On Tue, Sep 30, 2008 at 12:08:48PM +0200, Holger Kipp wrote: > could anyone give recommendations (or share experience) regarding > using ZFS: > > - FreeBSD 7-Stable (amd64 with 8GB RAM) > + special tuning necessary (apart from increasing kernel memory > to 1 or more GB for ZFS)
Applicable loader.conf variables which should suffice: vm.kmem_size="1536M" vm.kmem_size_max="1536M" vfs.zfs.arc_min="16M" vfs.zfs.arc_max="64M" vfs.zfs.prefetch_disable="1" You can increase arc_max gradually, and performance should increase as you do so. Just be aware that too large of a value could result in kmem exhaustion on RELENG_7. There is a 2GB limit on kmem on RELENG_7 (yes, both i386 AND amd64), so do not try to increase vm.kmem_size or kmem_size_max above what I've shown there (others may have chosen something slightly higher, but picking 2048M will cause the system not to boot). If the limit is a problem, consider running CURRENT which increases this to 512GB. The prefetch setting should improve overall system performance during heavy ZFS load; many of us (including core members) have found this to be true. > - email (imap) I've had good experience with dovecot; I tend to stay away from Cyrus products (disgusting code with a history of security issues), and Courier (no interest). -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
