Seeing the dreaded "ZFS: i/o error - all block copies unavailable" on 9.0-CURRENT

[John Baldwin]

On Thursday 18 February 2010 10:38:38 pm Chris wrote:
> > I'm seeing some difference in the bootloader output between using the
> > F12 workaround or not:
> >
> > F12 workaround mode:
> >
> > FreeBSD/i386 boot
> > Default: zroot:/boot/zfsloader
> > boot: status
> > config:
> >
> >             NAME     STATE
> >             zroot    ONLINE
> >        gpt/disk0   ONLINE
> >
> >
> > No F12 key pressed:
> >
> > FreeBSD/i386 boot
> > Default: zroot:/boot/kernel/kernel
> > config:
> >
> >              NAME     STATE
> >               zroot    ONLINE
> >          gpt/disk0   ONLINE
> >
> >
> > What's up with the differences between the Default boot setting?
> >
> 
> Sorry for the spam but I'm seeing something else very interesting....
> If I boot to Good Mode (F12) and break to the "boot:" prompt, the
> system boots if I type /boot/zfsloader. However, if I type
> /boot/kernel/kernel (as was seen in the Default setting when I didn't
> hit F12),  I get a crash that looks like the following:
> -----------------------------------------
> FreeBSD/i386 boot
> Default: zroot:/boot/zfsloader
> boot: /boot/kernel/kernel
> int=00000006    err=00000000  efl=00010882  eip=00200000
> eax=0018b070  ebx=ed7706bd ecx=c72e2ca8 edx=00000000
> esi=00000040   edi=000929d0  ebp=0009279c esp=00009401
> cs=0008  ds=0010   es=0010  fs=0010  gs=0010  ss=0010
> cs:eip=ff ff ff ff ff ff ff ff 7f-00 00 00 00 00 00 00 00
>            00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00
> ss:esp=36 80 0d 07 90 00 00 01-e9 c4 fc ff ff aa ac 84
>              c0 0f 84 86 00 00 00 a8-80 74 f2 88 c5 b0 3d aa
> BTX halted
> -----------------------------------------

I'm not sure how well we support booting a kernel from boot2 anymore, much 
less from zfsboot.  Using /boot/loader (or /boot/zfsloader) is probably the 
only tested (and realistically supported) case.

-- 
John Baldwin