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    Speedup disk performance in NetBSD

    I got new HP Proliant DL160 G5 with three sata disk. For You interested in details here is a dmesg. Box setup wen’t smooth but disk operations performance was very low. Copy big file wrom disk to disk was around 6Mb/sec, fetching src from cvs stops from time to time for a while. To show how slow this is look how long take inserting backup of this blog to mysql again:

    cancer@quad/usr/home/cancer[52]22:34#mysql -uroot -p cancerwp < /usr/home/cancer/cancer_blog_17.08.2009.sql
    Enter password:
    cancer@quad/usr/home/cancer[53]22:54#

    Yup, 20 minutes and sql file was 85 Mb.

    After checking dkctl against disks, I found (with help of morr) that write cache is disabled.

    dkctl wd0 getcache
    /dev/rwd0d: read cache enabled
    /dev/rwd0d: read cache enable is not changeable
    /dev/rwd0d: write cache enable is changeable
    /dev/rwd0d: cache parameters are not savable

    After enabling…

    dkctl wd0 setcache rw
    /dev/rwd0d: read cache enabled
    /dev/rwd0d: write-back cache enabled
    /dev/rwd0d: read cache enable is not changeable
    /dev/rwd0d: write cache enable is changeable
    /dev/rwd0d: cache parameters are not savable

    … performance went to satisfying level. Copying is now about 40Mb/sec and restoring database above in less than minute.

    Unfortunettly saving this settings is not possible for now.

    dkctl wd0 setcache rw save
    dkctl: /dev/rwd0d: setcache: Operation not supported

    Maybe this have to be turned on in bios of server. For now i put cache enablers into /etc/rc.local.

    System is NetBSD 5.0.1_PATCH i386 with FFSv2 and WAPBL.


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