would creating a cron job for each of the nodes to where only one is workign on the files on the head node?
On Wed, Aug 26, 2009 at 2:11 AM, <madskad...@gmail.com> wrote: > Greetings, > > > I relatively new to cluster environments and I was given a small > (7nodes+1head) cluster to admin. So far I only had to maintain what > was already installed so few problems to solve (and to think on). But > new (diferent: amd opteron vs intel xeon) machines came and I have to > expand the cluster (think and solve problems). The (old) cluster is > semi-diskless (all machines do have disks but they boot from a single > image on a central server) with nfs for filesystem sharing. The main > problems I had were: > * if the /var filesystem is shared, race conditions happen (all nodes > want to write on the same files). I had this problem and moved to a > local /var filesystem. > * if /var is local (which it may because the disks do exist), the > whole point of central point for easy admin vanishes, because I would > had to create all the /var structure that packages need to work, on > each node (would be easier to do: "for $node; ssh $install_cmd; done", > than guessing which dirs I need to create or files to copy). > * if /var is tmpfs all forensics are certainly gone after failure > (Murphy told me this one ;). > > Everything I read on the subject do underline the advantages of > diskless approaches but miss to alert to this problem and/or to solve > it. On the other side, the distributed approach tools (where every > node is autonomous) seem to be halted (as systemimager - which is used > in the Oscar project) or discontinued, or truly overblown for my > reference scale (IBM's xCat); so it really seems that I'm missing > something. > > The question is what you do about this ? > > Gil Brandao > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > -- Jonathan Aquilina
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