[Users] ZFS vs ploop

[Gena Makhomed]

On 22.07.2015 21:02, Scott Dowdle wrote:

>> Compare two situations:
>>
>> 1) Live migration not used at all
>>
>> 2) Live migration used and containers migrated between HN
>>
>> In which situation possibility to obtain kernel panic is higher?
>>
>> If you say "possibility are equals" this means
>> what OpenVZ live migration code has no errors at all.
>
> This is silly logic.

Why?

The less parts of kernel you use - the less possibility
to got kernel panic. If first case use only 25% of kernel code
and second variant use 50% of kernel code and if we suppose
what bugs are distributed uniformly - in second case
we have 2x possibility to got kernel panic.

I know this by writing unit tests: when making my code 100%
covered by unit tests - the most bugs I found in last 2% of code.

Until some code fragments/branches not used in unit tests
- I can't see and feel bugs exists in such code fragments.

> I could easily reproduce:

> Compare two situations:
>
> 1) Don't run any containers
>
> 2) Run some containers
>
> In which situation possibility to obtain kernel panic is higher?

in (2)

> If you say "possibility are equals" this means what OpenVZ container code
> has no errors at all.

I can't say this.

-- 
Best regards,
  Gena