On 10/23/2013 02:46 PM, Gregory Farnum wrote: > Ah, I see. No, each CephFS client needs to communicate with the whole > cluster. Only the POSIX metadata changes flow through the MDS.
Yeah, I thought you'd say that. Back in February I asked if I could get a cephfs client to read from a specific osd, localhost in my case, and was given to understand that the whole point of cephfs is that it won't. > It is better to make such issues technically difficult or impossible, > than to make them legal requirements — being able to sue the guy > running 3 VMs for his side project doesn't do much good if he's > managed to damage somebody else. Well, you can't, can you? If every client is banging on every osd, the amount of damage it can potentially do is non-deterministic with upper bound of "the entire storage infrastructure". At which point suing anybody won't help indeed. All I need to do is subvert one "trusted" hypervisor, and then your "the entire storage infrastructure" is just as dead. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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