Re: Boot with ZFS on single disk: "ZFS: i/o error - all block copies unavailable" [was: Re: GPT boot with ZFS RAIDZ "ZFS: i/o error - all block copies unavailable"]

From: Emil Smolenski <ambsd_at_raisa.eu.org>
Date: Wed, 18 Nov 2009 17:11:14 +0100
On Wed, 18 Nov 2009 14:50:47 +0100, Robert Noland <rnoland_at_freebsd.org>  
wrote:

>> >> Should I file a PR? I would
>> >> like to help in debugging it (however my skills in low-level C aren't
>> >> strong enough to do it on my own).
>> > Ok, the first thing I would like to see is "zdb -uuu".
>> # zdb -uuu pgpool
>> Segmentation fault: 11 (core dumped)

> Ok, this is disturbing...  It works fine for me on -CURRENT / amd64 and
> reports the root block pointer, which is what we need to locate the MOS.

  Booting from 8.0-*-amd64-memstick.img (Fixit# console) makes "zdb -uuu"  
happy:

Fixit# zdb -uuu pgpool
Uberblock

         magic = 0000000000bab10c
         version = 13
         txg = 443448
         guid_sum = 9780688847620645377
         timestamp = 1258560175 UTC = Wed Nov 18 16:02:55 2009
         rootbp = [L0 DMU objset] 400L/200P DVA[0]=<0:220000de400:200>  
DVA[1]=<0:2a80008ee00:200> DVA[2]=<0:330000b9000:200> fletcher4 lzjb LE  
contiguous birth=443448 fill=298  
cksum=8a9775385:3935d6d58c7:c028430c00a8:1b58ac4ebf42ac

-- 
am
Received on Wed Nov 18 2009 - 15:11:21 UTC

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