Hi
When I installed FreeBSD on my Lenovo Think Center Desktop I created a full ZFS
Root file system using Matthew Seaman's excellent article:
http://www.infracaninophile.co.uk/articles/install-on-zfs/
My system now is: /home/jamie $ uname -a
FreeBSD kontrol.kode5.net 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #4 r240560: Sun
Sep 16 18:40:56 BST 2012
r...@kontrol.kode5.net:/usr/src/sys/amd64/compile/KONTROL amd64
I've been wondering about ZFS tuning and have read some articles, including the
FreeBSD handbook and wiki articles and also some posts in the FreeBSD forum.
The FreeBSD handbook
[http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/filesystems-zfs.html],
section 21.2.1.3 Loader Tunables
suggests adding tunables to /boot/loader.conf for ALL architectures - which I
tested:
vm.kmem_size="330M"
vm.kmem_size_max="330M"
vfs.zfs.arc_max="40M"
vfs.zfs.vdev.cache.size="5M"
However, when I rebooted, although it did boot up ok dmesg showed a complaint
from ZFS about vm.kmem_size_max being less than 512mb. So I removed it. The
only line relating to ZFS tunables in my /boot/loader.conf file is now:
vfs.zfs.prefetch_disable=0
To stop this email becoming too long winded, what I'm interested in is are
there entries I need/should/recommend to add to /boot/loader.conf to tune ZFS
properly and/or Kernel config options I need/should/recommended to add to my
custom Kernel.
I have 2GB RAM, and I've set up 2GB GEOM Mirrored Swap. I'm only using one HDD
on the machine so it's a fairly basic setup on this machine. Maybe I don't need
to do/add anything at all?
Would anyone be kind enough to provide some guidance about this?
Best Wishes, Jamie.
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