[DRBD-user] switching to Protocol C

Felix Frank ff at mpexnet.de
Mon Jan 31 09:19:53 CET 2011

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

On 01/31/2011 07:12 AM, Muhammad Sharfuddin wrote:
> OS: SLES11 SP1 x86
> SLE HAE 11 SP1
> DRBD version: 8.3.7
> /dev/drbd0 is an oracle file system(/opt/oracle)
> We are having serious performance issues when using DRBD over a very
> slow but a very reliable WAN link(2.5 Mbps).
> As of now we are using Protocol C, and now we are considering to use
> Protocol A.
> Anyone please suggest/recommend/comments

Are you facing latency issues? Whats the RTT on this link?

You should perform this test:
and compare the result to disconnected operation.
If you measure a large difference, protocol A can probably help your issues.

If you are bandwidth-limited, you will need DRBD proxy.


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