> There's a checkpoint_warning option. Set it to 3600 and you should get > messages in the log. Correlate those to the issues (do they happen at the > same time?). After setting "checkpoint_warning" to 3600, can you explain on how do I correlate with the messages? > If you can, install iotop and watch the processes that cause the I/O. I tried installing "iotop", but it failed to run because it requires Linux >= 2.6.20. Our CentOS5.2 is 2.6.18-8. > What we need is more details about your setup, especially > - checkpoint_segments > - checkpoint_timeout > - shared_buffers # - Memory - shared_buffers=1536MB # - Planner Cost Constants - effective_cache_size = 4GB # - Checkpoints - checkpoint_segments=32 checkpoint_timeout=5min checkpoint_warning=270s # - Background writer - bgwriter_delay = 200ms bgwriter_lru_percent = 1.0 bgwriter_lru_maxpages = 5 bgwriter_all_percent = 0.333 bgwriter_all_maxpages = 5 > also it'd be nice to have samples from the vmstat/iostat and messages from > the log. Unfortunately, I don't have "exact" logs when the problem actually happened -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
