If -T doesn't work now at all, how would making the patch conditional on using 
-T be unsafe?

It's an inherently unsafe operation to begin with. 

Thanks,

Josh Paetzel

> On Apr 22, 2016, at 5:58 PM, ilove zfs <ilove...@icloud.com> wrote:
> 
> No. As is said in the issue containing the patch, that would be quite unsafe. 
> At minimum it would require a -F or two or three.
> 
>> On Apr 22, 2016, at 03:56 PM, Josh Paetzel <jpaet...@fastmail.net> wrote:
>> 
>> I just tested it.
>>  
>> 
>> 
>> root@10:/home/jpaetzel # zpool create test md0
>> root@10:/home/jpaetzel # touch /test/hello
>> root@10:/home/jpaetzel # zpool export test
>> root@10:/home/jpaetzel # zdb -vuuue test
>> 
>> 
>> 
>> 
>> Uberblock:
>> magic = 0000000000bab10c
>> version = 5000
>> txg = 10
>> 
>> 
>> ....
>> 
>> 
>> 
>> root@10:/home/jpaetzel # zpool import -T 6 test
>> root@10:/home/jpaetzel # ls /test
>> hello
>> root@10:/home/jpaetzel # zpool export test
>> root@10:/home/jpaetzel # zpool import -T 5 test
>> root@10:/home/jpaetzel # ls /test 
>> root@10:/home/jpaetzel #
>>  
>> So the real question is would it be ok to make the change conditional on the 
>> zpool import -T flag.
>> 
>> 
>>  
>>  
>>> On Fri, Apr 22, 2016, at 04:12 PM, ilove zfs wrote:
>>> FWIW, that patch never worked for me.
>>>  
>>>> On Apr 22, 2016, at 02:01 PM, Josh Paetzel <jpaet...@fastmail.net> wrote:
>>>>  
>>>> Alright, well that helped me.
>>>> 
>>>> I'll test that patch now, then see if I can make it conditional on the
>>>> -T flag to import.
>>>> 
>>>>> On Fri, Apr 22, 2016, at 01:53 PM, Turbo Fredriksson wrote:
>>>>> On Apr 22, 2016, at 6:03 PM, Turbo Fredriksson wrote:
>>>>> 
>>>>> > This is (was?) broken on ZoL as well. Haven't tested it in a year
>>>>> > or so, but it WAS broken at least…
>>>>> 
>>>>> 
>>>>> Just found the ZoL ticket, and it seems to be still a problem
>>>>> (posted Dec 4, 2013, so it's an OOOOLD issue).
>>>>> 
>>>>> https://github.com/zfsonlinux/zfs/issues/1926
>>>>> --
>>>>> Imagine you're an idiot and then imagine you're in
>>>>> the government. Oh, sorry. Now I'm repeating myself
>>>>> Mark Twain
>>>> 
>>>> 
>>>> --
>>>> 
>>>> Thanks,
>>>> 
>>>> Josh Paetzel
>>>> 
>>  
>> --
>>  
>> Thanks,
>>  
>> Josh Paetzel
>>  
>>  



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