Software raid 5 performance tuning?

From: Marc Dreher (MarcDreher_at_gmx.net)
Date: 10/15/05

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    Date: Sat, 15 Oct 2005 20:29:55 +0200 (MEST)
To: debian-user@lists.debian.org

    Hello,

    after a recent (data) lossy HD crash I decided to build a software raid
    5 (3 disks)with Debian Sarge (2.6.13 Kernel) to keep that from
    happening again :-)
    Works pretty well but I am not really satsfied with the write
    performance (via samba).
    When uploading files via samba I get around 6 MB per second. Uploading
    to a non-raid disk works at full 100Mbit network throughput (10 MB
    p/s).
    The disks are current (S)ATA Maxtor 300 Gig, CPU is AMD 64 3000, 1 Gig
    RAM.
    I have one ATA disk as master on each of the two onboard IDE channels
    and the third SATA disk on one of my two SATA ports.
    I used a chunk size of 64KB with no strides.

    I already did some googling and found various threads on raid performance
    but most of them where a few years old and did not really yield the
    information I was looking for.

    So before having to experiment with all kind of settings I hope that
    somebody does have any tips or tuning hints for me?
    I think with current hard- and software I should at least be able to get
    enough write performance to fill up my 100MBit network while uploading :-)

    Thanks & best regards

    Marc 

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