Re: OpenZFS port updated

Is the intention to eventually replace the zfs code in src/ ?  What will be the long-term relationship between src/ and ports/ for this?

Scott


> On Apr 17, 2020, at 12:35 PM, Ryan Moeller <freqlabs_at_FreeBSD.org> wrote:
> 
> FreeBSD support has been merged into the master branch of the openzfs/zfs repository, and the FreeBSD ports have been switched to this branch.
> 
> OpenZFS brings many exciting features to FreeBSD, including:
> * native encryption
> * improved TRIM implementation
> * most recently, persistent L2ARC
> 
> Of course, avoid upgrading your pools if you want to keep the option to go back to the base ZFS.
> 
> OpenZFS can be installed alongside the base ZFS. Change your loader.conf entry to openzfs_load=“YES” to load the OpenZFS module at boot, and set PATH to find the tools in /usr/local/sbin before /sbin. The base zfs tools are still basically functional with the OpenZFS module, so changing PATH in rc is not strictly necessary.
> 
> The FreeBSD loader can boot from pools with the encryption feature enabled, but the root/bootenv datasets must not be encrypted themselves.
> 
> The FreeBSD platform support in OpenZFS does not yet include all features present in FreeBSD’s ZFS. Some notable changes/missing features include:
> * many sysctl names have changed (legacy compat sysctls should be added at some point) 
> * zfs send progress reporting in process title via setproctitle
> * extended 'zfs holds -r' (https://svnweb.freebsd.org/base?view=revision&revision=290015)
> * vdev ashift optimizations (https://svnweb.freebsd.org/base?view=revision&revision=254591)
> * pre-mountroot zpool.cache loading (for automatic pool imports)
> 
> To the last point, this mainly effects the case where / is on ZFS and /boot is not or is on a different pool. OpenZFS cannot handle this case yet, but work is in progress to cover that use case. Booting directly from ZFS does work.
> 
> If there are pools that need to be imported at boot other than the boot pool, OpenZFS does not automatically import yet, and it uses /etc/zfs/zpool.cache rather than /boot/zfs/zpool.cache to keep track of imported pools.  To ensure all pool imports occur automatically, a simple edit to /etc/rc.d/zfs will suffice:
> 
> diff --git a/libexec/rc/rc.d/zfs b/libexec/rc/rc.d/zfs
> index 2d35f9b5464..8e4aef0b1b3 100755
> --- a/libexec/rc/rc.d/zfs
> +++ b/libexec/rc/rc.d/zfs
> _at__at_ -25,6 +25,13 _at__at_ zfs_start_jail()
> 
> zfs_start_main()
> {
> +	local cachefile
> +
> +	for cachefile in /boot/zfs/zpool.cache /etc/zfs/zpool.cache; do
> +		if [ -f $cachefile ]; then
> +			zpool import -c $cachefile -a
> +		fi
> +	done
> 	zfs mount -va
> 	zfs share -a
> 	if [ ! -r /etc/zfs/exports ]; then
> 
> This will probably not be needed long-term. It is not necessary if the boot pool is the only pool.
> 
> Happy testing :)
> 
> - Ryan
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