[DRBD-user] performance issues with DRBD :(

Jakov Sosic jakov.sosic at srce.hr
Thu Dec 10 12:25:48 CET 2009

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

On Thu, 2009-12-10 at 09:10 +0100, Florian Haas wrote:

> You have round robin over 4 links that you replicate DRBD over? TCP
> reordering is definitely going to kill you. This is expected to have
> lower throughput that a single non-bonded link.
> Remove that bonding configuration. Then re-run your tests.

But does it explain why is always secondary under heavy IO, while the
primary never reaches more than ~10% ? And both servers are same...

Also when DRBD is disconnected, I get twice the performance out of
bonnie++ in domU over iSCSI. No evident performance differences between
A, B or C protocols...

|    Jakov Sosic    |    ICQ: 28410271    |   PGP: 0x965CAE2D   |
|                                                               |

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