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Except that the POSIX bit of Ceph is considerably less polished than the rest of it, at the moment. Things to rule out: AFS. Things that might work: the usual suspects, in general (Lustre is fine, although doesn't automanage redistribution of storage across nodes, at present, so removing a volume is harder than adding one - but anything that *does* make removal of storage trivial also replicates / adds redundant blocks via parity, so you actually "lose space" to replicas etc). So, on that note: do you have money to overprovision storage beyond the bare needs (that is, can you afford to buy 3 times as much storage as you need, so you can run an HDFS system with the standard 3 replicas of each block)? Sam On 5 November 2013 13:08, james Adams <[log in to unmask]> wrote: > CephFS-- > Scanned by iCritical.