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GPFS initial setup, but perhaps this is a SAN/VIO question

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http://www.unix.com – I'm having some trouble getting a POC of GPFS up and running. I've read a couple install guides including a couple IBM pdfs but I'm getting stumped on something I think is fairly fundamental.... I'm trying to do this all on a single 795, right now only the VIOs have HBAs so all LUNs are pointed to those HBAs. Can I simply go into the HMC and double allocate the LUN (assign the slot to two or more LPARs) and expect that to work? Do I need to install a few more HBAs, allocate them to the individual LPARs and then have the SAN folks double or triple assign the LUNs to corresponding HBAs that w (HowTos)