Date: Wed, 14 Apr 2010 11:04:41 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-performance@freebsd.org Subject: Re: is trhere a problem with the HP SmartArray P410 and/or Postgres on FreeBSD ? Message-ID: <hq40et$tgo$1@dough.gmane.org> In-Reply-To: <4BC4D46B.9040805@arcor.de> References: <4BC4D46B.9040805@arcor.de>
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On 04/13/10 22:30, Christoph Weber-Fahr wrote: > Hello, > > on a new HP Proliant DL385 G6 I have a P410 with BBWC and > 8 hard drives in RAID5. > (BBWC is Battery Backed Write Cache Enabler, and the controller > is configured with 300M (75%) write cache). > > One of the applications we want to run is PostgreSQL (not the top > priority, else we would use a different RAID scenario). > > But before getting the system live, we tested the performance. > PostgreSQL gets a whole wopping 80 (!) tps out of this > scenario wit pgbench ( -c 5 -t 5000) Hmm yes, this is too slow. > Now I had not expected top performance, but something to the tune > of 500 tps should be well possible. And it's definitely a storage Yes, your expectations are correct. > or filke system issue, since CPU is bored to death during the > benchmark, while the file system is at 100% according to systat. > On a comparable Hardware our test machine runs as a VM under VMWare > and gets ~600 tps. > > Is there a known problem with this setup? > > OS is FreeBSD-amd64 7.2-p7 . Can you give more details about your hardware? CPU? Memory? File system? The "100% sys time" point makes it possible it's not the storage itself that is the issue. You can also collect more information: I'd recommend with either "iostat -x 1" or "gstat".
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