I'm experiencing the exact same issue:
PostgreSQL 9.1.6 on i686-pc-linux-gnu, compiled by gcc (GCC) 4.4.6 20120305
(Red Hat 4.4.6-4), 32-bit
CentOS release 6.3 (Final)
I might also turn full_page_writes off but I fear for data integrity in case
of a crash .....
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http://postgresql.1045698.n5.nabble.com/BUG-7521-Cannot-disable-WAL-log-while-using-pg-dump-tp5722846p5728727.html
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