I've just updated my server from 13.2-RELEASE to 14.0-RELEASE. This when pretty flawlessly, I had an issue with slow updating of the userland part. (The update after the first reboot)
It was extremely slow, update userland was already running for more then an hour. Pretting Ctrl+t to view what it was doing, i noticed it was [wait]ing most of the time.
Searching for this problem I found a solution speed it up dramaticly.
Setting the following control variable (in another terminal) made the update finish almost instantly.
sysctl vfs.zfs.dmu_offset_next_sync=0After the next reboot this flag is turned back to the original value.
Thanks to the contributors of the following references: