Re: RAID-3? (was: cvs commit: src MAINTAINERS)

From: Pawel Jakub Dawidek (pjd_at_FreeBSD.org)
Date: 08/21/04

  • Next message: Greg 'groggy' Lehey: "Re: RAID-3? (was: cvs commit: src MAINTAINERS)" 
    Date: Sat, 21 Aug 2004 10:45:26 +0200
To: "Kenneth D. Merry" <ken@kdm.org>

    On Sat, Aug 21, 2004 at 10:06:14AM +0200, Pawel Jakub Dawidek wrote:
    +> Here are already presented results of full RAID3:
    +>
    +> RAID3:
    +> Number of Bytes per Requests per
    +> Operations processes second second
    +> ----------------------------------------------------------------------
    +> READ 3 6329500 95
    +> READ 15 8981047 135
    +> READ 100 10719314 161
    [...]

    Whoa! I hacked RAID3 to do something like this while reading (for 3
    components):

            disk0+disk1
            disk0+(disk0^disk2)
            disk1+(disk1^disk2)
            disk0+disk1
            disk0+(disk0^disk2)
            disk1+(disk1^disk2)
            [...]

    And results are really impressive:

    RAID3 with new reading algorithm:
                    Number of Bytes per Requests per
    Operations processes second second
    ----------------------------------------------------------------------
    READ 3 8412626 126
    READ 15 12083590 181
    READ 100 15104488 227

    This is more than 40% of speed-up for 100 processes! 

    -- 
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd@FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!

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