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

Whit Blauvelt whit+drbd at transpect.com
Wed Mar 12 17:03:25 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.

That's reassuring! I haven't set the syncer rate at all. I followed the
draft manual advice at www.drbd.org/users-guide/s-configure-resource.html,
so my drbd.conf has no more in it that your "Example configuration" there.
Maybe that's not a very useful example? 

The sequence in the manual goes through doing the initial sync at
www.drbd.org/users-guide/s-initial-full-sync.html without any reference to
setting the syncer rate. It might improve the manual to advise reference to
www.drbd.org/users-guide/s-configure-syncer-rate.html before starting the
initial sync - or else have DRBD run with a more realistic default syncer
rate when its not specified.

Some people read a whole manual closely before doing anything. Others of us
assume that for a simple setup, following the steps as they're given should
produce a usable first approximation. Since the manual's a draft, hopefully
it can still be made better for the second sort of user.

I'll reset the syncer rate. Thanks.


On Wed, Mar 12, 2008 at 04:30:15PM +0100, Stefan Seifert wrote:
> On Wednesday, 12. March 2008, Whit Blauvelt wrote:
> > Here's an additional question the manual might answer: Are the subsequent
> > operations as slow as the initial sync? Or do they runs at something closer
> > to normal file transfer speed? In our case what I'm trying to test it for
> > is a 60 gig partition. It's been running the initial sync for a day, and
> > looks to have another day to go.
> That's completely out of the ordinary. DRBD sync should be more like raw disk 
> throughput (50MB/s in our case). Are you sure, you set the syncer rate 
> in /etc/drbd.conf to something reasonable like "rate 100M;"? If yes, there's 
> something fishy going on and standard infos, like hard- and software 
> configuration may needed to find out, what's wrong.
> Regards,
> Stefan Seifert
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