Thanks guys. That helped a lot. --- Regards, Dmitriy
On Fri, Jan 10, 2014 at 5:44 AM, Miroslav Anashkin <[email protected]>wrote: > Hi Dmitriy, > > A1. Yes, MySQL+Galera is true master-master solution. While it is possible > and, in case of 6+ nodes even recommended, to set 1-2 Galera nodes as > slaves - for additional data consistency. > Previous Fuel versions use HAProxy as MySQL managing solution. > In case of Mirantis OpenStack (starting from 3.0 or 3.1) MySQL+Galera > cluster is managed by Pacemaker. > There is no single master node in Galera cluster at all - there are nodes > with most recent data replica and nodes which still have to sync with this > recent replica. > Workflow is simple. Node serves new data changing request and increases > its UUID number. All the other nodes must synchronize data with all the > nodes with UUID greater than current. > > A2. Yes, CEPH monitors are also master-master. One of them is > periodically becomes a leader. Leader is the node, which got the most > recent cluster map replica first. Other monitor nodes must sync they > cluster map with current leader. Every monitor node already synced with > leader becomes provider and leader knows which nodes are currently > providers. So, leader also tells the other nodes which provider each of > them should use to get data from. > CEPH monitor synchronization algorithm works similar way as Galera, but > CEPH nodes are parted by functionality to monitor nodes and data storage > nodes. In turn, every Galera node has all the same service set on each node. > So, CEPH monitor nodes only manage where the data should be actually > stored and maintain data consistency between OSD nodes. > > > A3. Additionally to the previous answerers I may add that Neutron is a > router among the other functionality. It is the reason why there are single > entry points. > > > On Fri, Jan 10, 2014 at 12:18 PM, Dmitriy Novakovskiy < > [email protected]> wrote: > >> Hi guys, >> >> I'm currently kicking off a a project with new customer, and stumbled on >> some holes in my understanding of Mirantis HA architecture. >> >> Can you please help me understand the following: >> >> Q1. MySQL + Galera - is it an active/active HA? I was told/tend to think >> "yes", but want to understand it better. A simple workflow example would >> help >> >> Q2. ceph-mon on controllers - same question as Q1 >> >> Q3. Neutron - is it in active/standy HA? I got this understanding from >> docs and want to understand why. I was told that Grizzly and Havanna >> support multiple l3 agents, but we don't leverage it on some reason in Fuel. >> >> Thanks a lot in advance >> >> --- >> Regards, >> Dmitriy >> >> -- >> Mailing list: https://launchpad.net/~fuel-dev >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~fuel-dev >> More help : https://help.launchpad.net/ListHelp >> >> > > > -- > > *Kind Regards* > > *Miroslav Anashkin**L2 support engineer**,* > *Mirantis Inc.* > *+7(495)640-4944 <%2B7%28495%29640-4944> (office receptionist)* > *+1(650)587-5200 <%2B1%28650%29587-5200> (office receptionist, call from > US)* > *35b, Bld. 3, Vorontsovskaya St.* > *Moscow**, Russia, 109147.* > > www.mirantis.com > > [email protected] > >
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