Paolo, Comments are inlined. On Wed, Sep 17, 2008 at 3:25 PM, Paolo Supino <paolo.supino at gmail.com>wrote: > Hi Keith > > There's a section on the website that gives the configuration for a > unify/AFR but doesn't say whether AFR goes above or below unify. At the > moment I don't need the whole 2TB and I can live with half of it, but I > might down the road need the extra space. If and when that happens is it > possible to break the unify/AFR and move everything to only unify without > deleting data (not that will be an obstacle, see below)? > Its recommended while adding new children to unify, the back end filesystems of children to be empty, hence you've to delete the data. > Can anyone answer the question: does AFR goes above or below unify? > It can go either way. 1. If you are using AFR over unify, then you should have two unify translators, each with n/2 children and AFR should have these two unify translators as its children 2. If you are using unify over AFR, then you should have n/2 AFR translators, each having 2 children and unify should have all the n/2 AFRs as its children. where n is the number of nodes available for glusterfs. Though the option 2 leads to huge volume specification file relative to option 1 . I am not sure about any performance setup between these two configurations. Krishna/Avati, can you confirm this? > > I don't think that the data stored on the gluster volume will be mission > critical: it 's genomic data that is being processed on the cluster. I think > that the worst case scenario in case of brick loss will be that a few hours > of processing will be lost. > > > > -- > TIA > Paolo > > > > > On Wed, Sep 17, 2008 at 12:22 PM, Keith Freedman <freedman at freeformit.com>wrote: > >> Some other things to consider: >> >> the unify is a good idea to make use of all your space. However, with >> that many nodes, your probability of a node failing is high. >> so just be aware, if one of the nodes fails, whatever data stored on that >> node will be lost. >> >> If you dont need the full 2TB's then I'd suggest using AFR. >> >> I *think* you can run afr UNDER unify, so you would create one unify brick >> with half the machines, another with the other half and AFR across them. >> but I'm not sure.. it may be that AFR has to be above Unify >> >> of course, if you don't care about the data really, i.e. it's all backup >> or working space or temp files, etc.. then no need to AFR them. >> >> Keith >> >> At 01:52 AM 9/17/2008, Paolo Supino wrote: >> >>> Hi Raghavendra >>> >>> I like your reply and definitely will give it a try. There's nothing I >>> hate mre than wasted infrastructure ... >>> >>> >>> >>> >>> >>> >>> -- >>> TIA >>> Paolo >>> >>> >>> On Wed, Sep 17, 2008 at 8:13 AM, Raghavendra G <<mailto: >>> raghavendra.hg at gmail.com>raghavendra.hg at gmail.com> wrote: >>> Hi Paolo, >>> >>> One of the configurations is to have glusterfs as server on each of the >>> nodes exporting a brick. Each node should also have glusterfs running as >>> client having unify translator, unifying all the servers. >>> >>> regards, >>> >>> On Tue, Sep 16, 2008 at 10:34 PM, Paolo Supino <<mailto: >>> paolo.supino at gmail.com>paolo.supino at gmail.com> wrote: >>> Hi >>> >>> I have a small HPC cluster of 36 nodes (1 head, 35 compute). Each of the >>> nodes has a 1 65GB (~ 2.2TB combined) volume that isn't being used. I >>> thought of using a parallel filesystem in order to put this unused space >>> into good use. The configuration I had in mind is: All nodes will act a >>> bricks and all nodes will act as clients. I have no experience with Gluster >>> and want to know what people on the mailing list thought of the idea, >>> deployment scenario, pros and cons etc ... Any reply will help :-) >>> >>> >>> >>> -- >>> TIA >>> Paolo >>> >>> >>> _______________________________________________ >>> Gluster-users mailing list >>> <mailto:Gluster-users at gluster.org>Gluster-users at gluster.org >>> http://zresearch.com/cgi-bin/mailman/listinfo/gluster-users >>> >>> >>> >>> >>> -- >>> Raghavendra G >>> >>> A centipede was happy quite, until a toad in fun, >>> Said, "Prey, which leg comes after which?", >>> This raised his doubts to such a pitch, >>> He fell flat into the ditch, >>> Not knowing how to run. >>> -Anonymous >>> >>> >>> _______________________________________________ >>> Gluster-users mailing list >>> Gluster-users at gluster.org >>> http://zresearch.com/cgi-bin/mailman/listinfo/gluster-users >>> >> >> > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://zresearch.com/cgi-bin/mailman/listinfo/gluster-users > > -- Raghavendra G A centipede was happy quite, until a toad in fun, Said, "Prey, which leg comes after which?", This raised his doubts to such a pitch, He fell flat into the ditch, Not knowing how to run. -Anonymous -------------- next part -------------- An HTML attachment was scrubbed... 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