[Users] OpenVZ and ZFS excellent experience

[Kirill Korotaev]

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
>>> _______________________________________________
>>> Users mailing list
>>> Users at openvz.org
>>> https://lists.openvz.org/mailman/listinfo/users
>> 
>> 
>> _______________________________________________
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> 
> 
> 
> -- 
> Sincerely yours, Pavel Odintsov
> 
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