Date: Wed, 18 Jun 2003 16:09:58 -0700 From: "Jin Guojun [DSD]" <j_guojun@lbl.gov> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-performance@freebsd.org Subject: Re: freebsd-performance Digest, Vol 4, Issue 7 Message-ID: <3EF0F146.86CE2F33@lbl.gov> References: <20030614190033.7F0DE37B407@hub.freebsd.org> <20030615091254.M85497@bluhayz.org> <3EF0B507.2B1B6FDF@lbl.gov> <3EF0EE8D.8040806@mac.com>
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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
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