DRBD:Roadmap

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DRBD-8.3

New metadata layout, designed for the upcomming hard disk drives with a sector size of 4K
Support BIOs bigger than 32K
Support for devices bigger than 16TByte (64 bit achitectures only)
Introducing mechanisms to better deal with temporary network failures for devices in primary-primary mode
Grouping devices into volume groups that obey write ordering and share a single connection

DRBD-9

More than two primary nodes, better integration with device mapper, and new methods of data logging, are topics that will be addressed in the new upcoming development branch. We will publish more when we know more.