Re: freebsd-performance Digest, Vol 4, Issue 7

From: Jin Guojun [DSD] (j_guojun_at_lbl.gov)
Date: 06/19/03

  • Next message: Petri Helenius: "Re: freebsd-performance Digest, Vol 4, Issue 7" 
    Date: Wed, 18 Jun 2003 16:09:58 -0700
To: Chuck Swiger <cswiger@mac.com>

    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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