replication groups

Brad Fitzpatrick brad at
Tue Nov 22 21:44:18 PST 2005

Changing the replicator logic is very self-contained and easy to modify.
A power-strip group or cabinet group or data center (city) group would be
pretty easy, and we'll probably be adding that in the next few months
if/when we go multi-datacenter....

On Tue, 22 Nov 2005, Eric Lambrecht wrote:

> Has anybody tried to build out any kind of 'replication groups' for
> mogilefs, where you can define something like "when keeping multiple
> copies of a file, make sure copy 1 goes somewhere in this set of hosts,
> copy 2 goes in this set of hosts, where those host sets don't overlap?"
> I'm concerned that copies of a single file will end up stored on a set
> of machines that all share the same power strip... so if that strip
> goes, out, we're kind of fubar'ed for a while.
> We're also hoping that if we could group the replications, this might
> help us for a move to a new datacenter - we'd be able to take down and
> move 1/2 of the machines while things continue to run on the remaining
> half (assuming you only keep 1 copy of everything).
> Eric...
> (p.s. - saw Brad's livejournal post on the device balancing... very nice...)

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