Well it's not simple indeed. I use ZFS on my home (not critical) box
(RAIDZ1). After 4 weeks uptime with varied workload I assumed it's
stable. Unfortunately ZFS crashed next week ;)
Tune your system for ZFS and the crashes will go away.
Read this: http://wiki.freebsd.org/ZFSTuningGuide
A running system with ZFS caches a lot of disk access (making it really
fast for some applications). WHen you run the 'top' command, you will
see that WIRED amount of ram is higher than a system without ZFS.
Mem: 161M Active, 114M Inact, 639M Wired, 1084K Cache, 199M Buf, 1086M
Free
What applications will benefit from ZFS? Read this article on MySQL and
ZFS:
http://dev.mysql.com/tech-resources/articles/mysql-zfs.html
It proposed that you allocate less ram to MySQL in your my.cnf and let
ZFS take care of caching.
Here are my loader.conf settings.
zfs_load="YES"
# ZFS tunings
vm.kmem_size="800M"
vm.kmem_size_max="800M"
# http://wiki.freebsd.org/ZFSTuningGuide
vfs.zfs.arc_max="160M"
vfs.zfs.vdev.cache.size="5M"
# and I have my root on zfs...
vfs.root.mountfrom="zfs:tank/root"
- Rudy
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** monkeybrains.net colocation **
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