[DRBD-user] DRBD syncer rate more than specified in drbd.conf?

Lars Ellenberg lars.ellenberg at linbit.com
Mon May 25 09:51:55 CEST 2009

Note: "permalinks" may not be as permanent as we would like,
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On Fri, May 22, 2009 at 04:00:47PM -0700, Alireza Nematollahi wrote:
> Hi guys,
> I have specified 30M to be my syncer rate in drbd.conf file but when I  
> do cat /proc/drbd, I get this:
> 0: cs:SyncSource st:Primary/Secondary ds:UpToDate/Inconsistent C r---
>    ns:13008216 nr:0 dw:17701660 dr:10605873 al:1808 bm:2682 lo:52 pe:18  
> ua:69 ap:0 oos:10368640
>        [>....................] sync'ed:  1.2% (10125/10239)M
>        finish: 0:04:25 speed: 39,016 (39,016) K/sec

There are two possible ways for an out-of-sync region to become in-sync
again: application WRITE (gets replicated right away, so will be in sync
on both replicas once completed) or resync writes.

The sync rate as set in the drbd configuration only throttles the
bandwidth the resyncer is allowed to use up.

The resync progress indicator in /proc/drbd also takes those blocks into
account that have been "resynced" by application writes.  And, it is a
rought guess only, anyways.

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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