RE: ORION num_disks

No prob - I know the documentation doesn't make it very clear.  One
thing to be careful with - most filesystems are cached, so you'll
probably get unbelievably good numbers from Orion.  The way I usually
workaround this is to create files for testing that are much larger than
my RAM, and clear the OS buffer cache prior to testing.  You could also
try playing with the cache_size parameter for Orion, but that never
seemed to do much for me.  Hopefully in a future version of orion,
they'll support using directio on a filesystem where supported by the
OS, just like the Oracle database does (e.g.
filesystemio_options=directio).

 

One more thing to beware of - if you configure orion to run write tests
(it does read-only by default with the simple/normal type tests), it
will destroy any data in the specified test files - so make sure you
don't have it pointed to anything you want to keep, like a real Oracle
datafile.

 

Regards,

Brandon

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