On Sat, 2008-04-05 at 09:52 +1100, Crossfire wrote: > I've just spent some time quickly researching this to no real satisfaction. > > What I'm looking for is a way to do real-time hot-replication of a whole > filesystem or filesystem tree over 2 nodes (and strictly 2 nodes) > without STOMITH[1]. > > The scenario is I have two identical systems with local (software) > RAID1. They will be tethered onto their internet feed via ethernet, and > can optionally be tethered to each other via Gig. > > I want to be able to set it up so /home (and maybe other filesystems) > are replicated from one to the other, in both directions, in real time > so they can run in an all-hot redundant cluster. > > The environment should be mostly read-oriented, so I can live with > write-latent solutions as long as they handle the race/collision > gracefully (preferably by actually detecting and reporting it if they > can't avoid it). > > The options I've investigated so far: > > * Lustre (MDS requirements[2] make this not an option) > * GlobalFS (STOMITH requirements make this not an option. Oriented > towards shared media too, which I am not using) > * tsync (Naive concurrent operation model, but otherwise viable) > * MogileFS (not quite what I was looking for, but none the less useful). > * OpenAFS (read-only replication only, loss of the node hosting the > write volume still renders the volume unwritable). > > Is anybody aware of any other options that I've missed?
http://sourceforge.net/projects/ceph/ -Rob -- GPG key available at: <http://www.robertcollins.net/keys.txt>.
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