Date: Mon, 09 May 2005 12:42:10 -0700 From: Amandeep <aman@chamkila.org> To: Amandeep <aman@chamkila.org> Cc: john@essenz.com Subject: Re: Low HDD tranfer rate with FreeBSD 5.3-Release Message-ID: <427FBD12.2090101@chamkila.org> In-Reply-To: <427FB663.3090309@chamkila.org> References: <427FA802.90805@chamkila.org> <427FA8CD.8040405@centtech.com> <427FAB5F.6070508@chamkila.org> <427FAF73.7070702@centtech.com> <20050509190245.GF38839@dan.emsphone.com> <427FB663.3090309@chamkila.org>
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Amandeep wrote: > 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 So how does the block size makes the difference?? What is the true transfer rate.? Aman > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" >
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