WAL archiving on a synchrnous standby

We have enabled WAL archiving on our synchronous standby and are getting
an unexpected behavior. WAL records are being deleted from pg_xlog directory
but are not being written to our archive directory. Also, one or two WAL
files per day are left in pg_xlog. I believe directory permissions are set
properly on the archive directory and there are no error messages in the
pg_log/postgres-xxx.log file. The archive command is un-commented in
postgresql.conf. Things are acting like a pg_archivecleanup command is
periodically executed on the pg_xlog directory. Has anyone seen this? Does
WAL archiving act differently on a synchronous standby?

Postgres 9.2.4
2.6.32-220.4.2.el6.x86_64 SMP
x86_64 x86_64 x86_64 GNU/Linux




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