Re: 3Ware 9500S-12 RAID controller -- poor performance

["Dr. David Alan Gilbert" <dave@treblig.org>]

* subbie subbie (subbie_subbie@yahoo.com) wrote:
> A single thread writing at 30MB/s is still not on par
> with 3ware's specs.
> 
> I see that you're also running RAID5 and in this case
> 3ware did report bad write performance on RAID5 and
> that was fixed with recent firmwares. 
> 
> The latest linux driver off their website also
> includes the latest firmware inside it and flashes the
> card upon load, make sure to use that.

I've got driver/firmware that is about 2months old that
certainly helped; prior to that I was getting card
timeouts (although I also upgraded the e1000 driver
at the same time so it might have been that rather
than the 3ware that helped).
(Note: I don't expect a driver to perform a dangerous
operation like firmware flashing on boot!)

> I'm getting a little over 50MB/s when writing to my
> RAID volume when completely idle, there's no reason
> why you should get less.

Well my ~30MB/s is sucking over gig ether and writing
in 10MB chunks; but still 50MB/s for RAID5 feels like
it sucks.

> I'll let you guys know once I try JBOD (as soon as all
> the data is moved away).

Nod.

Dave
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