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"]

Emil Smolenski ambsd at
Thu Nov 19 23:04:14 UTC 2009

On Thu, 19 Nov 2009 17:23:55 +0100, Robert Noland <rnoland at>  
> Ok, I was concerned about the assembly code... So, I've been chatting
> with jhb@ this morning.  Please try this patch that jhb@ came up with
> instead of Matt's latest patch.

On Thu, 19 Nov 2009 17:55:10 +0100, John Baldwin <jhb at> wrote:
> Actually, I had missed updating one place, please use this instead.   
> Also, I
> think that this will fix using > 2TB volumes even in the GPT case as
> zfsboot.c was always using 32-bit LBAs even for the GPT case.

Thanks a million! Both patches works for me. Great work!
I know that we have missed the boat but maybe there is opportunity to  
catch it up by swimming and commit these patches to 8-STABLE before  
8.0-RELEASE? Thanks!


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