Re: Problem updating bootcode on ZFS on root system with MBR

On 20.01.2014 23:32, Thomas Hoffmann wrote:
> I am running 11.0-CURRENT (r260850) with zfs on root with MBR.
> 
> After upgrading my 10.0-RELEASE (r260669) system to 11.0-CURRENT (r260850)
> my zpools reported that they needed to be upgraded. So, I upgraded my
> zpools and I am attempting to update the bootcode (as required). I managed
> to get the boot1 stage code updated, but cannot get the boot2 stage code
> updated. Here is what I have done:
> 
> # sysctl kern.geom.debugflags=0x10
> kern.geom.debugflags: 0 -> 16
> 
> # dd if=/boot/zfsboot of=/tmp/zfsboot1 count=1
> 1+0 records in
> 1+0 records out
> 512 bytes transferred in 0.014996 secs (34142 bytes/sec)
> 
> # gpart bootcode -b /tmp/zfsboot1 /dev/ada0s1
> bootcode written to ada0s1
> 
> # dd if=/boot/zfsboot of=/dev/ada0s1a skip=1 seek=1024
> dd: /dev/ada0s1a: Operation not permitted
> 
> The final dd statement fails with "operation not permitted". In all my
> research,  understood the initial sysctl command I ran would prevent this
> particular error from happening.
> 
> What do I need to do to get the boot2 code written to /dev/ada0s1a?

This will work only if ada0s1a isn't in use. The debugflags trick works
only for whole disk, i.e. for geoms with rank=1. Another way is
calculate needed offset and write bootcode directly to ada0.

-- 
WBR, Andrey V. Elsukov