Re: [CentOS] DRBD very slow....

On Wed, 2009-07-22 at 11:16 +0200, Coert Waagmeester wrote:

The highest speed I can get through that link with drbd is 11 MB/sec (megabytes)

Not good...

But if I copy a 1 gig file over that link I get 110 MB/sec.

That tells me that the network connection is fine. The issue is at a higher layer...

Why is DRBD so slow?

Let's see...

common { protocol C; syncer { rate 80M; } net { allow-two-primaries; } }

You want allow-two-primaries? That implies that you're using something like ocfs2, but that's probably immaterial to the discussion... Here's a question - do you have another syncer statement in the resource definition that's set to a lower number? That would definitely throttle the sync rate...

-I