[PVE-User] Create proxmox cluster / storage question.

Leandro Roggerone leandro at tecnetmza.com.ar
Mon Mar 2 14:37:53 CET 2020


Thanks for the feedback!

El lun., 2 mar. 2020 a las 5:21, Ronny Aasen (<ronny+pve-user at aasen.cx>)
escribió:

> On 28.02.2020 15:25, Leandro Roggerone wrote:
> > Dear Eneko:
> > When you talk about redundacy and availability, do you want...
> > - HA? (automatic restart of VMs in the other node in case one server
> fails)
> > - Be able to move VMs from one server to the other "fast" (without
> > copying the disks)?
> > Yes , this is what I want.
> > So regarding my original layout from my 5.5Tb  storage:
> > Im using 1T for LVM , 1TB for LVM-thin and  3.5 TB unassigned space, is
> it
> > ok to use this unassigned space for a ceph ?
> > Can I set it later ?  with server on production ?
> >
> > Other:
> > Using an NFS system, means to have an external server running a file
> sistem?
> > So you should have at least two servers for the cluster and one for the
> > file system?
> > It seems to me that using ceph has a better redundancy plan an it is
> easier
> > to deploy since I only need two servers. (am i right?).
> > Thanks!
> >
> > El vie., 28 feb. 2020 a las 11:06, Eneko Lacunza (<elacunza at binovo.es>)
> > escribió:
> >
> >> Hola Leandro,
> >>
>
>
> for NFS you have just moved your SPOF from proxmox to NFS. so unless you
> have a HA NFS solution like a SAN with controller failover i would not
> think about NFS.
>
> for ceph you need 4 server to a have a proper fault tolerant HA system
> you have 3 copies of data. and a node as a failuredomain. you want the
> disk layout to be fairly identical on the servers.
>
> you can in theory run ceph on 3 nodes, but you will have a degraded
> cluster when you loose a node. and basically neuter the best features of
> ceph. so use 4 or more nodes. ceph really shines when you get to 8-10
> nodes. also most defaults assume a 8 node cluster, so you may need to
> tweak some warning levels when you want to run with fewer.
>
> Also proxmox HA requires quorum. so proxmox also need 3 or more nodes.
> if you only have 2 nodes you can not do a reliable HA solution. But you
> can do a zfs replication system, where the running vm is replicated to
> the other server periodically. and you can start that backup vm when the
> main one dies.
>
> Good luck
> Ronny Aasen
>
>
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