[DRBD-user] ProtocollError using on-congestion pull-ahead

Pascal BERTON pascal.berton3 at free.fr
Sat Feb 9 15:19:22 CET 2013

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


This one has been of great help to me facing very odd errors over 10Gb
replication links. It's been 80% of the resolution of my problems. 



-----Message d'origine-----
De : drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] De la part de Felix Frank
Envoyé : vendredi 8 février 2013 10:08
À : Holger Steinhaus
Cc : drbd-user at lists.linbit.com
Objet : Re: [DRBD-user] ProtocollError using on-congestion pull-ahead


On 02/07/2013 08:58 PM, Holger Steinhaus wrote:
>         resync-rate 200M;

Uhm, what? That's more than your link can do. You want to max this at 30% of
your maximum throughput, tops. Otherwise the resync may interfere with
on-line write performance.

>         al-extents 389;

Why? This should be chosen to be as large (a prime number) as possible.

Have you looked through

It can also make sense to tune the tcp buffers on OS level (i.e.
sysctl). I can't find any good docs about that ad hoc, though.

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