Hello, Since this is my first note to the group, I'll introduce myself first. I am Lindsay Todd, a Systems Programmer at Rensselaer Polytechnic Institute's Center for Computational Innovations, where I run a 1.2PiB GPFS cluster serving a Blue Gene/Q and a variety of Opteron and Intel clients, run an IBM Watson, and serve as an adjunct faculty. I also do some freelance consulting, including GPFS, for several customers.
One of my customers is needing to serve GPFS storage through both NFS and Samba; they have GPFS 3.5 running on RHEL5 (not RHEL6) servers. I did not set this up for them, but was called to help fix it. Currently they export NFS using cNFS; I think we have that straightened out server-side now. Also they run Samba on several of the servers; I'm sure the group will not be surprised to hear they experience file corruption and other strange problems. I've been pushing them to use Samba-CTDB, and it looks like it will happen. Except, I've never used this myself. So this raises a couple questions: 1) It looks like RHEL5 bundles in an old version of CTDB. Should that be used, or would we be better with a build from the Enterprise Samba site, or even a build from source? 2) Given that CTDB can also run NFS, what are people who need both finding works best: run both cNFS + Samba-CTDB, or let CTDB run both? It seems to me that if I let CTDB run both, I only need a single floating IP address for each server, while if I also use cNFS, I will want a floating address for both NFS and Samba, on each server. Thanks for the help! R. Lindsay Todd, PhD
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