On Tue, Apr 5, 2016 at 5:05 PM, Jorgen Lundman <[email protected]> wrote:

>
> Having had a handful of disks in this situation, and I had to dd the start
> and end of the disks to be able to use them again, is rather frustrating.
>

Sounds like exactly the use case for "zpool labelclear".


>
> ZFS is supposed to be admin friendly, so we don't have to dick around with
> partitions and dd blanking a disk just because a label got corrupted. (Even
> if it is not ZFS's fault).
>

I agree, that's why we're implementing "zpool labelclear".


>
> I find the discussion of "giving users a loaded gun" most peculiar, should
> they perhaps not use Unix at all? Why is removing a snapshot the same
> command as destroying your whole dataset? That's one space away from
> disaster. There already is existing precedent. But this sort of argument
> that I am using is tedious, sorry. :)
>
> Either we have a command that does what it says, and clears the label, or
> lets not having it at all, and refer people to dd and lets hope they don't
> use 'dd' "more wrong" than labelclear. :)
>

I agree, and "zpool labelclear" is going to clear the label.

"zpool labelclear" is not going to overwrite something that isn't a zpool
label, in part because I haven't heard any use case for it.

--matt



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