>> It seems the throughput is bad. The small IO test showed good numbers
>> for iops, but the second test (and I guess other people's suggestion
>> to try dd from /dev/zero) will show that you seem to have a "thin
>> wire" from the drive to the computer, it seeks fast but transfers data
>> slowly.
>>
>
> Well, i dit the dd stuff and post result before, but i think it is
> still low for expectations.
A website
https://hdd.userbenchmark.com/SpeedTest/3265/ST250DM000-1BD141
quotes this Seagate drive at 7200 RPM, and a max write speed of
90Mbyte/sec.
You would not see this on OpenBSD but you do see 41 MB/s which is low.
It seems to be writing only half a track per revolution of the disk.
The controller is not keeping up with the drive. It shows as
a 6.0 Gb/s SATA controller so it should be able to keep up.
Adjusting the interface standard on the BIOS should make a difference;
I have seen 2x improvement (80MB/s vs 160 MB/s) on newer SATA drives.
John
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