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:
1 2 3 | cancer@quad/usr/home/cancer[52]<strong>22:34</strong>#mysql -uroot -p cancerwp < /usr/home/cancer/cancer_blog_17.08.2009.sql Enter password: cancer@quad/usr/home/cancer[53]<strong>22:54#</strong> |
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.
1 2 3 4 5 | 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…
1 2 3 4 5 6 | 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.
1 2 | 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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