[DRBD-user] DRBD won't take 1G syncer rate

Dan Barker dbarker at visioncomm.net
Fri Aug 5 16:51:03 CEST 2011

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

You are still mixing megabits and megabytes. Your 1000 megabit pipe won't
take a 600 megabyte stream, or a 150 megabyte stream. The maximum is about
125 MBps.


DRBD talks (and is documented to talk) bytes. Most everyone else talks bits.


You don't mention the speed you are getting.


Also, if you have 3 resources syncing, each will try for the syncer limit.
So, to use 50% of your capacity to sync 3 resources, you'd specify the rate
as 21M. Note: you can change the rate on the fly, during a sync.




From: drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Matt Baer
Sent: Friday, August 05, 2011 8:51 AM
To: Caspar Smit
Cc: drbd-user at lists.linbit.com
Subject: Re: [DRBD-user] DRBD won't take 1G syncer rate


I was playing with the settings yesterday and it let me set it at 600M and
it didn't make a difference in the sync speed at all.  I then tried it with
your suggestion, dropped it to 150M just to be safe.  Still no difference.
I wonder what the deal is.  Could it be that this is the initial sync?


On Aug 5, 2011 1:29 AM, "Caspar Smit" <c.smit at truebit.nl> wrote:
> Hi Matt,
> 1000M means 1000 Mb/s NOT 1000mbps. To reach 1000M you should have at
> one (probably two) 10gbit interface(s). Since you have two 1gbit
> (bonded with balance-rr?) a value between 100M and around 170M would be
> appropiate.
> Kind regards,
> Caspar
> Op 5 aug. 2011 08:21 schreef "Matt Baer" <mbaer at lrnet1.com> het volgende:
>> When setting the syncer rate in drbd.conf to 1G, it won't start, citing
> that
>> 1G is invalid. Get the same thing with 1000M. Any clue as to why? It
>> explicitly states that <mbaer at lrnet1.com>1G is acceptable in the docs.
> I've
>> triple checked and both interfaces are auto-negotiated at 1000mbps full
>> duplex.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20110805/da5d90dd/attachment.htm>

More information about the drbd-user mailing list