Disk Throughput test

Stephen Sanders ssanders at softhammer.net
Thu Oct 23 18:11:41 UTC 2008

Good point about the RAID.  It is set for RAID 5 as the data is supposed
to be protected.

Interestingly enough, diskinfo is telling me that the drive throughput
is 175MB/s.  I'm guessing that this means diskinfo is a mixture of reads
and writes?


Chuck Swiger wrote:
> 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,

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