cyrus replication : master to replica and replica to master
carson at taltos.org
Fri Oct 23 16:32:52 EDT 2009
On 10/23/09 7:42 AM, David Carter wrote:
> On Fri, 23 Oct 2009, Bron Gondwana wrote:
>> I've seen heartbeat get split brain before. We gave up on it. We do
>> all our fencing via humans now! Check the KVM, kick the box, manually
>> run the failover script.
> Some of my colleagues have had a lot of grief with Heartbeat going split
> brain. It seems to really be designed for a pair of machines sitting next
> to each other in a rack with a serial link for the heartbeat, rather
> servers installed in a pair of machine rooms three miles apart.
To be fair to heartbeat, if you're getting unexpected split brain, then you have
configured it incorrectly. A 2 node cluster without _extremely_ reliable
communication and fencing between the nodes requires a tie-breaker service. This
is true of any clustering technology I have ever seen. Heartbeat provides a
light-weight quorum service for just this purpose.
Of course if you only have 2 sites, and the site with the "extra" vote goes
down, you lose the service. Anything else requires 3 sites, or a "meatware"
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