Booting from ZFS RaidZ

Paul Wootton paul at
Wed May 27 19:55:54 UTC 2009

Doug Rabson wrote:
> On 27 May 2009, at 16:38, Paul Wootton wrote:
>> Hi,
>> With the recent changes allowing RaidZ boot, I thought I would 
>> finally drop my mirror pack and go RaidZ.
>> The only problem I now have is
>> demophon# zpool set bootfs=DemoPool/root DemoPool
>> cannot set property for 'DemoPool': operation not supported on this 
>> type of pool
>> Is this still a work in progress, or do I have something a-miss?
>> I am using current as of today
>> "demophon# uname -a
>> FreeBSD demophon 8.0-CURRENT FreeBSD 8.0-CURRENT #17: Wed May 27 
>> 13:18:06 BST 2009     paul at demophon:/usr/obj/usr/src/sys/DEMOPHON  
>> amd64"
> This is a limitation which I will remove as soon as I have a little 
> time to work on it. Basically, Solaris can only boot from simple 
> structures such as mirrors and collections of mirrors. The code 
> enforces this by stopping you from setting the bootfs property if the 
> pool configuration is too complex for the Solaris boot code. I will 
> simply remove this limitation for FreeBSD since we can now boot from 
> any pool configuration.
> In the meantime, you can still boot if you put your root filesystem 
> files in the root of the pool. Not ideal I know but I'll try to fix it 
> properly soon.

This does seem to work correctly for me as I get a BTX crash (see below)

Verifying DMI Poll Data .............
FreeBSD/i386 boot
int=00000000  err=00000000  elf=00010083  eip=00192adf
eax=00192e02a  ebx=df5610ed  ecx=d485b986  edx=00000000
esi=00000040  edi=000935d0  ebp=0009339c  esp=00000000
cs=0008 ds=0010 es=0010 fs-0010 gs=0010 ss=0010
cs:eip=c5 e4 00 66 0f 73 dc 02-ff e4 b8 8d 8d bc f2 2a
  e9 ba e6 f4 2a 8a d8 24-df 86 c4 be 00 2b e9 8b
ss:esp=16 e8 00 f0 16 e8 00 f0-c3 e2 00 f0 16 e8 00 f0
  16 e8 00 f0 54 ff 00 f0-b8 6e 00 f0 16 e8 00 f0
BTX halted

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