[PVE-User] ZFS on shared storage?

[Martin Marenz]

Hi,

thanks for your answer.

Am 25.02.2014 12:40, schrieb Michael Rasmussen:
> On Tue, 25 Feb 2014 12:03:01 -0500
> Martin Marenz <martin.marenz at itp.uni-leipzig.de> wrote:
>
>> It is possible to use ZFS storage in such configuration, instead of a
>> shared lvm storage for the KVM guests.
>> And if it is possible, it is a good idea? have anybody experience with it?
>>
> Yep. Support for using ZFS is built-in.
> http://pve.proxmox.com/wiki/Storage:_ZFS
That was the reason for my question.
But does it also work if storage is attached directly to several nodes
so that one can live migrate
the kvm guests in the same way it is possible for a shared lvm storage ?
>
> I have a ZFS storage array running on commodity hardware (Stripped
> mirror on SATA2) which seems to give more than double the performance
> compared to a 3 node ceph cluster running on enterprise hardware. See
> attached screendump from crystalmark from a VM running Windows 7.
>
> CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo
>                            Crystal Dew World : http://crystalmark.info/
> -----------------------------------------------------------------------
> * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
>
>            Sequential Read :    92.061 MB/s
>           Sequential Write :    83.432 MB/s
>          Random Read 512KB :    91.106 MB/s
>         Random Write 512KB :    80.351 MB/s
>     Random Read 4KB (QD=1) :     7.883 MB/s [  1924.5 IOPS]
>    Random Write 4KB (QD=1) :     7.473 MB/s [  1824.5 IOPS]
>    Random Read 4KB (QD=32) :    44.840 MB/s [ 10947.2 IOPS]
>   Random Write 4KB (QD=32) :    43.651 MB/s [ 10656.9 IOPS]
>
>   Test : 100 MB [E: 1.0% (58.7/6141.0 MB)] (x5)
>   Date : 2014/02/25 18:39:07
>     OS : Windows 7 Enterprise Edition SP1 [6.1 Build 7601] (x64)

That sound promising.

Thanks
Martin Marenz