DRBD is an established building block for MySQL high availability database clusters. It has been included in the MySQL Enterprise offering since 2007. DRBD provides transaction-safe, synchronous, shared nothing block-level replication—and as such, has one drawback: it introduces additional write latency. With traditional IP/Ethernet-based replication, in the past this made DRBD a less than optimal choice for database environments with high write loads, or those with requirements for very low write latency.
Recent DRBD versions introduced support for Dolphin Express interconnects as a replication transport for DRBD. By using low-latency Dolphin Express interconnects, DRBD can now leverage highly efficient Dolphin SuperSockets as its replication transport, dramatically cutting down on write latency.
With DRBD 8.3, MySQL on DRBD now also supports fully transaction-safe, synchronous storage replication across up to four nodes.
In this session,
- Dolphin Express and Dolphin SuperSockets
- The Heartbeat cluster framework and the Pacemaker cluster resource manager.
About DRBD: DRBD, the Distributed Replicated Block Device, is an open source shared-nothing storage replication technology integrated with MySQL Enterprise. MySQL customers using DRBD include booking.com, Europe’s largest on-line reservation agency, the New York Times, and MTV Japan.
Joachim Worringen is a software architect at Dolphin Interconnect Solutions, specializing in driver development, communication protocols and performance analysis, and part of the DRBD for Dolphin Express integration team. Being a part of Dolphin since 2006, Joachim has specialized in network research and engineering for over six years.
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