Low HDD tranfer rate with FreeBSD 5.3-Release

[Eric Anderson]

 > 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




-- 
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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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