[Users] OpenVZ and ZFS excellent experience

[Devon B.]

It is also important to note that there is wasted space with ZFS as is 
right now if you use advanced format drives (usually 2TB or larger).  
When using ashift=12 (4k sector size) to create a ZFS raid, you'll lose 
about 10-20% of your disk capacity with ZFS depending on the RAID type, 
I don't remember if this affects stripes or not.  It is most noticeable 
in my testing on a RAIDZ2.  When using ashift=9 (512 sector size), 
you'll have the full capacity but performance will suffer on advanced 
format drives.

  I've also opened up a performance bug about the write performance and 
amount of data written to the devices far exceeding the initial write 
size which seems to be pretty noticeable when your writes don't align 
perfectly with the zfs block size.   I had an email with you about this.

However, there are a lot of useful features in ZFS that may, or may not, 
be worth this capacity loss and write performance limitations depending 
on your use case.  I have hopes the performance issues are being worked 
out with the upcoming releases.

> Pavel Odintsov <mailto:pavel.odintsov at gmail.com>
> Friday, January 9, 2015 3:39 PM
> 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!
>
> 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!
>
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