[CTDB] some basic info how clustering grew up historically in the open source world

[Michael Adam]

On 2014-12-31 at 18:43 +0100, Michael Adam wrote:
> Hi Günter,
> 
> On 2014-12-30 at 17:13 +0100, Günter Kukkukk wrote:
> > 
> > the former thread about "Setting up OCFS2 and VMs" IMO got
> > too much focused on OCFS2 - so i would like to start fresh here
> > with some more global view in mind.
> 
> Compared to setting up the cluster file system,
> setting up CTDB on top is (or should be) a piece
> of cake. All the complicated stuff (like quorum,
> fencing, etc) is delegated to the cluster/filesystem.
> 
> > For all who want to read about the historically backgrounds of
> > clustering in the open source world, i think this is a good start:
> > 
> > https://alteeve.ca/w/History_of_HA_Clustering
> > 
> > It does *not* mention CTDB at all,
> 
> Well, CTDB's focus is not so much HA but scale-out.
> HA is rather a side effect, but if you don't want
> all-active clustering of SMB, you can do without ctdb.
> 
> Also, CTDB is not a general purpose piece of clustering
> infrastructure, but specifically designed to cluster
> SMB as provided by Samba. The fact that CTDB also comes
> with small cluster-management system stems from the fact
> that at the time when CTDB was created (around 2007), there
> was no pacemaker around or anything else to manage all-active
> services in a cluster. But nowadays CTDB can in principle
> also be run in a database-only mode without doing IP failover
> and management of samba and friends, and have itself managed
> by pacemaker.

I forgot to say:

All that being said, it would of course be nice
if CTDB would get a little more recognition in
the Linux/OpenSource HA (and SO) clustering world!

> > but (probably) we need to add some
> > additional pieces to get CTDB running on a clustered file system...
> > (on different distros)
> 
> What do you mean here? CTDB has been deployed successfully
> on several clustered file systems since its beginnings in 2007.
> Examples are GPFS, GlusterFS, GFS2, OCFS2, and (I think) CephFS.
> 
> Again, if the File System is set up properly, then setting up
> CTDB top is really really easy. At least it was last time I tried...
> 
> Cheers - Michael


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