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 (<elacu...@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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