Many people are happily running an old pool with the new code. I have done that in a VM and run load over it just to be certain. The tuning still applies to i386. On amd64 vm backpressure works, but may actually be too aggressive - shrinking the ARC in favor of the inactive pages queue.
Cheers, Kip On Tue, May 19, 2009 at 12:54 PM, Dimitry Andric <dimi...@andric.com> wrote: > On 2009-05-19 19:41, Pete French wrote: >>> http://www.andric.com/freebsd/zfs13/r192269/zfs_mfc-r192269.diff.bz2 >> >> Thanks - am going to gve this a try later. Preseumably if I leave the >> pool at the revision it is currently on then I can revert back easily ? > > I'll just repeat what Kip told us, "The standard disclaimers apply. > This has only been lightly tested in a VM. Please do not use it with > data you care about at this time." > > That said, zpool(1M) tells: > > zpool upgrade [-V version] -a | pool ... > > Upgrades the given pool to the latest on-disk version. Once this is > done, the pool will no longer be accessible on systems running > older versions of the software. > > and later on: > > -V version Upgrade to the specified version. If the -V flag is > not specified, the pool is upgraded to the most > recent version. This option can only be used to > increase the version number, and only up to the most > recent version supported by this software. > > E.g. you can upgrade pools to ZFS v13, but there's no way back. If you > don't upgrade your pool, it should not destroy anything (but don't count > on it!), but you won't be able to test any new features either... > > >> Also, is this the version which no longer requires any tuning parameters >> in loader.conf ? That would be extermely interesting! > > As far as I know, the tuning stuff still applies, especially for i386. > On my i386 test VM with 1GB RAM, vm.kmem_size is about 163 MiB without > any tuning, while vm.kmem_size_max is about 320 MiB, so you get the warning: > > ZFS WARNING: Recommended minimum kmem_size is 512MB; expect unstable behavior. > Consider tuning vm.kmem_size and vm.kmem_size_max > in /boot/loader.conf. > > So please test, and let us know your findings. :) > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org" > -- When bad men combine, the good must associate; else they will fall one by one, an unpitied sacrifice in a contemptible struggle. Edmund Burke _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
