[Users] OpenVZ and ZFS excellent experience

[Pavel Odintsov]

Hello!

Thank you! I will contact with you out off list.

On Sat, Jan 10, 2015 at 4:44 PM, Kirill Korotaev <dev at parallels.com> wrote:
> Pavel,
>
> it’s impossible to analyze it just by `du` and `df` output, so please give me access if you want me to take a look into it.
> (e.g. if I would create 10 million of 1KB files du would show me 10GB while ext4 (and most other file systems) would allocate 40GB in reality assuming 4KB block size)
>
> Thanks,
> Kirill
>
>
>> On 10 Jan 2015, at 00:54, Pavel Odintsov <pavel.odintsov at gmail.com> wrote:
>>
>> Thank you, Kirill! I am grateful for your answer!
>>
>> I reproduced this issue specially for you on one container with 2.4
>> times (240% vs 20%) overuse.
>>
>> I do my tests with current vzctl and ploop 1.12.2 (with fixed
>> http://bugzilla.openvz.org/show_bug.cgi?id=3156).
>>
>> Please check this gist:
>> https://gist.github.com/pavel-odintsov/b2162c0f7588bb8e5c15
>>
>> I can't describe this behavior without complying on ext4 data.... But
>> I I will be very happy if you fix it :)
>>
>> On Sat, Jan 10, 2015 at 12:29 AM, Kirill Korotaev <dev at parallels.com> wrote:
>>>
>>>> On 09 Jan 2015, at 21:39, Pavel Odintsov <pavel.odintsov at gmail.com> wrote:
>>>>
>>>> Hello, everybody!
>>>>
>>>> Do somebody have any news about ZFS and OpenVZ experience?
>>>>
>>>> Why not?
>>>>
>>>> Did you checked my comparison table for simfs vs ploop vs ZFS volumes?
>>>> You should do it ASAP:
>>>> https://github.com/pavel-odintsov/OpenVZ_ZFS/blob/master/openvz_storage_backends.md
>>>>
>>>> Still not interesting?
>>>>
>>>> For example if you have 5Tb disk array (used up to 90%) and using
>>>> ploop now you lose about 800GB of disk space!
>>>
>>> Well, AFAIR we simply have a threshold that ploop is not compacted until it’s size is 20% bigger then it should be…
>>> Also you can try smaller ploop block size. Anyway, my point is that it has nothing to do with ext4 metadata as stated in your table.
>>>
>>>
>>>> This data is from real HWN with few hundreds of containers.
>>>>
>>>> I have excellent experience and very good news about ZFS! ZFS on Linux
>>>> team will add very important feature, linux quota inside container
>>>> (more details here https://github.com/zfsonlinux/zfs/pull/2577
>>>>
>>>> But still no news about ZFS from OpenVZ team (and even from Virtuozza
>>>> Core) and we can work separately :)
>>>>
>>>> Fortunately, we do not need any support from vzctl and can use "raw
>>>> vzctl" with some lightweight manuals from my repo:
>>>> https://github.com/pavel-odintsov/OpenVZ_ZFS/blob/master/OpenVZ_containers_on_zfs_filesystem.md
>>>>
>>>> I collected all useful information here
>>>> https://github.com/pavel-odintsov/OpenVZ_ZFS
>>>>
>>>> Stay tuned! Join to us!
>>>>
>>>> --
>>>> Sincerely yours, Pavel Odintsov
>>>> _______________________________________________
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>>>> Users at openvz.org
>>>> https://lists.openvz.org/mailman/listinfo/users
>>>
>>>
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>>
>>
>>
>> --
>> Sincerely yours, Pavel Odintsov
>>
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-- 
Sincerely yours, Pavel Odintsov