On Tue, Aug 31, 2010 at 2:42 PM, Evgeniy Sudyr <eject.in.ua@gmail.com>wrote:

quoted text
> Why controller's cache matters if current write speed is 0.5 Mb/sec ?
> In windows (prior installation OBSD) I noted ~ 80 MB/sec write speed
> on same configuration.
>
> My current test (after deleting array and installing on single SATA disk):
>
> # dd if=/dev/zero of=/tmp/test bs=1 count=10000000
> 10000000+0 records in
> 10000000+0 records out
> 10000000 bytes transferred in 17.020 secs (587515 bytes/sec)
>

500KB/s is pretty good with bs=1.  on my own (rather old) machine I get
64KB/s with bs=1.  but if you don't use an insanely small block size
performance goes way up.  with bs=64k that same machine jumps from 64KB/s to
5.5MB/s.

-ken