Re: Odd ZFS boot module issue on r332158

From: Andriy Gapon <avg_at_FreeBSD.org>
Date: Tue, 10 Apr 2018 23:51:09 +0300
On 10/04/2018 22:48, Andrew Gallatin wrote:
> On 04/10/18 11:25, Andriy Gapon wrote:
>> On 10/04/2018 15:27, Andrew Gallatin wrote:
>>> Is there something like tools/diag/prtblknos for ZFS?
>>
>> zdb.
>>
>> It has a manual page, but in the case like this you typically want to run
>> zdb -d[d*] <ZFS filesystem name> <file's inode number>
>> Add d-s until you get all the information you want.
>>
>> It looks like five d-s is needed to get individual blocks reported.
>>
> 
> Thanks for the instructions!
> 
> How do I interpret this output:
[snip]
>                0 L1  1:1f01016c000:1000 20000L/1000P F=3 B=16769122/16769122
>                0  L0 1:1f00f9e3000:20000 20000L/20000P F=1 B=16769122/16769122
>            20000  L0 1:1f00fa03000:20000 20000L/20000P F=1 B=16769122/16769122
>            40000  L0 1:1f00fa23000:20000 20000L/20000P F=1 B=16769122/16769122

The first number is an offset within the file (hex); Lx is a block level where
L0 is a data block, L1 is an indirect block just above data blocks, etc; x:y:z
is a (top-level) vdev number, a block offset on disk (hex) and a block size on
disk(hex); the rest is not as important.

The quoted offsets appear to be just below 2TB.



-- 
Andriy Gapon
Received on Tue Apr 10 2018 - 18:59:20 UTC

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