freebsd-performance Digest, Vol 4, Issue 7

[Jin Guojun [DSD]]

Chuck Swiger wrote:

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> Jin Guojun [DSD] wrote:
> [ ... ]
> > But this seems to have different problem. At least write to RAID 1 requires
> > twice bus bandwidth for soft RAID 1. So, read should be faster than write.
> > But current read is 67 MB/s, write is 10 MB/s. Something is not working.
>
> What is the write performance to a bare hard drive?

60 MB/s. Multiple writes (3 or 4 drives) are maximized at 147 MB/s.

> I'd expect your write performance to be somewhat higher, true, but your drives
> read at 33 MB/s, and write at 15 MB/s, your write performance is nominal.

If I got 30 MB/s on write, I would not complain at all.

    -Jin