Date: Thu, 23 Oct 2008 13:50:03 -0400 From: Stephen Sanders <ssanders@softhammer.net> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-performance@freebsd.org Subject: Re: Disk Throughput test Message-ID: <4900B94B.5000108@softhammer.net> In-Reply-To: <A0D72207-41DF-444A-8911-22EFCB5D747C@mac.com> References: <490097CC.9010802@opnet.com> <A0D72207-41DF-444A-8911-22EFCB5D747C@mac.com>
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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? Thanks 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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