Hi Mike,
Thanks for the responses. You mentioned earlier in the
thread I could use mmr.pl to initialize (only) a
consumer. I don't see that option with the tool; only
"create", "remove" and "display". I noticed the create
function calls three other functions,
"config_supplier", "add_rep_agreement", and then
"initialize".
If I want to initialize only, do I need to re-create
the agreements?
I tried modifying it to have an --init option with
only the "initialize($host1, $host2) function being
called, but kept getting the mmr usage, and wasn't
sure if its possible to do an initialize only.
Thanks,
Jim
--- Mike Jackson <mj(a)sci.fi> wrote:
Gordon Messmer wrote:
> Chris St. Pierre wrote:
>> You'll want to set up two-way replication
agreements between each pair
>> of hosts in your setup. So if you had A, B, C,
and D, you'd set up
>> agreements between A-B, A-C, A-D, B-C, B-D, and
C-D.
>>
> The documentation contradicts
you. Look at the
second figure in the
> "Multi-Master Replication" section of the admin
manual (hard to see),
> and the section "Configuring 4-Way Multi-Master
Replication" several
> pages below it:
>
http://www.redhat.com/docs/manuals/dir-server/ag/7.1/replicat.html#1101818
> The admin manual suggests a
ring topology (and two
agreements per set of
> peers) for multi-master agreements. You should
have agreements between
> A->B, A->D, B->A, B->C, C->B, C->D, D->C, and
D->A.
Ring-topology survives 1 server failure, but not
two. You need to
understand your high-availability requirements to
decide which is right
for you.
Full-mesh replication supports 2 servers failing at
the same time, but
increases replication traffic.
Mininum level of agreements for 4-way MMR:
1 <-> 2
1 <-> 3
2 <-> 4
Maximum level of agreements (full-mesh) for 4-way
MMR (each machine
replicates to 3 targets):
1 <-> 2
1 <-> 3
1 <-> 4
2 <-> 3
2 <-> 4
3 <-> 4
Again, it's much easier to visualize when you draw
numbered boxes on
paper and connect the dots :-)
The systems I design require high-availability for
writes, so I use
full-mesh MMR.
--
mike
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