On 23/10/14 03:32, Lindsay Mathieson wrote:
I'm playing around with GlusterFS and have a few questions. Have got a
test setup running on a 2 node cluster (using external USB Drives!)
that works surprisingly well :) and I must say it was very easy to setup.
1. I wanted to implement a distributed/replicated file system. Is
GlusterFS the best choice for a 2 node system? Would it be easy to add
a third node later?
2. When launching a VM off Node 1 or Node 2, is it accessing the local
hard disk directly, or does it all go through a network share? Our
network is only 1GB and it would be nice to take some of the load off it.
Should I be asking these question on the forum rather than the list?
Thanks,
--
Lindsay
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I'm using successfully Proxmox with GlusterFS. Each proxmox node is also
a gluster node, and now I have two nodes (using a third proxmox node on
vmware for proxmox quorum). I must say it works pretty nice, I even
provide Windows VDIs with this system. Adding a third (with a fourth
-it's a replica, you know-) and more nodes, it's pretty straight
forward. Just prepare them, add to the gluster and the data will be
rebalanced, with a 10Gb network, the data will be rebalanced hugely
faster than with a 1Gb network.
I also suggest to you to use a better network because glusterfs writes
are synchronous. The benefit of this is that if one node comes down, all
the information is in the other node, so there are chances that the VMs
even didn't notice when a node comes down.
When you write on gluster, even you have mounted it using the IP of one
of them, the writes are "randomly" (not really random) send to any node,
and then, replicated amongst them, it's the internal operation.
You could set up a georeplica instead a replica, designed to replicate
two gluster clusters amongst remote offices, and then you could use your
1Gb network to make asynchronous writes. The cons I see are you don't
have *exactly* the same data on the both clusters at each time, and in
case of a node comes down, you should reconfigure all VMs to point their
disks to the other GlusterFS, because they are two different clusters.
So, summarizing: Yes, you can use gluster in a two-node gluster setup, I
do not know if Ceph its better though, I can only share my positive
experiences with gluster. I would recommend you to use a 10Gb network
dedicated for gluster communication, it will be useful to replicate data
synchronously and essential for rebalance the data when in a future you
will need to add more nodes.
--
*Angel Docampo
*
*Datalab Tecnologia, s.a.*
Castillejos, 352 - 08025 Barcelona
Tel. 93 476 69 14 - Ext: 706
Mob. 670.299.381
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