Date: Mon, 09 May 2005 12:13:39 -0700 From: Amandeep <aman@chamkila.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: john@essenz.com Subject: Re: Low HDD tranfer rate with FreeBSD 5.3-Release Message-ID: <427FB663.3090309@chamkila.org> In-Reply-To: <20050509190245.GF38839@dan.emsphone.com> References: <427FA802.90805@chamkila.org> <427FA8CD.8040405@centtech.com> <427FAB5F.6070508@chamkila.org> <427FAF73.7070702@centtech.com> <20050509190245.GF38839@dan.emsphone.com>
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Dan Nelson wrote: >In the last episode (May 09), Eric Anderson said: > > >>>Eric Anderson wrote: >>> >>> >>>>Amandeep wrote: >>>> >>>> >>>>>I am using Tyan S2098 MB with 160GB Maxtor ATA Drive and the >>>>>transfer rate is very low. FreeBSD 5.3-Release. >>>>>Any ideas what is going on here. >>>>> >>>>>The transfer rate is about 15MB/s >>>>> >>>>>when I run >>>>>#dd if=/dev/zero of=/usr/junk bs=8192 >>>>> >>>>> >>>Shouldnt it be around 54MB/s for a regular IDE drive. >>> >>> >>What about other block sizes? Also - you should paste your actual dd >>output here too. >> >>What's the model number of that drive? Maxtor claims (on one of >>their 160G drives) 17.8MB/s from inner diameter disk and 35.6MB/s for >>outer diameter for the 5400rpm drives. >> >> > >Yes, try 64k instead of 8k, and also compare read speeds. If you have >the time (could take an hour or so), try "dd if=/dev/ad0 of=/dev/null >bs=64k", run an "iostat 60" in another window, let the dd run through >the entire disk, and compare the relative speeds from start to finish. > >For the DiamondMax 160, the sustained throughput should be 26MB -> 50MB >as you go from inner to outer tracks. > > > OK with the above dd dd if=/dev/ad0 of=/dev/null bs=64k it gives me 56MB/s. from the start. Aman
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