[DRBD-user] MySQL-over-DRBD Performance

Matteo Tescione matteo at rmnet.it
Thu Dec 20 03:16:50 CET 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Sorry if already asked, but are you using hardware raid or software raid? If
so, is it raid 5/6 ? I discovered an huge hole in performance like your
reports using that kind of setup. Search in the list for previous posts
about performance solved.


#Matteo Tescione
#RMnet srl

Il 20-12-2007 1:41, "Art Age Software" <artagesw at gmail.com> ha scritto:

> 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
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