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In order to avoid having to setup a NAS system, I am considering the possibility of setting up a dual-primary with DRBD to handle RAID1 over IP.

Concerning filesystems, I know of OCFS and GFS as distributed filesystem. I am leaning towards OCFS as that seems like the more reliable option.

Do you have any production experience with such a system ? Am I heading towards trouble ? What should I expect/plan ?

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With what protcol do you want to provide your NAS service and why do you need the dual primary mode for this? –  Nils Jan 1 '12 at 20:32
    
NAS would be NFS. I need it for redundancy :) –  Antoine Benkemoun Jan 2 '12 at 7:21
    
And you want to run a NFS-server on both sides with the same ip (else the NFS-handle for the same file will be different on both nodes)? Then you need a load-balancer in front of that construction. For NFS you should rather fail over (active/passive) and run halv of the nfs-exports on one side, the other one on the other side. –  Nils Jan 2 '12 at 22:08

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