I understand that, so I would like to know: Is there a way to share a partition with several machine without going into clustered FS way? What about NTFS between 2-3 machines?
Thanks, Hetz 2010/8/22 Ed Cashin <ecas...@coraid.com> > On Aug 20, 2010, at 7:55 PM, Hetz Ben Hamo wrote: > ... > > Hello, > > I have some really bizarre behavior with AOE. > > The behavior doesn't have to do with AoE so much as the use > of a traditional, non-cluster filesystem from more than one host, > which isn't something you can do without having things go wrong. > > (More comments appear below.) > > ... > > The problem: When I change a file in 1 machine, I don't see the changes > on > > the other machine, same thing happens when I try to erase/rename files, > copy > > etc. > > When a host mounts a filesystem, it keeps filesystem information > in RAM as well as on persistent storage. It assumes that the info > in RAM is the same as the info on persistent storage so that it can > avoid unnecessary I/O. > > In a cluster filesystem like GFS, hosts communicate with one another > to let one another know when these assumptions are not valid, but > with a traditional filesystem like ext2, there is no such mechanism. > It's a single-host filesystem design. > > When you try to mount a filesystem from two hosts and they each > wrongly assume, "I'm the only one mounting this filesystem," the > info in their RAM does *not* match the info on persistent storage. > Then you wind up with corrupt data on the persistent storage, as > host A writes things that make sense only based on the info it has > in RAM, even though host B has changed the persistent copy of > that info! > > -- > Ed Cashin > ecas...@coraid.com > > -- my blog (hebrew): http://benhamo.org Skype: heunique MSN: hetz-b...@benhamo.org
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