Hi Joakim,
On Mon, Dec 5, 2016 at 1:35 PM <joakim@xxxxxxxxx> wrote:
Hello,
I have a question regarding if Ceph is suitable for small scale
deployments.
Lets say I have two machines, connected with gbit lan.
I want to share data between them, like an ordinary NFS
share, but with Ceph instead.
My idea is that with Ceph I would have redundancy with two machines
having complete copies of the data. I also imagine that the
performance could be quite okay in principle, depending on how Ceph
works, which I'm not quite sure of.
A use case would be to share my home directory on two machines, or
three maybe.
A workload I'm concerned with is software builds. Would Ceph be
competetive in this use-case as compared with a local disk? As far as
I can tell Ceph doesn't use the "eventual consistency" approach. Does
that mean that all writes have to sync over all the nodes in the Ceph
cluster, before the write can be considered complete? Or is one node
enough?
/Joakim
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I have done such setups with one high quality machine. If stability is a concern, without an absolute requirement for multi head node, simple is a really good approach. You would have to assess downtime requirements, but I can tell you that we have over 30 24/7 systems out there running not much more that NFS on ZFS, and these are great workhorses, with little or no downtime.
HA features to set up - good RAID controller (we like Areca), bonding, ideally with 10GbE or more - active/backup or LACP. ECC RAM, and monitor the hardware. Take good backups.
I have a decent lab Ceph setup with 3 OSD nodes and virtual machines as MONs, but running off different storage. I would not do Ceph with 2 OSD nodes.
As Christian replied, DRBD has been widely used for two node setup.
Good luck!
Alex
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