[Linux-cluster] Data Loss / Files and Folders "2-Node_GFS-Cluster"

[Doug Tucker]

> I don't (or "didn't") have adequate involvements with RHEL5 GFS. I may 
> not know enough to response. However, users should be aware of ...
> 
> Before RHEL 5.1 and community version 2.6.22 kernels, NFS locks (i.e. 
> flock, posix lock, etc) is not populated into filesystem layer. It only 
> reaches Linux VFS layer (local to one particular server). If your file 
> access needs to get synchronized via either flock or posix locks 
> *between multiple hosts (i.e. NFS servers)*,  data loss could occur. 
> Newer versions of RHEL and 2.6.22-and-above kernels should have the code 
> to support this new feature.
> 
> There was an old write-up in section 4.1 of 
> "http://people.redhat.com/wcheng/Project/nfs.htm" about this issue.
> 
> -- Wendy
> 
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Wendy,

To be clear, does this include RHEL 4.7, or is it specific to 5.x?