AHCI and ZFS: root mount error

[Volodymyr Kostyrko]

On Fri, 15 Jan 2010 21:13:39 +0100
Romain Garbage <romain.garbage at gmail.com> wrote:

> After setting ahci_load="YES" in /boot/loader.conf, I get a root mount error.
> ahci seems to attach to disk correctly (I get ada0 messages with no error)
> 
> Without ahci_load="YES", system boots fine, with ata module attaching to disk.
> 
> I have a full zfs system, set up following wiki instructions:
> http://wiki.freebsd.org/RootOnZFS/ZFSBootPartition
> (MBR scheme, ZFS in a FreeBSD slice, together with a swap partition)
> 
> I'm using a GENERIC kernel, RELENG_8 branch.

I have faced some problems that looks exactly like you say. I haven't investigated thoroughly after some quick-hack-repairs machine runs flawlessly.

1. I have moved to RELENG_8 from RELENG_8_0. I don't think this is it but zfsloader support was what I was looking for.

2. I reinitialised zfs partitions again with a boot code. But this time I used bs=512 dd option.

3. I recreated zpool.cache and replaced it on my pool.

Actually I don't know which one helped me, but my bet is for the third step and maybe for second.

-- 
Sphinx of black quartz judge my vow.