[pve-devel] ceph osd over zfs volume

Alexandre DERUMIER aderumier at odiso.com
Fri Apr 18 08:28:12 CEST 2014

>>If you want to manage OSDs on ZFS, please also provide patches to make the GUI
>>able to manage that.

Please note that ceph/intank don't support zfs currently.

So, it could be buggy, be carefull.

----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Paul Penev" <ppquant at gmail.com>, pve-devel at pve.proxmox.com 
Envoyé: Jeudi 17 Avril 2014 15:00:59 
Objet: Re: [pve-devel] ceph osd over zfs volume 

> >> It is difficult to believe that using slices (or partitions) makes 
> >> administration difficult. 
> > 
> > It is also difficult to believe that zfs is useful here. 
> It is actually easier when you consider a typical proxmox cluster with openvz and 
> kvm machines and recall that openvz currently requires simfs (btw: ploop is out 
> of beta not and could be supported too). 
> In a small cluster that runs a mixed load, there is no space for allocating entire 
> disks to ceph. There is no need for that too. The key here is small: 3 to 6 nodes 
> total. 

Sorry, but you need at least 12 OSD to get reasonable performance. 
So you small clusters you need at least 4 Disks per node. 

Ceph people recommends at least 100 OSDs (one hundred) 

> >> To me this is a limiting factor without a tangible advantage. 
> > We do not set any limits on ceph - you can use the original packages like you 
> want. 
> Following the same reasoning I could use openvz and kvm+qemu without 
> proxmox at all. I have done this is the past, but shall I do so now? 
> What I am talking about is making proxmox a better fit for a more general 
> purpose. 
> Che choice to limit osd to physical disks when there is no such limitation in the 
> underlying technology is a plain arbitrary choice (political choice if you wish) 
> which is actually removing from the potential customer base and not adding to 
> it. 
> I really do not understand. 

No, it is not a plain arbitrary choice - we provide a GUI for that! 

If you want to manage OSDs on ZFS, please also provide patches to make the GUI 
able to manage that. 

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