Date: Thu, 23 Oct 2008 10:12:52 -0700 From: Chuck Swiger <cswiger@mac.com> To: Stephen Sanders <ssanders@softhammer.net> Cc: freebsd-performance@freebsd.org Subject: Re: Disk Throughput test Message-ID: <A0D72207-41DF-444A-8911-22EFCB5D747C@mac.com> In-Reply-To: <490097CC.9010802@opnet.com> References: <490097CC.9010802@opnet.com>
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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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