Re: ocfs2+drbd two-primary

On Wed, Dec 26, 2012 at 11:47 PM, Atıf CEYLAN <mehmet@atifceylan.com> wrote:

On Wed, 2012-12-26 at 23:12 +1100, Igor Cicimov wrote:

Maybe try heartbeat if tou are after something simple. Using dual primary though without fencing is asking for trouble, split brain and lost od data.

Yes. maybe I will encounter a split brain problem. I had asked the first question for this very reason. I have a similar problem with GlusterFS. But drbd and ocfs2 are block device level software, I think so that won't be problematic as GlusterFS.
Also please, could you make "reply all"?

I haven't used ocfs2 so I can't comment on it, but from what I could read it handles split brain situations better than gfs2 and doesn't require fencing. The gfs2, as an alternative to ocfs2, apart from fencing requires cman configuration as well. But you say you are not happy with your tests with ocfs2 ...

I would say the best place for your question is the Linbit drbd mailing list. I'm sure you'll find more competent answers there from people using various setups in production.

At the end of the day there isn't any 100% secure option in the free software world. If you want it, you need to spend some money on hardware appliance like NetApp lets say or Veritas or similar.

On 26/12/2012 2:35 PM, "Atıf CEYLAN" <mehmet@atifceylan.com> wrote:

You are saying me that use HA and you have a master file system and share from on it via NFS to the other server. is that right?
I tried some scenarios about cluster. GlusterFS, NFS and OCFS2. My system daily load is very highly. It's over 50 million transactions daily. So nfs and glusterfs are not great working under the real load. ocfs2 is best solution for me. Because I have many small files and GlusterFS and NFS can not great work with many small files (or many write operations). When ocfs2 use be without drbd, it does go haywire at any fault or crash situation. So I want to try ocfs2+drbd.

On Wed, 2012-12-26 at 12:02 +1100, Igor Cicimov wrote:

Then you dont need cluster at all do you. Or maybe you dont understand what cluster really means and provides. If you just need apps running on two nodes without any management software then use simple load balancing. Maybe even a NAS providing nfs mount for the mail storage instead of drbd.