http://wiki.freebsd.org/ZFSTuningGuide
If you need to extend them beyond 512M, you need to recompile your kernel with increased KVA_PAGES option, e.g. add the following line to your kernel configuration file to increase available space for vm.kmem_size beyond 1 GB: options KVA_PAGES=512
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Florian Smeets
Fri, 11 Jun 2010 07:14:23 -0700
On 6/8/10 11:11 AM, Yoshiaki Kasahara wrote: > Hello, > > I'd like to add another instance of similar problems. I recently > updated my FreeBSD amd64 box with ZFS root and 8GB RAM from 8-STABLE > (as of Mar 1st) to 8.1-PRERELEASE (as of May 27th). After that, my > box started to crash every couple of days due to kmem_map too small. > Read the rest of this entry »
On a system here with 8GB of RAM and a very large zpool consisting of multiple zdevs, little tuning was needed. The system is running 8-STABLE(amd64) as of a month or two ago. The only things I have set in /boot/loader.conf are:
vm.kmem_size="12G" vfs.zfs.arc_max="4G" Read the rest of this entry »
听说ZFS挺强悍的，由于对Sun的系统有恐惧症，并且FreeBSD 8.0上的ZFS文件系统不再是试验性的特性了，所以应该比较完善的具备ZFS的各项功能。 Read the rest of this entry »