Low HDD tranfer rate with FreeBSD 5.3-Release
Eric Anderson
anderson at centtech.com
Mon May 9 11:44:15 PDT 2005
> 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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