Questions about ZFS Tuning
Jamie Paul Griffin
jamie at kode5.net
Mon Sep 17 12:20:17 UTC 2012
[ Volodymyr Kostyrko wrote on Mon 17.Sep'12 at 14:25:09 +0300 ]
> Handbook is old and cripsy about that all thing yet provides a useful
> link to http://wiki.freebsd.org/ZFSTuningGuide
> - you don't need kmem_size/arc tuning on amd64 generally;
> - zfs.zfs.prefetch_disable=0 will cause system eat more RAM then
> without it;
> - there are a lot of tunables but you should learn what you are doing
> before setting anything, for example changing recordsize for already
> running MySQL database filesystem will do nothing at all.
Yes, I've seen lot's of information about ZFS tunables on FreeBSD which will give me plenty of reading.
I set zfs.zfs.prefetch_disable=0 because some dmesg line suggested/implied it would benefit. I don't recall the exact output now. So, I think it's probably best I just leave things as they are as my system is functioning well enough, as far as I can tell anyway. This is the first time I've used ZFS on FreeBSD so I am still very much in the 'learning process' where that is concerned.
Thanks for your response Volodymyr. Very much appreciated.
Best wishes, Jamie.
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