Re: distributed cluster

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On Wed, May 30, 2012 at 4:47 AM, Jerker Nyberg <jerker@xxxxxxxxxxxx> wrote:
> I am waiting as fast as I can for it to be production ready. :-)

I feel like starting a quote of the week collection ;)

One more thing I remember is worth mentioning: Ceph doesn't place
objects "near you", CRUSH is completely deterministic based on the
object name. Hence, your worst case may actually look like this:

sites: west, east
servers: a,b in west; c,d in east
client: x in west

Write from client, with bad luck, will go
x->d, replication: d->a, d->b

Now you've used 3x bandwidth on the WAN.


Currently, the only way to work around this is with pools, and there's
nothing automatic about that.
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