Avaya Aura System Platform Installing And Configuring page 98

How System Platform High Availability Failover works
Data changes during disconnection
In case of the replication link interruption, DRBD uses its own metadata to keep the history of modified
data blocks since the connection break up. Later when the connection is reestablished, the missing data
blocks are synchronized on the standby node in parallel with the online changes propagation. The
following image depicts the data changes history marked in the DRBD metadata during the propagation
link disconnection:
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98 Installing and Configuring Avaya Aura System Platform April 2010