Can't get 8.2-STABLE to boot from ZFS v28 with ashift=12

[Geoffrey Mainland]

On Fri, Jul 22, 2011 at 1:35 AM, Artem Belevich <art at freebsd.org> wrote:
> On Thu, Jul 21, 2011 at 9:12 PM, Geoffrey Mainland <mainland at apeiron.net> wrote:
>> I'm trying to get a system up and running with a couple new WD EARS
>> drives on 8.2-STABLE (built July 20, so it has ZFS v28 support). I'd
>> like to be able to boot from a ZFS pool where I've used the gnop trick
>> when creating the pool to make sure ZFS accesses my drive in 4k chunks.
>> Booting from ZFS without using gnop (so ashift=9) works beautifully, but
>> when I use the gnop trick to create the pool (ashfit=12), ZFS booting
>> doesn't work at all. I have a script to build my pool with and without
>> using gnop. Without gnop, I create the pool like this:
>>
>> zpool create $TANK gpt/${DISK0} gpt/${DISK1}
>>
>> With gnop, the pool is created like this:
>>
>> gnop create -S 4096 gpt/${DISK0}
>> gnop create -S 4096 gpt/${DISK1}
>> zpool create $TANK gpt/${DISK0}.nop gpt/${DISK1}.nop
>>
>> zpool export $TANK
>>
>> gnop destroy gpt/${DISK0}.nop
>> gnop destroy gpt/${DISK1}.nop
>>
>> zpool import $TANK
>>
>> Other than this, the pools are set up identically by the script.
>>
>> Without gnop I'm golden. With gnop, on boot I get the spinner and then
>> the computer reboots (it looks like boot0 fails).
>>
>> Any ideas what might be going on?
>
> Did you install updated bootloader, too? If not, you probably will
> have trouble booting.

Yes, I absolutely did use gpart to install an up-to-date bootloader.

Geoff