PG HA solution using DBRD

Hi All,
I 'm testing a HA solution for a PG version 9.01 database configured
using DBRD for pg_xlog directory and user data /table space
partitions.( block disk changes are copied from master to slave )
the archive mode option is off for both master and slaver node, when I
power off master without a clean PG shutdown the slave database server
will not start. Bellow is the errror, what are my option to increase the
checkpoint frequency ?
archive_mode is off for both server

database system was interrupted; last known up at 2010-11-09 08:27:02 PST
2010-11-09 13:20:03 PST [8505]: [2-1] LOG: could not open file
"pg_xlog/00000001000000BC00000006" (log file 188, segment 6): No such
file or directory
2010-11-09 13:20:03 PST [8505]: [3-1] LOG: invalid primary checkpoint
record
2010-11-09 13:20:03 PST [8505]: [4-1] LOG: could not open file
"pg_xlog/00000001000000BC00000006" (log file 188, segment 6): No such
file or directory
2010-11-09 13:20:03 PST [8505]: [5-1] LOG: invalid secondary checkpoint
record
2010-11-09 13:20:03 PST [8505]: [6-1] PANIC: could not locate a valid
checkpoint record
2010-11-09 13:20:03 PST [8499]: [2-1] LOG: startup process (PID 8505)
was terminated by signal 6: Aborted
2010-11-09 13:20:03 PST [8499]: [3-1] LOG: aborting startup due to
startup process failure
postgres(at)proc5-15:errorlog$

Thank you
Isabella

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Isabella A. Ghiurea

Isabella(dot)Ghiurea(at)nrc-cnrc(dot)gc(dot)ca
Canadian Astronomy Data Centre |http://www.nrc-cnrc.gc.ca/eng/services/hia/data-centre.html
National Research Council of Canada, Herzberg Institute of Astrophysics
5071 West Saanich Road, Victoria BC V9E 2E7, Canada
Phone: 250 363-3446 fax: 250 363-0045