Zfs heavy io writing | zfskern txg_thread_enter

[Michelle Sullivan]

Links to the grabs inline because the list seems to have converted
html->plaintext

Michelle Sullivan wrote:
> Steven Hartland wrote:
>   
>> On 19/02/2016 13:06, Michelle Sullivan wrote:
>>     
>>> Steven Hartland wrote:
>>>       
>>>> On 19/02/2016 11:58, Michelle Sullivan wrote:
>>>>         
>>>>> Niccolò Corvini wrote:
>>>>>           
>>>>>> Hi, first time here!
>>>>>> We are having a problem with a server running FreeBsd 9.1 with ZFS
>>>>>> on a
>>>>>>     
>>>>>>             
>>>>> You should upgrade to a supported version first...  9.3 would probably
>>>>> be the best (rather than 10.x) as it's still supported and uses the
>>>>> same
>>>>> ABI (ie you should need to reinstall all your ports/packages - though
>>>>> you should because it sometimes breaks things - at least check for
>>>>> broken things :) .)
>>>>>
>>>>> If you're not familiar "freebsd-update -r 9.3-RELEASE upgrade" will
>>>>> help
>>>>> you do it without too many problems.
>>>>>           
>>>> 9.3 is still ancient, and while "supported" its not in active
>>>> development, and to be blunt no one will be interested in helping to
>>>> diagnose any actual issue on something so old.
>>>>         
>>> So supported is not really supported... Is that an official position?
>>>       
>> Supported for 9.x, which is a "Legacy Release", I would say is
>> supported for security and other critical issues only, which is the
>> same for pretty much every project / product out there.
>>     
> Oh, it's legacy is it?  Funny you should say that ... "Production =
> Legacy" then...?
>
>
>   
---->  http://flashback.sorbs.net/packages/freebsd-page.jpg
>
> Oh wait... it's support ... lets look at what the "support lifecycle"
> says on it..
>
>
>
>   
----> http://flashback.sorbs.net/packages/freebsd-support.jpg

>
>
>
>
>   
>>>> 10.x has a totally different ZFS IO scheduler for example, so its
>>>> differently for most workloads.
>>>>         
>>> But the user is on 9.x not 10.x and 10.x changes a lot more than just
>>> the ZFS IO scheduler.  If this is a production machine, then an upgrade
>>> to 9.3 may be easier as it would require less regression testing....  Or
>>> is this another case of people don't run FreeBSD in production
>>> environments so it doesn't matter...?
>>>       
>> Yes but 9.x is already legacy and becomes unsupported in December of
>> this year, so the process of migration to 10.x should be well on the
>> way by now tbh.
>>     
>
> So is 10.1 and 10.2 then... Oh so that will be why you're telling them
> to upgrade to a non-supported beta release....!
>   

See: http://flashback.sorbs.net/packages/freebsd-support.jpg

> Seriously...!
>
>
> (Sorry for the html email with jpegs embedded, hate it myself -
> especially to mailing lists, but a picture is worth a 1000 words
> especially when screen grabbed from a few minutes ago...)
>
>   


-- 
Michelle Sullivan
http://www.mhix.org/