Hi Edke,
In addition to Martin, (sorry not related to monit), you can tell postgresql
that a backup
is currently running, by a simple pg_start_backup('ID')/pg_stop_backup()
functions into postgresql.
The postgresql system, in such case, do not change files on disk but only the
transaction log.
This allow to do a consistent rsnaphot/rsync.
After receiving pg_stop_backup(), the transaction log is dump into database
files .
pg_dump is a heavy CPU consumming process, especially when compressing, even
with 'nice' and 'ionice' .
Hope it can help.
Regards.
Eric
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