FW: NDO Utils Question

[Wheeler, JF (Jonathan)]

> -----Original Message-----
> From: Christopher McAtackney [mailto:cristoir at gmail.com]
> Sent: 25 June 2009 16:33
>
> > Results passing into the command pipe are stored.  The relevant
> > parameters are in nagios.cfg; they are external_command_buffer_slots and
> > check_result_buffer_slots - by default these are set to 4096 (see
> > documentation within the configuration file).
> 
> Great, that's what I was hoping for. Do you have any experience of
> setting this buffer to much higher values? Not that I necessarily
> intend to, but it's always useful to know the effects of pushing the
> system to its limits.

Routinely we have external_command_buffer_slots set to 40960 and check_result_buffer_slots set to 61440; this is because we have had problems with our SQL server (it gets very busy for other databases) which delays response to NDOUtils updates which fills up these buffers.  You can see the current, high-water mark and setting for these parameters by running command nagiostats (the highest we have reached recently was about 25k buffer slots used).

Jonathan Wheeler 
e-Science Centre 
Rutherford Appleton Laboratory
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