Booting from ZFS RaidZ

Paul Wootton paul at
Fri May 29 17:18:42 UTC 2009

Doug Rabson wrote:
> On 27 May 2009, at 20:55, Paul Wootton wrote:
>> 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
>> Default:DemoPool:/boot/kernel/kernel
>> 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
> How frustrating. Can you give me some idea on your ZFS pool 
> configuration. Also, if you can dig out the symbol table for 
> /boot/loader (it should be lurking somewhere in your /usr/obj tree as 
> loader.sym), it would be interesting to see where it crashed (i.e. 
> whats the closest symbol to the value of EIP above).
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Erm, Opps.... Im an idiot....
I went back over my steps and realised the I had forgotten to do a "make 
distrib-dirs" and "make distribution"
Now it boots the kernel but I can not get it to mount the root filing 
I have got a few more thinks to try before I throw my hands in the air, 
but unfortunately that will not be until after the weekend (the BSD is 
my main PC at work)


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