gluster questions

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I'm thinking about implementing gluster as a possible way of home directory server redundancy(using the afr translator), but I have a few questions that I can't seem to find the answer to:

-Does installing gluster require a total format of the "bricks" or data volumes involved? Can I just install it over the current system and keep data intact? From what I read it just works over the current filesystem (ext3, xfs, etc)?

-We currently have a single node w/fibre channel raid (partitioned into 7 luns for different user groups) for our home directories. All exported using NFS. We are getting in a new server and raid unit, which will become the primary server once it is setup. Can I setup the new server and raid as a single gluster node, get the data copied over (via rsync or something similar), move clients over to the new machine, then resetup the old server/raid combo and add it into the gluster system? Or is there a better way to do this?

-Concerning NFS and tied into the above question: we use it for it's compatibility with Mac, Linux and Solaris workstations and has worked fairly well. We'd like to stick with it. Would that require running a fuse/gluster client on one of the above nodes and re-exporting it as NFS? That is the way I seem to understand from my searches on the mailing lists. Or can you directly export a gluster brick via nfs? And if running the fuse/gluster client on one of the server nodes w/ exported NFS is necessary, is this a safe way to do things?


Any helpful hints, tips or different ways of thinking about things is appreciated.


Jon


p.s. sorry for all of the questions...I'm a bit new at attempting filesystem/service redundancy






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