ZFS mounting order

Goran Lowkrantz goran.lowkrantz at ismobile.com
Sun May 20 20:25:01 UTC 2012


Assuming that you are using some version of diskless (man diskless), I 
build NAS boxes using NanoBSD (man nanobsd) and in that setup, I need to 
move the cache from /boot/zfs to /etc/zfscache so the cache can be mapped 
to the files copied to the cfg partision. So I added the following file to 

# $FreeBSD: $

# PROVIDE: zpool
# REQUIRE: hostid
# BEFORE: zvol
# KEYWORD: nojail

. /etc/rc.subr


        if [ ! -z "$zpool_cache" -a -r "$zpool_cache" ]; then
                zpool import -c $zpool_cache -a

load_rc_config $name
run_rc_command "$1"

This works very well for a disk server from USB, CF or mSATA SSD.

I am not sure the BEFORE tag was required to make sure that this is the 
first ZFS related script run, before zvol, as zpool is sorted before zvol 
but I was not sure exactly how rcorder sorts.


--On Sunday, 20 May, 2012 10:41 AM -0400 Chris Brennan 
<lists at xaerolimit.net> wrote:

> Greetings!
> I have a FreeBSD 9 system with 3 different ZFS pools on it. I am
> booting from a ro CF Card w/o any major issues, the problem I am
> encountering is that zroot needs to be mounted at boot first, because
> it contains /usr, zhome and tank contain other various sub-partitions
> of /usr.
> Also, zroot causes me a lot of problems when I try to do "zpool
> import", when zpool gets to probing zroot, I get g_vfs errors printed
> to the console and the hacnine hangs till I reset it (which is
> obviously not acceptable behavior.) I was able to get around this when
> booting to my cf card by making / ro, which was my intention all along
> for that media.) I suspect this happens because there is a on that
> volume that is trying to replace something on / on either the USB boot
> img or on my CF card and this might be causing either to freak out.
> So I dunno what to do to get this working the way it should and some
> guidence would be greatly appreciated!
> --
>> Chris Brennan | http://xaerolimit.net | http://xaerolimit.net/forum
>> A: Yes.
>> > Q: Are you sure?
>> >> A: Because it reverses the logical flow of conversation.
>> >>> Q: Why is top posting frowned upon?
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