Fw: [303] Details on ZFS tuning on FreeBSD

[Lincoln F. Sternn]

----- Forwarded Message ----
From: Lincoln F. Sternn <lnkstern at yahoo.com>
To: 303 <303 at infosyndicate.net>
Cc: jon at kozubik.com
Sent: Mon, August 2, 2010 12:23:37 PM
Subject: [303] Details on ZFS tuning on FreeBSD

All (especially Teabag!),

I am still getting kernel panics while using ZFS on FreeBSD 8.0.  I am currently 

using the following parmeters on 303jose:

/sys/i386/conf/JOSE:

options         KVA_PAGES=512

/boot/loader.conf:

vm.kmem_size="1024M"
vm.kmem_size_max="1024M"
vfs.zfs.arc_max="512M"
vfs.zfs.vdev.cache.size="256M"
vfs.zfs.prefetch_disable=0


Ideally, I would like to dedicate 3 Gigs of memory to dedicated 
ZFS use.  I am still trying to figure out which parameters I can safely increase 

without panic'ing the kernel on boot.


Linc