Neither is ext3. Nor ext4. Nor btrfs. And thus, none of these will work on dual-Primary DRBD. Nor active-active shared storage. Nor any synchronously replicated active-active SAN. And we’re telling you very clearly.
So if you choose to ignore all warnings and put ReiserFS on dual-Primary DRBD, and mount it from two nodes, you’ve just signed up for wrecking your data. And when that happens, don’t come whining. And don’t blame DRBD or any other of the technologies you may be choosing to employ while ignoring the documentation.
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