Linux: DRBD, The Distributed Replicated Block Service
Lars Ellenberg started an effort to get DRBD, the Distributed Replicated Block Service merged into the Linux kernel. When asked for clarification as to what it was, Lars explained, "think of it as RAID1 over TCP. Typically you have one Node in Primary, the other as Secondary, replication target only. But you can also have both Active, for use with a cluster file system." Earlier in the thread he described it as "a stacked block device driver".
Much of the initial review focused on the need to comply with kernel coding style guidelines. Kyle Moffett offered a much lengthier review, noting at one point in the code,
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