Amandeep wrote:
Dan Nelson wrote:
In the last episode (May 09), Eric Anderson said:
Eric Anderson wrote:
Amandeep wrote:Shouldnt it be around 54MB/s for a regular IDE drive.
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
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
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