Re: GPT boot with ZFS RAIDZ "ZFS: i/o error - all block copies unavailable"

Robert Noland napsal(a):
> On Thu, 2009-10-15 at 14:08 +0200, Radek Valášek wrote:
>   
>> Hi,
>>
>> I want to ask if there is something new in adding support to 
>> gptzfsboot/zfsboot for reading gang-blocks?
>>     
>
> Ok, I can't figure out any way to test this... beyond the fact that it
> builds and doesn't break my currently working setup.  Can you give this
> a try?  It should still report if it finds gang blocks, but hopefully
> now will read them as well.
>
> robert.
>
>   
Big thanks for the patches Robert, I will definitely test them as soon 
as possible (tomorrow) and report the results immediately to list. I can 
repeat this issue probably at any time (up to cca 30 times tested with 
the same result), so don't bother about the broken booting, I'm prepared 
for it...

vaLin
>>  From Sun's docs:
>>
>> Gang blocks
>>
>> When there is not enough contiguous space to write a complete block, the ZIO
>> pipeline will break the I/O up into smaller 'gang blocks' which can later be
>> assembled transparently to appear as complete blocks.
>>
>> Everything works fine for me, until I rewrite kernel/world after system 
>> upgrade to latest one (releng_8). After this am I no longer able to boot 
>> from zfs raidz1 pool with following messages:
>>
>>  >/ ZFS: i/o error - all block copies unavailable
>> />/ ZFS: can't read MOS
>> />/ ZFS: unexpected object set type lld
>> />/ ZFS: unexpected object set type lld
>> />/
>> />/ FreeBSD/i386 boot
>> />/ Default: z:/boot/kernel/kernel
>> />/ boot:
>> />/ ZFS: unexpected object set type lld
>> />/
>> />/ FreeBSD/i386 boot
>> />/ Default: tank:/boot/kernel/kernel
>> />/ boot:
>> //
>> /I presume it's the same issue as talked in june-2009 current mailing 
>> list 
>> http://lists.freebsd.org/pipermail/freebsd-current/2009-June/008589.html
>>
>> Any success in that matter?
>>
>> Thnx for answer.
>>
>> vaLin
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