</para>

<para>

For reliable recovery when changinga cluster from

<varname>fsync</varname>off to on, it is necessary to force all

modified buffers in thekernel to durable storage. This can be

done while the clusteris shutdown or while fsync is on by running

<command>initdb--sync-only</command>, running <command>sync</>,

unmounting thefile system, or rebooting the server.

For reliable recovery when changing<varname>fsync</varname>

off to on, it is necessary to force all modified buffers in the

kernel to durable storage. This can be done while the cluster

is shutdown or while fsync is on by running <command>initdb

--sync-only</command>, running <command>sync</>, unmounting the

file system, or rebooting the server.

</para>

<para>