On Thu, Apr 23, 2015 at 6:11 PM, Thorvald Hallvardsson < thorvald.hallvards...@gmail.com> wrote:
> Hi guys, > > I need some help and answers related to share GFS2 file system over NFS. I > have read the RH documentation but still some things are a bit unclear to > me. > > First of all I need to build a POC for the shared storage cluster which > initially will contain 3 nodes in the storage cluster. This is all going to > run as a VM environment on Hyper-V. Generally the idea is to share virtual > VHDX across 3 nodes, put LVM and GFS2 on top of it and then share it via > NFS to the clients. I have got the initial cluster built on Centos 7 using > pacemaker. I generally followed RH docs to build it so I ended up with the > simple GFS2 cluster and pacemaker managing fencing and floating VIP > resource. > > Now I'm wondering about the NFS. RedHat documentation is a bit conflicting > or rather unclear in some places and I found quite few manuals on the > internet about similar configuration and generally some of them suggest to > mount the NFS share on the clients with nolock option RH docs mention local > flock and I got confused about what supposed to be where. Of course I don't > know if my understanding is correct but the reason to "disable" NFS locking > is because GFS2 is already doing it anyway via DLM so there is no need for > NFS to do same thing what eventually mean that I will have some sort of > double locking mechanism in place. So first question is where I suppose to > setup locks or rather no locks and how the export should look like ? > > Second thing is I was thinking about going a step forward and use NFS4 for > the exports. However from what I have read about NFS4 it does locking by > default and there is no way to disable them. Does that mean NFS4 is not > suitable in this case at all ? > > That's all for now. > > I appreciate your help. > > This is the latest KB regarding combination of GFS + NFS that I know of, Does Red Hat recommend exporting GFS or GFS2 with NFS or Samba in a RHEL Resilient Storage cluster, and how should I configure it if I do? https://access.redhat.com/solutions/20327
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