Drbd is a block device which is designed to build high-availability clusters. This is done by mirroring a whole block device via a (dedicated) network. You could see it as a network raid 1.
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New configurable resync speed controls, support for BIO sizes of up to 128 KB, a new on-no-data-accessible configuration keyword, OCF RA compatibility with Pacemaker 1.1, and various bugfixes.
Various bugfixes and improvements, a new "check-offline" command to detect offline resize and relocate meta-data accordingly, a new "initial-split-brain" handler for better notification, a new "--assume-clean" resize option that skips synchronization of new space after resize, and improvements in resync for WAN/proxy connections.
RPM packaging was added. Autoconf fixes and various bugfixes were done. New features include online resizing of disconnected devices, ordered resyncing of multiple stacked resources, and new configuration layout.
With the non-blocking I/O hints, a bug was introduced that could lead to partially sent I/O hints, resulting in loss of connection. This issue is fixed now. There is a fix to the range check of the nice value in drbdsetup, and there are updates to the build system (Makefile and Makefile.SuSE-9.0).
