[DRBD-user] Protocol A vs Protocol C performance issue?

Joeri Casteels joeri.casteels at intec.ugent.be
Tue Oct 20 18:25:14 CEST 2015

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

> On 20 Oct 2015, at 17:47, Lionel Sausin <ls at numerigraphe.com> wrote:
> Le 20/10/2015 17:30, Joeri Casteels a écrit :
>>> Protocol A an async, C is sync. So you're probably hitting the network
>>> limit on C.
>> I don’t think so since it has a direct 20G trunk in-between with perf i get 19.6Gbit/s on single threat. With A (async when i monitor the network it also hits 2x the network speed as C does)
> "sync" means the round-trip time (down to the remote disks) is what counts, not the bandwidth.
So what causes the 1/2 difference then if i read on forum’s most people don’t even see a speed difference between protocol A and C… btw both’s primary and slave node are identical hardware wise so it’s not that the disks are the limiting factor.

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