Date: Mon, 09 May 2005 13:44:03 -0500 From: Eric Anderson <anderson@centtech.com> To: Amandeep <aman@chamkila.org> Cc: john@essenz.com Subject: Re: Low HDD tranfer rate with FreeBSD 5.3-Release Message-ID: <427FAF73.7070702@centtech.com> In-Reply-To: <427FAB5F.6070508@chamkila.org> References: <427FA802.90805@chamkila.org> <427FA8CD.8040405@centtech.com> <427FAB5F.6070508@chamkila.org>
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> Eric Anderson wrote: > >> Amandeep wrote: >> >>> Hi all, >>> >>> 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 >>> >>> then do >>> #iostat 1 >> >> >> >> You should probably provide the appropriate information from dmesg >> output, along with what you expect it to be, and the outputs of the dd >> command. >> >> Eric >> Amandeep wrote: > Hi Eric, > > > Shouldnt it be around 54MB/s for a regular IDE drive. > > Here is the output of dmesg and iostat [..snip dmesg blob..] > IOSTAT > > tty ad0 cpu > tin tout KB/t tps MB/s us ni sy in id > 0 20 114.15 10 1.09 0 0 1 0 98 > 0 0 0.00 0 0.00 0 0 0 0 100 > 0 0 0.00 0 0.00 0 0 0 0 100 > 1 3 128.00 21 2.60 0 0 3 0 97 > 0 0 128.00 124 15.47 0 0 6 2 91 [..snip iostat blob..] (please try to avoid top-posting, it's hard to follow) 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. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------
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