On 14/03/18 11:47, Clay Gerrard wrote:
On Tue, Mar 13, 2018 at 3:05 PM, Mark Kirkwood
To me this suggests that a certain minimum number of *hosts* per
region is needed for a given EC policy to be durable in the advent
of host outage (or destruction). Is this correct - or have a
flubbed the calculations?
Looks correct to me. Ideally you'd have more nodes per region than
k+m; otherwise a reboot would mean WAN traffic - or if that's not
possible - temporary unavailability.
Doing a bit more playing about leads me to think that for a *single
region* EC policy we can get a tighter lower bound on the number of
hosts: I'm calculating it as (k+m)/m. So in the case I was playing with
before (k=8, m=2), then I need 5 hosts in my region. While testing does
seem to support this, does it sound reasonable?
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