Command-line Consumer Initialization

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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




[Index of Archives]     [Fedora User Discussion]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [Fedora News]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Maintainers]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Legacy]     [Fedora Desktop]     [Fedora Fonts]     [ATA RAID]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Centos]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora QA]     [Fedora Triage]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Tux]     [Yosemite News]     [Yosemite Photos]     [Linux Apps]     [Maemo Users]     [Gnome Users]     [KDE Users]     [Fedora Tools]     [Fedora Art]     [Fedora Docs]     [Maemo Users]     [Asterisk PBX]     [Fedora Sparc]     [Fedora Universal Network Connector]     [Fedora ARM]

  Powered by Linux