Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
I have run some additional tests: 1) Disabled bonding on the network interfaces (both nodes). No significant change. 2) Changed the DRBD communication interface. Was using a direct crossover connection between the on-board NICs of the servers. I switched to Intel Gigabit NIC cards in both machines, connecting through a Gigabit switch. No significant change. 3) Ran a file copy from node1 to node2 via scp. Even with the additional overhead of scp, I get a solid 65 MB/sec. throughput. So, at this stage I have seemingly ruled out: 1) Slow IO subsystem (both machines measured and check out fine). 2) Bonding driver (additional latency) 3) On-board NICs (hardware/firmware problem) 4) Network copy speed. What's left? I'm stumped as to why DRBD can only do about 3.5 BM/sec. on this very fast hardware. Sam