[pve-devel] LXC volumes on ZFS over iSCSI

[Alexandre DERUMIER]

>>That and that you have to use hard locking to garanti against data
>>loss. The hard locking is the part which can bring any server down if
>>the nfs server connection hangs in any way.

>>Add to that that it is very difficult to make a high available NFS
>>server since client locks are stored in kernel mode.

Yes, sure. That's why netapp share nfs sessions across controllers.
But indeed, I don't known if they are good opensource implementation of HA nfs.

When I had my nexenta zfs san, I was using iscsi.

The only problem was the number of luns exposed on hosts, because I had all luns of all vms on alls hosts.
(so between 500-700luns), and multipath daemon was cpu crazy.




----- Mail original -----
De: "datanom.net" <mir at datanom.net>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mercredi 12 Octobre 2016 07:44:25
Objet: Re: [pve-devel] LXC volumes on ZFS over iSCSI

On Wed, 12 Oct 2016 05:41:26 +0200 (CEST) 
Alexandre DERUMIER <aderumier at odiso.com> wrote: 

> 
> Well, this is very dependent of nfs server implementation quality. 
> I'm running vm on netapp san though nfs 4.1, and I have very good performance. 
> 
netapp is a purpose build NFS based storage appliance with their own 
customized NFS server so netapp is an exception to the rule. 
> I think the biggest problem is lack of fstrim/discard. (should be availble in the future nfs 4.2) 
> 
That and that you have to use hard locking to garanti against data 
loss. The hard locking is the part which can bring any server down if 
the nfs server connection hangs in any way. 

Add to that that it is very difficult to make a high available NFS 
server since client locks are stored in kernel mode. 

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