system residing on another computer. The only restriction is that
the mirroring must be done in a way that ensures the standby server
has a consistent copy of the file system &mdash; specifically, writes
to the standby must be done in the same order as those on the master.
DRBD is a popular file system replication solution for Linux.
</para>
<!--