[DRBD-user] Suggestion for DRBD User's Guide

Whit Blauvelt whit+drbd at transpect.com
Wed Mar 12 17:17:54 CET 2008

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

On Wed, Mar 12, 2008 at 03:38:34PM +0000, drbd at bobich.net wrote:

> What version of DRBD are you using? What does drbd.conf say? Have you 
> verified latency and throughput on your Gb interfaces independently of 
> DRBD? Have you verified idle sync speed with no other operations happening 
> on the DRBD devices (without them being mounted)? What does /proc/drbd say 
> it's speed is? What distro are you using? Did you compile from source or 
> get the rpms from a repository?

Ah yes, versions. This is on Ubuntu 7.10, which is only up to 8.0.3. It's
from the deb except for the kernel module, which is compiled from a source
deb. The interfaces are fine. Using drbdsetup to up the syncer rate looks to
have just sped the process, although what /proc/drbd shows for speed - well,
it looks like that's an average over time, so it's still quite low but
rising. The DRBD devices aren't currently mounted.

> No, I've tested it with devices/volumes up to hundreds of GB. One thing 
> that did cause me problems is an upgrade from 8.0.8 to 8.0.11+, though. The 
> performance went through the floor, probably to similar levels that you are 
> seeing. I'm back to 8.0.8 and it's all working happily again. What version 
> of DRBD are you running? Try downgrading to 8.0.8 (including the kernel 
> module) and see if the problem goes away.

Thanks for the reassuring report. Is 8.0.8 golden, then? Or is it just that
I should not have followed the draft manual's example of not setting a
syncer rate before the initial sync?


More information about the drbd-user mailing list