On Oct 23, 2008, at 8:27 AM, Stephen Sanders wrote:
We have an application that is streaming data to disk at the maximum
rate the controller can sustain. The controller should be able to
develop something on the order of 600MB/s but we're only getting
450MB/s.
Are you using RAID-5 or RAID-10 config? RAID-5 is best suited for
read-only or read-mostly volumes; if you are doing an even mix
RAID-1/10 will generally perform better.
The application writes about 50GB into a file, closes the file, and
then
starts another file.
I've set all of the recommended settings from 3ware. I have tried
various settings for vfs.hirunningspace - various settings include
everything from 5MB to the cache size of the card (256MB).
Does anyone know if there is some file system performance limit?
You can also try running diskinfo -t to look for raw performance
numbers; if they are much different from the bandwidth your app is
getting, perhaps you need to tune your app...
Regards,
--
-Chuck
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