DRBD: Desync, split-brain, como voltar
Estou enfrentando uns paus com o DRBD. Do nada ele mata o sync e fode com tudo. Meu MySQL vai para o saco, CVS para de funcionar, etc… No log mostra um split-brain error e só consigo matar o DRBD rebootando a máquina(éca, mas fazer o que?)… o que eu fiz: no drbd.conf, tem 3 linhas do arquivos de configuração em resource, net:
after-sb-0pri disconnect;
after-sb-1pri disconnect;
after-sb-2pri disconnect;
mudei para:
after-sb-0pri discard-younger-primary;
after-sb-1pri consensus;
after-sb-2pri disconnect;
segundo a documentação do DRBD:
# In case the nodes of your cluster nodes see each other again, after
# an split brain situation in which both nodes where primary
# at the same time, you have two diverged versions of your data.
#
# In case both nodes are secondary you can control DRBD's
# auto recovery strategy by the "after-sb-0pri" options. The
# default is to disconnect.
# "disconnect" ... No automatic resynchronisation, simply disconnect.
# "discard-younger-primary"
# Auto sync from the node that was primary before
# the split brain situation happened.
# "discard-older-primary"
# Auto sync from the node that became primary
# as second during the split brain situation.
# "discard-least-changes"
# Auto sync from the node that touched more
# blocks during the split brain situation.
# "discard-node-NODENAME"
# Auto sync _to_ the named node.
after-sb-0pri disconnect;
# In one of the nodes is already primary, then the auto-recovery
# strategie is controled by the "after-sb-1pri" options.
# "disconnect" ... always disconnect
# "consensus" ... discard the version of the secondary if the outcome
# of the "after-sb-0pri" algorithm would also destroy
# the current secondary's data. Otherwise disconnect.
# "discard-secondary"
# discard the version of the secondary.
# "panic-primary" Always honour the outcome of the "after-sb-0pri"
# algorithm. In case it decides the the current
# secondary has the right data, it panics the
# current primary.
# "suspend-primary" ???
after-sb-1pri disconnect;
# In case both nodes are primary you control DRBD's strategy by
# the "after-sb-2pri" option.
# "disconnect" ... Go to StandAlone mode on both sides.
# "panic" ... Honor the outcome of the "after-sb-0pri" algorithm
# and panic the other node.
after-sb-2pri disconnect;
vamos ver se da resultado. eu aviso 
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